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- 1. Multiple Choice
How do we define impulse?
A force that is applied at random.
A force that is applied very suddenly.
Force multiplied by the time of impact
The time interval that a force lasts.
- 2. Multiple Choice
The total momentum of a system is conserved
always
If no external forces act on the system.
If no internal forces act on the system.
Never; it’s just an approximation.
- 3. Multiple Choice
A mosquito and a truck have a head-on collision. Splat! Which has a larger change of momentum?
The mosquito
The truck
They have the same change of momentum.
Can’t say without knowing their initial velocities.
- 4. Multiple Choice
A mosquito and a truck have a head-on collision. Splat! Which has a larger impulse applied to it?
The mosquito
The truck
They have the same impulse.
Can’t say without knowing their initial velocities.
- 5. Multiple Choice
In order to catch a ball, a baseball player naturally moves their hand backward in the direction of the ball's motion once the ball contacts the hand. This habit causes the force of impact on the player's hand to be reduced in size mostly because _____
a resulting impact velocity has lessened
the momentum change is decreased
the time of impact is increased
the time of impact is decreased
none of the above
- 6. Multiple Choice
A light plastic cart and a heavy steel cart are both pushed with the same force for 1.0 s, starting from rest. After the force is removed, the momentum of the light plastic cart is ________ that of the heavy steel cart.
Greater than
Equal to
Less than
Can’t say. It depends on how big the force is.
- 7. Multiple Choice
What is the total change in the cart's momentum?
–20 kg m/s
–10 kg m/s
0 kg m/s
10 kg m/s
30 kg m/s
- 8. Multiple Choice
The two boxes are sliding along a frictionless surface. They collide and stick together. Afterward, the velocity of the
two boxes is
2 m/s to the left
1 m/s to the left
0 m/s, at rest
1 m/s to the right
2 m/s to the right
- 9. Multiple Choice
The 1-kg box is sliding along a frictionless surface. It collides with and sticks to the 2-kg box. Afterward, the speed of the two boxes is
0 m/s
1 m/s
2 m/s
3 m/s
There’s not enough information to tell.
- 10. Multiple Choice
A 4 kg object has a momentum of 12 kg-m/s. The object's speed is ______ m/s
3
4
12
48
none of these
- 11. 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. How much did the ball's momentum change?
-2.5 kg m/s
-6 kg m/s
-18 kg m/s
-45 kg m/s
- 12. 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. How much impulse did the ball experience?
-2.5 N s
-6 N s
-18 N s
-45 N s
- 13. 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 is encountered by the ball for a time of _______ seconds.
1.8
2.5
3.6
10
- 14. Multiple Choice
Consider the head-on collision between a lady bug and the windshield of a high speed bus. Which of the following statements are true? Select all that apply.
The magnitude of the force encountered by the bug is greater than that of the bus.
The magnitude of the impulse encountered by the bug is greater than that of the bus.
The magnitude of the momentum change encountered by the bug is greater than that of the bus.
The magnitude of the momentum change encountered by the bug is the same as that of the bus.
The magnitude of the acceleration encountered by the bug is greater than that of the bus.
- 15. Multiple Choice
Is momentum conserved in this collision?
Yes
No
- 16. Multiple Choice
Is momentum conserved in this collision?
Yes
No
- 17. Multiple Choice
A lunar vehicle is tested on Earth at a speed of 10 km/h. When the same lunar vehicle travels at the same 10 km/hr on the Moon, its momentum is
the same
less
more
zero
- 18. Multiple Choice
Your friend says that impulse is the same as momentum. Is he correct?
Yes, impulse is momentum
No, impulse is equal to the CHANGE in momentum
No, impulse is equal to acceleration
No, impulse is equal to velocity
- 19. Multiple Choice
Car 1 comes to a stop by hitting a haystack. Car 2 is the same mass, has the same speed, and comes to a stop by hitting a stone wall. The change in momentum is greater for
Car 1
Car 2
the momentum change is the same for both
none of the above
- 20. Multiple Choice
A 1-kg ball has the same speed as a 10-kg ball. Compared with the 1-kg ball, the 10-kg ball has
less momentum
the same momentum
10 times as much momentum
100 times as much momentum
- 21. Multiple Choice
An elastic collision occurs
when two objects collide and then bounce apart
when two objects collide and then stick together
any time two objects collide
only if one of the objects is a rubber ball
- 22. Multiple Choice
An inelastic collision occurs
when two objects collide and then bounce apart
when two objects collide and then stick together
any time two objects collide
only if one of the objects is a ball of clay
- 23. 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
- 24. 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
- 25. Multiple Choice
The impulse is _____the change in momentum
Greater than
Equal to
Less than
Always double
- 26. Multiple Choice
A car crashes into a wall with an impulse of 40,000 kg.m/s. The collision took 2 seconds . How much force did the wall exert?
