A drum of water was placed on a trolley and pushed with the hand-held force probe. The trolley rolled across the floor and came to rest a few seconds later.
Answer the questions by looking carefully at the graphs which were made with a motion detector and a force probe attached to a computer.
1 For what time did the force act on the trolley?
a 1.00 s
b 1.4 s
c 2.0 s
d 6.0 s
2 Why can a straight line be fitted to the velocity-time graph
between 4.0 and 7.7 s?
a The friction force is zero.
b The friction force is constant.
c The acceleration of the trolley is negative.
3 The slope of the velocity-time graph between 4.0 and 7.7
seconds gives the....
a.... work done by friction on the trolley.
b.... the momentum of the trolley.
c.... the friction force acting on the trolley.
d.... the acceleration of the trolley.
Why is the velocity-time graph between 4.0 and 7.7 seconds
not a perfectly straight line?
a The trolley is running up hill.
b The trolley wheels are not running evenly across the floor.
c The computer is not working properly.
d The bat has hiccups.
5 Why do we sometimes call the motion detector a 'bat'?
a It looks like a bat.
b It detects echoes like a bat.
c It smells like a bat.
d It sounds like a bat.
6 The distance the trolley 'skids' is best written as....
a.... 1.06 m
b.... 1.0 m
c.... 1.06 ± 0.02 m
d.... 1.0 ± 0.02 m
7 The total distance the trolley moves from 2 second to 8
seconds is closest to....
a.... 1.06 m
b.... 1.5 m
c.... 1.500 m
d.... 1.96 m
8 The total time that the trolley was moving was closest to....
a.... 5.4 s
b.... 1.6 s
c.... 3.7 s
d.... 10.0 s
9 The area under the force-time graph is called?
a Work
b Impulse
c Inertia
d Momentum
10 Newtonian Mechanics holds that (neglecting friction)....
a.... the area under the force-time graph equals kinetic energy.
b.... the area under the force time graph equals the distance traveled.
c.... the area under the force time graph equals the mass of the drum.
d.... the area under the force time graph equals the momentum of the drum (mv).