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Chapter 13
Test Description: Work
Instructions: Answer all questions to get your test result.
1) What is the mechanical advantage of a single movable pulley
A
2
B
3
C
1
D
1.5
2) What is the mechanical advantage of a ramp 2.0 m long and 0.5 m tall
A
none of the answers are correct
B
1
C
4
D
2.5
3) Lifting a car using a jack is easier because it requires
A
less work
B
less time
C
less force
D
none of the answers are correct
4) a wedge is a modified
A
inclined plane
B
wheel and axle
C
lever
D
pulley
5) what is the kinetic energy of a 1.4 kg discus with a speed of 22.5 m/2
A
354 J
B
15.8 J
C
31.5 J
D
709 J
6) an inclined plane
A
decreases the amount of work done
B
changes the magnitude of the force only
C
changes both the direction and magnitude of the force
D
changes the direction of the force only
7) what is the gravitational potential energy of a 54 kg box that is 8m above the ground
A
550 J
B
4300 J
C
3400 J
D
5500 J
8) which of the following is an example of mechanical energy
A
potential energy
B
nuclear energy
C
chemical energy
D
light energy
9) The efficiency of a ramp is 75%. If the amount of work input is 240 J, what is the amount of useful work output.
A
240 J
B
310 J
C
180 J
D
320 J
10) If a person tries to life a heavy box for 5 seconds and can't make it budge, the work down is less than zero
A
true
B
false
*select an answer for all questions
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