Test "Strength" 7th grade.

Option I

1. In what units is gravity measured in the SI system?

2. What formula is used to find the elastic force?

A) heaviness

B) elasticity,

B) friction

D) body weight

4. What is the force of gravity acting on a body weighing 10 kg?

F 1 = 3 H F 2 = 7 H

6. What device is used to measure gravity?

7. What is the stiffness of the spring if, with a force of 50 N, it lengthens by 5 cm?

A) 10 N/kg B) 250 N/kg C) 0.1 N/kg D) 1000 N/kg

8. What is the mass of a body if a force of gravity equal to 100 N acts on it?

Test "Strength" 7th grade.

Option II

1. In what units is elastic force measured in the SI system?

A) kilogram, B) meter, C) second, D) Newton

2. What formula should be used to find the force of gravity?

A) F = mg, B) F = k ∆ l, C) F = pS, D) p = F:S

3. What force is shown in the figure?

A) heaviness

B) elasticity,

B) friction

D) body weight

4. What is the force of gravity acting on a body weighing 1 kg?

A) 10 N B) 100 N C) 0 N D) 0.1 N

5. What is the resultant of the two forces acting on the body (shown in the figure)?

F 1 = 3 H F 2 = 7 H

6. What device is used to measure elastic force?

A) scales, B) stopwatch, C) dynamometer, D) tape measure

7. How much does a spring with a stiffness of 50 N/kg elongate if a force of 5 N acts on it?

A) 10 m B) 250 m C) 0.1 m D) 55 m

8. What is the mass of a body if a force of gravity equal to 10 N acts on it?

A) 10 kg B) 100 kg C) 1 kg D) 0.1 kg

9. Which test question was the most difficult for you?

A) 1 B) 2 C) 3 D) 4 E) 5 F) 6 G) 7 H) 8

Physics test Forces 7th grade with answers. The test includes 3 options. Each option has 6 tasks.

Option 1

1. During the interaction of two bodies, they...

1) both shape and speed can change
2) neither speed nor shape changes
3) only the shape changes
4) only the speeds change

2. The result of the force depends...

1) only on the modulus of this force
2) only on the direction of this force
3) only from the point of application of this force
4) both from the module, and from the direction, and from the point of application of force

3. The modulus of the elastic force of the stretched rope (k is the rigidity of the rope), shown in the right figure, is equal to ....

1) kl
2) kl 0
3) k(l − l 0)
4) k(l + l 0)

4. Gravity is the force with which...

1) The earth attracts the body to itself
2) the body attracts the Earth to itself
3) the body is attracted to the mass standard
4) the body presses on the scales

5. The value of the sliding friction force depends….

1) only from the material of the contacting bodies
2) only on the degree of their processing (roughness)
3) only from the force pressing one body to the surface of another
4) from all the above factors

6. The force exerted by the finger on the orange and the resultant force applied to this orange are respectively equal to....

1) 4 N and 1 N
2) 1 N and 0 N
3) 4 N and 0 N
4) 1 N and 4 N

Option 2

1. A body that is affected by another body may change....

1) only numerical speed value
2) only the direction of speed
3) only form
4) both the numerical value of the speed, and its direction, and shape

2. Change in the velocity vector of a body when a force acts on it....

1) depends only on the modulus of this force
2) depends only on the direction of this force
3) depends on both the modulus of the force and its direction
4) does not depend either on the modulus of the force or on its direction

3. The elastic modulus of the compressed spring (k is the spring stiffness), shown in the right figure, is equal to ....

1) kl
2) kl 0
3) k(l − l 0)
4) k(l + l 0)

4. The magnitude of the force of gravity acting on a body depends...

only by body weight
only on the height at which the body is located
only on the geographical latitude of the point at which the body is located
from all the above factors

5. The friction force is measured when a metal block moves over a plate of the same material, gradually polishing both contacting surfaces. As the block and plate become smoother, the frictional force will be....

1) constantly decrease
2) constantly increase
3) remain unchanged
4) first decrease, then increase

6. The force acting on the eggplant from the finger and the resultant force applied to this eggplant are respectively equal to ....

5 N and 0 N
5 N and 2 N
3 N and 0 N
3 N and 5 N

Option 3

1. A body influencing another body...

1) can change its speed, but cannot change its shape
2) can change both its speed and its shape
3) can change its shape, but cannot change its speed
4) cannot change either its speed or its shape

2. First, a force was applied to the center of the rod lying on the table. Then a force of the same magnitude and direction was applied to the end of the rod, and the nature of the movement of the rod was ....

