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Science
9th
grade
Third Law of Motion | Force and Laws of Motion | Assessment | English | Grade 9
7 questions
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- 1. Multiple Choice
Two children A with mass 70 kg and B with mass 50 kg collided with each other while running in the field. B will experience _____ acceleration and _____ force compared with that of A.
Less acceleration less force
More acceleration less force
Same acceleration same force
More acceleration same force
- 2. Multiple Choice
Which of the following is not an example of Newton's third law of motion?
A bird flying
A person climbing a mountain with the help of a rope.
A rocket taking off
An object at rest
- 3. Multiple Choice
A football player kicks the football with a force of 500 N. The amount of force exerted by football on the foot of the player is:
Force greater than 500 N
Force less than 500 N
500 N
None of the above
- 4. Multiple Choice
A boy of mass 40 kg starts from rest and kicks an object on the street with a velocity of 10 m/s. If the time taken by the boy is 5 s, what is the amount of force exerted by the boy on the ball?
80N
800N
-80 N
None of the above
- 5. Multiple Choice
A and B take part in arm wrestling contest. Force exerted by A is 120 N and force exerted by B is 80 N. How much force is exerted on B?
40N
120 N
200N
80 N
- 6. Multiple Choice
Newton's third law of motion involves a pair of equal and opposite forces. Why don't they cancel each other?
Because they act in the same direction.
Because they don't have same magnitude.
Because they act on different objects.
Because of the angle of application of forces.
- 7. Multiple Choice
A person of mass 50 kg is standing on a frictionless surface. What force should be applied when the person suddenly starts running at 10m/s for 10 seconds?
- 5 N
5 N
2 N
None of the above
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