Fall Semester Final Exam - Physics Review Answers - 2014
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3Fall Semester Final Exam – Physics Review Answers
1.
Define the following terms:
Speed:
Distance divided by time.
The length of the path traveled, used to calculate speed.
Distance:
Velocity:
Displacement divided by time, always stated with a direction.
Displacement:
Measurement of length and direction from the start point to end point.
Acceleration:
Change in velocity divided by time; occurs whenever an object speeds up, slows down or
changes direction
Potential Energy:
Stored energy not presently doing work, as in a raised object or compressed spring.
Kinetic Energy:
Energy presently doing work, such as in a moving object.
Work:
Distance times force. For work to be done, an object must be moved with a force.
2.
If Tom takes a trip to Austin in 3.5 hours with a displacement of 350 km south and a distance of 425 km, what is
121.4
100
south
the average speed and velocity of the trip? Speed:
km/h Velocity:
km/h
3.
In the experiment shown in the diagram above, describe the motion of the two masses on the air track when
they collide in the middle of the track.
Both masses will bounce backwards after the collision, with the smaller
mass moving at a faster speed.
2
4.
The acceleration of a falling object due to gravity is 9.8 m/s
. If an object falls for exactly 3 seconds, how fast will
2
29.6
(3 s x 9.8 m/s
= 29.6 m/s)
it be going?
m/s
5.
If a model rocket has a mass of 0.2 kg and its rocket engine has a thrust (force) of 1.5 Newtons, what will its
2
acceleration be?
7.5
m/s
6.
If two boys on skateboards, Tom and Jerry, push off of one another with a combined force of 60 Newtons, how
much acceleration will each experience, if Tom has a mass of 40 kg and Jerry has a mass of 60 kg?
2
2
Tom:
1.5
m/s
Jerry:
1.0
m/s
7.
As a car travels on the roller coaster, at what points does a rider feel the heaviest or lightest: at the bottom of
the valley or at the very top of a hill? Heaviest:
Bottom of valley.
Lightest:
Top of hill.
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