1) will not change, since in both cases the forces are equal in magnitude
2) will not change, since in both cases the forces are equally directed
3) will change, since the point of application of force in these two cases is different
4) may remain the same, or may change, since the force can be directed both along the rod and at an angle to it

3. If l 0 is the length of the unstretched spring, and l is the stretched one, k is the stiffness of the spring, then the modulus of the elastic force of the stretched spring is equal to ....

1) kl
2) kl 0
3) k(l − l 0)
4) k(l + l 0)

4. On which bodies (a house, the Moon, a leaf falling from a tree) does gravity act constantly?

only to home
only to the moon
only on a leaf falling from a tree
for all the bodies listed above

5. The reason for the frictional force between two bodies….

1) associated only with the mutual repulsion of molecules located on the surface of bodies
2) is associated only with the mutual attraction of molecules located at the points of contact between bodies
3) is associated with both attraction and repulsion of molecules located at the points of contact between bodies
4) not related to the interaction of molecules of contacting bodies

6. The distance between the nearest divisions of the spring scales shown in the figure is 1 cm. The spring stiffness of the dynamometer is approximately equal to ....

1) 1000 N/m
2) 500 N/m
3) 140 N/m
4) 10 N/m

Answers to the physics test Forces 7th grade
Option 1
1-1
2-4
3-3
4-1
5-4
6-2
Option 2
1-4
2-3
3-3
4-4
5-4
6-3
Option 3
1-2
2-4
3-3
4-4
5-3
6-1

Option 1.

1. Under the influence of what force does the direction of movement of a stone thrown horizontally change?
a) elastic forces; b) gravity; c) body weight.

2. What is approximately the force of gravity acting on a ball weighing 0.5 kg?
a) 5 N; b) 0.5 N; c) 50 N.

3. What is the approximate mass of a body weighing 120 N?

a) 120 kg; b) 12 kg; c) 60 kg.

4. The force resulting from the deformation of a body and directed in the direction opposite to the movement of particles of the body is called ...

a) elastic force; b) friction force; c) gravity.

5. A person whose mass is 80 kg holds a bag weighing 10 kg on his shoulders. With what force does a person press on the ground?

a) 800 N; b) 700 N; c) 900 N.

6. The thrust force of a rocket launching vertically upward is 400 kN, and the force of gravity acting on the rocket is 100 kN. Determine the resultant of these forces.

a) 400 kN; b) 500 kN; c) 300 kN.

7. In icy conditions, the sidewalks are sprinkled with sand, and the friction force of the soles on the ice...

a) decreases; b) increases; c) does not change.

8. A skydiver weighing 85 kg descends uniformly with an open parachute. What is the force of air resistance if the parachutist moved uniformly?

a) 85 N; b) 850 N; c) 8.5 N.

9. There is water in the tank of the street watering machine. How much will the weight of the car decrease if it spills 200 kg of water?

a) by 200 N; b) by 2 kN; c) by 20 kN. 1 2 3

10. (creative) Give examples where friction can be harmful. What ways do you know to reduce friction?

Physics test in 7th grade on the topic “Forces”

Option 2

1. What force causes the formation of rockfalls in the mountains?

a) elastic forces; b) gravity; c) friction force.

2.. What is approximately the force of gravity acting on a brick weighing 3 kg?
a) 3 N; b) 0.3 N; c) 30 N.

3. What is the approximate mass of a chandelier suspended from the ceiling, acting on the ceiling with a force of 50 N?

a) 50 kg; b) 4 kg; c) 5 kg.

4. The force with which a body, due to attraction to the Earth, acts on a support or suspension

a) elastic force; b) gravity; c) body weight.

5. A boy weighing 400 N holds a weight of 10 kg on his outstretched arm. Determine the force with which it presses on the ground.

a) 500 N; b) 400N; c) 300 N.

6. An electric locomotive pulls cars with a force of 300 kN. The resistance force is 170 kN. Calculate the resultant of these forces.

a) 470 kN; b) 130 kN; c) 300 kN.

7. When lubricating rubbing surfaces, the friction force...

a) does not change; b) increases; c) decreases.

8. A load weighing 400 g was suspended from a spring. What is the elastic force generated in it?

a) 4 N; b) 0.4 N; c) equal to zero.

9. There is cargo in the car. How much will the weight decrease if 500 kg of cargo is unloaded?

a) at 500 N; b) by 5 kN; c) by 50 kN.

10. (creative) Give examples where friction can be beneficial. What ways to increase friction do you know?

