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Review 2.A.2
Test Description: Use mathematical representations to support and verify the concepts that the total momentum of a system of objects is conserved when there is no net force on the system.
Instructions: Answer all questions to get your test result.
1) A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?
A
375 kg m/s
B
25 kg m/s
C
25 m/s
D
375 m/s
2) If two objects collide and stick together, what will happen to their overall total momentum?
A
momentum will stay the same
B
momentum will increase
C
none of these
D
momentum will decrease
3) ost modern vehicles have padded dashboards. This reduces collision injuries by...
A
increasing the time of impact
B
reducing the driver's change in momentum
C
increasing the force of impact
D
increasing the driver's change in momentum
4) A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball.
A
55 kg*m/s
B
250 kg*m/s
C
500 kg*m/s
D
100 kg*m/s
5) Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?
A
not enough information
B
car
C
bike
D
they are equal
6) Which of the following has the greatest momentum?
A
they are the same
B
A scurrying cockroach
C
A parked semi truck
D
not enough information
7) A 9 kg blob moving at 5 m/s collides and sticks to a second blob with a mass of 5 kg. If the two bobs stick together, what happen to the velocity of the two blobs?
A
stay the same
B
none of these
C
increase
D
decrease
8) A 9 kg blob moving at 5 m/s collides and sticks to a second blob with a mass of 5 kg. If the two bobs stick together, what will happen to the total momentum of the two blobs?
A
stay the same
B
decrease
C
increase
D
not enough information
9) A 9 kg blob moving at 5 m/s collides and sticks to a second blob with a mass of 5 kg. If the two bobs stick together, what will happen to the mass of the system?
A
increase
B
stay the same
C
decrease
D
not enough information
10) Which would have more momentum? A baseball or a bowling ball
A
they are the same
B
bowling ball
C
not enough information
D
baseball
*select an answer for all questions
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