GKE Investigation 4 Question Preview (ID: 45801)
Momentum And Impulse.
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Speed is
a) A measure of how fast something is moving.
b) Always measured in terms of a unit of distance divided by a unit of time.
c) The distance covered per unit time.
d) All of these.
A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average acceleration?
a) 0.17 m/s2
b) 1.67 m/s2
c) 6 m/s2
d) 7 m/s2
Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is
a) 30 km/h
b) 60 km/h
c) 180 km/h
d) 360 km/h
The momentum of an object is defined as the object’s
a) Mass times its velocity
b) Force times the time interval
c) Force times its acceleration
d) Mass times its acceleration
The reason padded dashboards are used in cars is that they
a) Look nice and feel good
b) Decrease the impulse in a collision
c) Increase the force of impact in a collision
d) Increase the time of impact in a collision
How does the momentum of an object change if the object’s velocity doubles?
a) The momentum doubles.
b) The momentum increases by a factor of four.
c) The momentum decreases by a factor of 1/2.
d) The momentum decreases by a factor of 1/4.
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 over a long distance.
c) A large force may produce a small change in momentum by acting over a short time interval.
d) A small force may produce a large change in momentum by acting on a very massive object.
If a net force acts on an object, then the object’s momentum
a) will increase.
b) will decrease.
c) will either increase or decrease.
d) may or may not change.
Which of the following involves a change in momentum?
a) A bowling ball rolls down the lane at constant speed.
b) A car coasts down a hill at constant speed.
c) A sky diver descends with terminal velocity.
d) A spacecraft travels at constant speed while slowly losing mass.
What could cause the a decrease in the momentum of a moving object?
a) a decrease in volume
b) an increase in volume
c) a decrease in speed
d) an increase in speed
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