Physics test of Forces for 7th grade students with answers. The test consists of 4 options, each option has 20 tasks.

1 option

1. What phenomenon happens to a rubber band when, taking it by the ends, you spread your arms to the sides?

1) Compressive deformation
2) Torsional deformation
3) Tensile strain
4) Bending deformation

2. When is it said that a force acts on a body?

1) When a person acts on the body
2) When the body is driven by the engine
3) In the case of the action of the same body on it
4) When any interaction of a body with other bodies occurs

3. Gravity is called universal because

1) all bodies in the world attract each other
2) all planets of the solar system are attracted to each other
3) The sun attracts all the planets to itself

4. How does the gravity of bodies depend on their mass?

1) Doesn't depend
2) The greater the mass of bodies, the less their attraction to each other
3) The more mass of bodies, the stronger their attraction
4) There is no right answer here

5.

1) the body attracts the Earth
2) the body is attracted by the Earth
3) the body is attracted by the Sun
4) the body interacts with other bodies

6. Where will the force of gravity acting on bodies be greater - at the pole or at the equator?

1) At the equator
2) At the pole
3) She is the same

7. What phenomenon causes the elastic force to appear?

1) Attraction of bodies by the Earth
2) Universal gravity
3) Inertia
4) Deformation

8. What formula expresses Hooke's law?

1) F = gm
2) m = ρV
3) F = kΔl
4) P = F strand

9. For which of the deformations indicated here does Hooke's law apply?

1) A piece of lead is flattened by a hammer blow
2) Under the weight of a suspended load, the spring stretched, but when the load was removed, it did not compress to its previous state
3) The spring was compressed and then released, and it returned to its original state
4) When driving a nail, it bent

10. What force is called weight?

1) With which the body acts on the support or suspension
2) With which the body is attracted to the Earth
3) With which the support acts on the body located on it

11. In which of the pictures is the letter F does it mean body weight?

1) №1
2) №3
3) №2
4) There is no such picture

12. What physical quantity is measured in newtons?

1) Density of matter
2) Strength
3) Body weight
4) Its volume

13. Calculate the force of gravity acting on a box of mass 20 kg.

1) 2 N
2) 20 N
3) 200 N
4) 100 N

14. Determine the weight of the cylinder from the figure given.

1) 120 N
2) 102 N
3) 98 N
4) 125 N

15. The dynamometer shown in the figure shows the weight of the cylinder equal to

1) 0.5 N
2) 9 N
3) 8.5 N
4) 9.5 N

16. The forces acting on the stone are shown in the figure. What is their resultant force?

1) 8 N
2) 9 N
3) 25 N
4) 2 N

17. Find the resultant force.

1) 4 N
2) 8 N
3) 12 N
4) 24 N

18. What force stops a sled rolling down a hill?

1) Gravity
2) Weight
3) Friction force
4) Elastic force

19. What type of friction produces the least frictional force?

1) Static friction
2) Rolling friction
3) Sliding friction
4) The friction force is always the same

20. Surface lubrication

1) increases friction force
2) eliminates friction
3) does not change the friction force
4) reduces friction force

Option 2

1. A man presses on an air mattress. What phenomenon occurs in this case?

1) Tensile strain
2) Compressive deformation
3) Torsional deformation
4) Bending deformation

2. The word "strength" means that

1) a body interacts with another moving body
2) the same body acts on the body
3) any interaction of the body with other bodies occurs
4) other bodies act on the body

3. Gravity is called universal because

1) all bodies are attracted to the Earth
2) all bodies attract each other
3) all planets are attracted to the Sun
4) all planets are attracted to each other

4. How does the attraction of bodies depend on the distance between them?

1) Doesn't depend
2) The greater the distance, the weaker the attraction
3) The shorter the distance, the weaker the attraction

5.

1) The earth attracts all bodies
2) The sun attracts the Earth

4) stars attract the Sun

6. Should a person or a ship experience greater gravity?

1 person
2) Ship
3) Gravity forces will be the same
4) None of the answers is correct

7. At what point does the elastic force become zero?

1) When the deformation disappears
2) When the deformation of the body is maximum
3) When the body begins to deform
4) When it begins to regain its shape and size

8. The elastic force according to Hooke's law is equal to

1) F control = F cord
2) s = vt
3) m = ρV
4) F = kΔl

9. Which deformations are elastic?

1) Very small
2) Very large
3) Those in which the body, after removing the load, returns to its original dimensions and shape
4) Those in which the body does not collapse