60,000 N
40,000 N
20,000 N
80,000 N
- 27. Multiple Choice
If you push an object with a force of 10 N for 5 seconds , what is the impulse?
2 N s
50 n s
2 N/s
50 N/s
- 28. Multiple ChoiceThe graph shows the force on an object of mass M as a function of time. For the time interval 0 to 4 s, the total change in the momentum of the object is40 kg m/s20 kg m/s0 kg m/s– 20 kg m/s
- 29. Multiple ChoiceThe graph shows the force on an object of mass M as a function of time. For the time interval 0 to 4 s, the total change in the momentum of the object is40 kg m/s20 kg m/s0 kg m/s– 20 kg m/s
- 30. Multiple ChoiceThe difference between a car hitting a wall vs. a car hitting a hay stack isthe Impulse on the car hitting the wall is greaterthe change in momentum of the car hitting the wall is greaterthe force on the car hitting the hay stack is greaterthe collision time of the car hitting the hay stack is greater
- 31. Multiple ChoiceThe difference between a car hitting a wall vs. a car hitting a hay stack isthe Impulse on the car hitting the wall is greaterthe change in momentum of the car hitting the wall is greaterthe force on the car hitting the hay stack is greaterthe collision time of the car hitting the hay stack is greater
- 32. Multiple Choice
In which section of time is there more impulse?
0-1 sec
1-3 sec
3-5 sec
- 33. Multiple Choice
How much impulse does this object undergo?
5 Ns
10 Ns
25 Ns
50 Ns
- 34. Multiple Choice
How much momentum change will this object undergo?
5 kgm/s
10 kgm/s
25 kgm/s
50 kgm/s
- 35. Multiple Choice
Which case displays more of a change in momentum?
case A
case B
it is the same either way
- 36. Multiple Choice
Which case displays more of an impulse?
case A
case B
it is the same either way
- 37. Multiple Choice
Over the duration of this graphs, how much impulse is applied to the object?
0 Ns
1 Ns
2 Ns
4 Ns
- 38. Multiple Choice
A frisbee player throws a disc that is initially at rest. The net force on the disc over time is shown below.
Velocity increases, then decreases
The velocity does not change
Velocity increases
Velocity decreases
- 39. Multiple Choice
A croquet player hits a ball that is initially at rest. The net force on the ball over time is shown below. How does the ball's momentum change between 0ms and ms.
Momentum decreases
Momentum increases
Momentum is constant
Momentum is zero
- 40. Multiple Choice
A croquet player hits a ball that is initially at rest. The net force on the ball over time is shown below. How does the ball's momentum change between 0ms and ms.
Momentum decreases
Momentum increases
Momentum is constant
Momentum is zero
- 41. Multiple Choice
A tennis player hits a ball that is initially at rest. The net force on the ball over time is shown below. How does the ball's velocity change between 10m and 20ms
Velocity is constant, then increases
Velocity decreases the entire time
Velocity increases
The velocity does not change
- 42. Multiple Choice
A tennis player hits a ball that is initially at rest. The net force on the ball over time is shown below. How does the ball's velocity change between 10m and 20ms
Velocity is constant, then increases
Velocity decreases the entire time
Velocity increases
The velocity does not change
- 43. Multiple Choice
0 Ns
-1 Ns
1 Ns
Not Enough Information
- 44. Fill in the Blank
A toddler kicks 0.42kg soccer ball that is initially at rest. The net force on the ball over time is shown below.
The ball's speed at t=20ms is ______ m/s.
Round your answer to 3 s.f.
- 45. Fill in the Blank
A toddler kicks 0.42kg soccer ball that is initially at rest. The net force on the ball over time is shown below.
The ball's speed at t=20ms is ______ m/s.
Round your answer to 3 s.f.
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