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- 1. Multiple Choice
The symbol and unit for Impulse are
J and N/s
J and N s
F and N
W and N s
- 2. Multiple Choice
impulsive force is
the change in velocity
the rate of change in momentum
the change in acceleration
the rate of change in inertia
- 3. Multiple Choice
impulse is
the change in momentum
the rate of change in momentum
the rate of force acting
the change in inertia
- 4. Multiple Choice
a boy bending his knees when jumping down from a fence. the boy bends his knee so that the impact of the impulsive force on his leg will be
bigger
smaller
the same
- 5. Multiple Choice
which of the following will reduce impulsive force
increase in velocity
increase in mass
increase in time
increase in acceleration
- 6. Multiple Choice
which of the following causes increase in impulsive force?
a long jumper landing on a sandy pit
an airbag acting on a driver during an accident
a softball player wearing a thick and soft glove to catch a ball
a boy jumping down with straightened legs.
- 7. Multiple Choice
A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.
Calculate the impulse on the ball.
1 N·s
6 N·s
66 N·s
None of these
- 8. Multiple Choice
A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is ______ N·s.
-2.5
.
.
-10
-18
-45
- 9. Multiple Choice
Definition of impulse:
The time integral of net force that causes Change in momentum
The product of mass and velocity
The ability to do work
the rate of increase of speed or the rate of change of velocity
- 10. Multiple Choice
All of the following are examples of impulse except..
A car moving with constant speed
A tennis ball hitting a racket
A pencil getting stuck to the ceiling
A hammer bouncing of a nail
- 11. Multiple Choice
During a collision. an object experiences an impulse. How can this impulse be calculated?
Multiplying force by time
Multiplying mass by velocity
Dividing velocity by time
Multiplying mass by acceleration
- 12. Multiple Choice
During a collision. an object experiences an impulse. The impulse causes and is equal to the _____ of the object
energy change
kinetic energy change
force
momentum
momentum change
- 13. Multiple Choice
What is the function of mattress in a high jump competition?
To reduce the collision time between the athlete and the mattress
To reduce the change of momentum of the athlete when he hits the mattress
To reduce the impulsive force acting on the athlete when he hits the mattress
- 14. Multiple Choice
A softball player moves his hand backwards while catching a fast-moving ball. This movement of hand is to
increase the impulsive force
control the ball to stop it falling
lengthen the stopping time of the ball
- 15. Multiple Choice
An athlete of mass 50 kg falling on a mattress in a high jump competition. He hits the mattress at a velocity of 10 ms-1 an stop after 5.0 s.
-1000
1000
250
0
- 16. Multiple Choice
Which of the following is NOT true?
Follow through increase the velocity of the ball
Follow through increase the change of momentum
Follow through increase the impulsive force
Follow through increase the impulse
- 17. Multiple Choice
A boy landing with his knees bent in long jump category.
Why did the boy bend his knees?
To decrease momentum
To increase friction
To increase impact time
To increase impulse
- 18. Multiple Choice
A trolley of mass 0.4 kg hits a stone wall with a velocity 4 ms-1 and bounces back with a velocity of 3 ms-1. What is the magnitude of the impulse during collision.
0.6 Ns
1.2 Ns
1.6 Ns
2.8 Ns
- 19. Multiple Choice
A boy kicks a stationary ball of mass 0.15 kg. The ball moves forward at a velocity of 60 ms-1 and the time of impact between the boy’s foot and the ball is 5 ms. What is the impulsive force?
1.8 N
9 N
180 N
1800 N
- 20. Multiple Choice
Safety devices such and air bags and crumple zones protect passengers in a car by
increasing the stopping time so that force is decreased
decreasing the stopping time so that force in increase
reducing the change in momentum to zero
reducing the impulse
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