10. Weight is the force with which

1) the body is attracted to the Earth
2) the body, being attracted to the Earth, acts on a support or suspension
3) the deformed support acts on the body
4) there is no correct answer

11. In which of the pictures is the letter F denotes the force of gravity acting on a body?

1) №1
2) №2
3) №3
4) there is no such picture

12. Newton is a unit of measurement

1) masses
2) density
3) surface area
4) strength

13. Determine the force of gravity acting on a body whose mass is 500 g.

1) 0.5 N
2) 5 N
3) 50 N
4) 500 N

14. Find out from the dynamometer shown here how much force is applied to the block to move it.

1) 3 N
2) 2 N
3) 1.5 N
4) 2.5 N

15. What weight of the load does the dynamometer shown in the figure indicate?

1) 70 N
2) 10 N
3) 20N
4) 15 N

16. A box placed on a shelf is subjected to a gravitational force of 60 N and an elastic force from the shelf. What is their resultant force?

1) 60 N
2) 120 N
3) 0 N
4) It is impossible to answer, since the modulus of elastic force is not indicated

17. A 1 kg bag of sugar lying on the table was topped with the same bag. What is the resultant force with which these bags act on the table?

1) 20 N
2) 2 N
3) 10H
4) 15 N

18. What causes a ball rolling on the ground to stop?

1) Earth's gravity
2) Inertia
3) Deformation
4) Friction

19. Which of the drawings with images of moving bodies shows the manifestation of static friction?

1) №1
2) №2
3) №3
4) There is no such picture

20. Leveling the surfaces of contacting bodies

1) reduces friction
2) increases it
3) eliminates friction
4) doesn't change it

Option 3

1. What phenomenon happens to metal under pressure?

1) Compressive deformation
2) Torsional deformation
3) Tensile strain
4) Bending deformation

2. They say that a force acts on a body when

1) it interacts with a body of the same mass
2) the body is not affected by other bodies
3) the body participates in any interaction with other bodies
4) the body is deformed

3. Universal gravity is

1) attraction of all bodies to the Earth
2) the attraction of all planets to each other
3) the attraction of all celestial bodies to each other
4) mutual attraction of all bodies of the Universe

4. The distance between the bodies has decreased. How did their attraction to each other change?

1) Remains the same
2) Increased
3) Decreased
4) First it increased, then it decreased

5. Gravity is the force with which

1) all bodies are attracted by the earth
2) The sun attracts the Earth to itself
3) The sun attracts planets
4) all bodies in the world attract each other

6. Which climber will be affected by greater gravity: a) the one who begins the climb, or b) the one who has already reached the top?

1) a
2) b
3) There will be no difference in gravity
4) None of the answers is correct

7. At what point does the elastic force reach its maximum value?

1) When the body begins to deform
2) When the deformation becomes greatest
3) When the body restores its volume and shape
4) When the deformation disappears

8. According to Hooke's law, the elastic force is calculated by the formula

1) F=gm
2) s = v av t
3) Fstrand = P
4) F = kΔl

9. In which of the following cases can Hooke's law not be applied?

1) A child’s ball jumps up and down on an elastic band
2) A child pulls a multi-colored flexible toy spring
3) After removing the load, the spring coils remained stretched
4) Such a case is not mentioned here

10. Why don't gravity and weight cancel each other out?

1) Because they are not equal
2) Because they act in one direction
3) Because they are applied to different bodies
4) There is no correct answer

11. Which picture is the letter in? F stands for elastic force?

1) №1
2) №2
3) №3
4) There is no such picture

12.

1) Kilograms (kg)
2) Kilometers (km)
3) Meters (m)
4) Newtons (N)

13. Determine the force of gravity acting on a canister weighing 8 kg.

1) 0.8 N
2) 8 N
3) 80 N
4) 800 N

14. Using the readings of the dynamometer shown in the figure, find out what force of gravity acts on the disk.

1) 18 N
2) 15.5 N
3) 16 N
4) 20 N

15. What is your body weight?

1) 40 N
2) 50 N
3) 45 N
4) 41 N

16. The brick is lifted by applying a force of 15 N. The force of gravity acting on it is 10 N. What is the resultant of these forces?

1) 25 N
2) 5 N
3) 50 N
4) 250 N

17. The ball is acted upon by two forces shown in the figure: F 2= 60 N and F 1= 20 N. What is their resultant force?

1) 40 N
2) 60 N
3) 120 N
4) 80 N

18. What force stops a car when the engine is turned off?

1) Weight
2) Gravity
3) Friction force

19. What type of friction produces the greatest frictional force?

1) Sliding friction
2) Rolling friction
3) Static friction
4) These friction forces are approximately the same

20. Balls roll along the surface of the table, subject to gravity forces equal to: a) 0.1 N; b) 0.3 N; c) 0.5 N. Which of them is subject to the least frictional force?

