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GKE Investigation 4
Test Description: Momentum and impulse
Instructions: Answer all questions to get your test result.
1) Speed is
A
A measure of how fast something is moving.
B
All of these.
C
Always measured in terms of a unit of distance divided by a unit of time.
D
The distance covered per unit time.
2) A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average acceleration?
A
7 m/s2
B
1.67 m/s2
C
6 m/s2
D
0.17 m/s2
3) Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is
A
180 km/h
B
360 km/h
C
60 km/h
D
30 km/h
4) The momentum of an object is defined as the object’s
A
Force times its acceleration
B
Mass times its velocity
C
Mass times its acceleration
D
Force times the time interval
5) The reason padded dashboards are used in cars is that they
A
Increase the time of impact in a collision
B
Decrease the impulse in a collision
C
Look nice and feel good
D
Increase the force of impact in a collision
6) How does the momentum of an object change if the object’s velocity doubles?
A
The momentum decreases by a factor of 1/2.
B
The momentum increases by a factor of four.
C
The momentum doubles.
D
The momentum decreases by a factor of 1/4.
7) Which of the following is true of changes in momentum?
A
A small force may produce a large change in momentum by acting over a short time interval.
B
A small force may produce a large change in momentum by acting on a very massive object.
C
A small force may produce a large change in momentum by acting over a long distance.
D
A large force may produce a small change in momentum by acting over a short time interval.
8) If a net force acts on an object, then the object’s momentum
A
will decrease.
B
will increase.
C
may or may not change.
D
will either increase or decrease.
9) Which of the following involves a change in momentum?
A
A bowling ball rolls down the lane at constant speed.
B
A spacecraft travels at constant speed while slowly losing mass.
C
A car coasts down a hill at constant speed.
D
A sky diver descends with terminal velocity.
10) What could cause the a decrease in the momentum of a moving object?
A
an increase in volume
B
a decrease in volume
C
an increase in speed
D
a decrease in speed
*select an answer for all questions
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