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Fall Review 1
Test Description: Conceptual Physics Fall Review 1
Instructions: Answer all questions to get your test result.
1) A boulder at the top of a vertical cliff has a potential energy of 100 MJ relative to the ground below. It rolls off the cliff. When it is halfway to the ground its kinetic energy
A
more than 60 MJ
B
about 60 MJ
C
negligible
D
the same as its potential energy at that point
2) Suppose you put in 100 J of work on a lever and get out 93 J of work. How much of the work input is lost as heat?
A
100%
B
93%
C
7%
D
1.1%
3) Torque _____.
A
produces rotational acceleration.
B
is caused by a turning force.
C
All of these statements are true.
D
is caused by an applied force acting through a lever arm.
4) Which statement is TRUE of an object that spins when it’s thrown through the air?
A
All parts of the object follow a parabolic path.
B
All of these statements are true.
C
No part of the object follows a parabolic path.
D
The object spins about its center of mass.
5) Which statement is true about toppling?
A
Toppling occurs whenever the center of gravity is above the support area.
B
Toppling occurs when a vertical line through the center of gravity (CG) falls within the object’s ba
C
Toppling occurs when an unbalanced torque exists.
D
All of these statements are true.
6) A meter stick is suspended at its midpoint and two blocks are attached. A 10-N block is attached 20 cm to the left of the midpoint. Where must a 40-N block be placed to balance?
A
25 cm to the right of the midpoint
B
5 cm to the right of the midpoint
C
10 cm to the right of the midpoint
D
20 cm to the right of the midpoint
7) Which description would produce the greatest torque?
A
small force, short lever arm
B
large force, long lever arm
C
large force, short lever arm
D
small force, long lever arm
8) In physics, work is defined as______________.
A
force times distance
B
force times time
C
force divided by time
D
distances divided by time
9) If you apply 25 N of force on a box over 10 meters, how much work did you do on the box?
A
15 J
B
0.4 J
C
30 J
D
250 J
10) How much farther will a car traveling at 100 km/s skid than the same car traveling at 50 km/s?
A
four times as far
B
half as far
C
the same distances
D
twice as far
*select an answer for all questions
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