1) a
2) b
3) in
4) The friction forces in these cases are the same

Option 4

1. Thin wires are twisted into a bundle. What phenomenon happens to them in this case?

1) Bending deformation
2) Tensile strain
3) Compressive deformation
4) Torsional deformation

2. The term "power" is used to briefly indicate that

1) any other body acts on the body
2) no other bodies act on it
3) when interacting with other bodies it moves
4) as a result of interaction with surrounding bodies, it stops

3. Universal gravity is the attraction of bodies towards each other. It depends on

1) body mass
2) distances between them
3) speed of bodies
4) on the distance between bodies and their masses

4. In which case will the attraction of bodies be greater: a) when two ships with cargo sail past each other, or b) when boats with rowers are at the same distance?

1) a
2) b
3) It will be the same

5. Gravity is the force with which

1) the body acts on the support
2) The earth attracts the body
3) other bodies attract this body
4) the body attracts other bodies

6. Where will the ship be affected by greater gravity - at the pole or at the equator?

1) At the pole
2) At the equator
3) This force is the same everywhere

7. Under what condition are the moduli of gravity and elasticity equal?

1) When the deformation is small
2) With increasing strain
3) When the deformation and with it the elastic force increase so much that the elastic force balances the force of gravity
4) When the load causing deformation decreases

8. To determine the elastic force, we must use Hooke's law. It is expressed by the formula:

1) F control = F tension
2) P = F strand
3) F = gm
4) F = kΔl

9. What deformations are called elastic?

1) Those in which the body is destroyed
2) Those after which the body returns to its original size and shape
3) Which cause a permanent change in body shape
4) Which cause a change in body volume that does not disappear over time

10. How does weight depend on body weight?

1) The greater the body weight, the greater the weight
2) The less body weight, the more weight
3) Weight does not depend on body weight
4) None of the answers is correct

11. Which picture is the letter in? F does it mean weight?

1) №1
2) №2
3) №3
4) There is no such picture

12. In what units is force measured?

1) Kilograms and grams
2) Meters and kilometers
3) Newtons and kilonewtons
4) There is no correct answer

13. Find the force of gravity acting on a vase of flowers if its mass is 1.5 kg.

1) 1.5 N
2) 15 N
3) 150 N
4) 1500 N

14. Using the dynamometer shown in the figure, determine the weight of the block

1) 1.6 N
2) 14 N
3) 160 N
4) 1600 N

15. 20 kg of granulated sugar was added to the bag. How did the weight of the bag change?

1) Increased by 20 N
2) Increased by 10 N
3) Increased by 200 N
4) Has not changed

16. Forces act on the box F 1= 45 N and F 2= 30 N shown in the figure. What is their resultant force?

1) 75 N
2) 50 N
3) 25 N
4) 15 N

17. Determine the resultant force F 1= 30 Ni F 2= 20 N acting on the cart.

1) 50 N
2) 30 N
3) 20 N
4) 10 N

18. What phenomenon causes the impossibility of vehicle movement due to inertia?

1) Universal gravity
2) Attraction to the Earth
3) Friction
4) The action of gravity and elasticity

19. What type of friction occurs when the trolley moves?

1) Sliding friction
2) Rolling friction
3) Static friction

20. In which of the following cases does friction increase?

1) Oil is dripped into the keyhole
2) Fill the rollers with water
3) Grooves are made on the sole of winter shoes
4) The sled runners are made smooth

Answers to the Force physics test
1 option
1-3
2-4
3-1
4-3
5-2
6-2
7-4
8-3
9-3
10-1
11-3
12-2
13-3
14-1
15-2
16-4
17-3
18-3
19-2
20-4
Option 2
1-4
2-3
3-2
4-2
5-1
6-2
7-1
8-4
9-3
10-2
11-3
12-4
13-2
14-4
15-4
16-3
17-1
18-4
19-4
20-1
Option 3
1-1
2-3
3-4
4-2
5-1
6-1
7-2
8-4
9-3
10-3
11-4
12-4
13-3
14-1
15-3
16-2
17-4
18-3
19-3
20-1
Option 4
1-4
2-1
3-4
4-1
5-2
6-1
7-3
8-4
9-2
10-1
11-3
12-3
13-2
14-2
15-3
16-4
17-1
18-3
19-2
20-3