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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
1.5
B
3
C
2
D
1
2) What is the mechanical advantage of a ramp 2.0 m long and 0.5 m tall
A
2.5
B
4
C
none of the answers are correct
D
1
3) Lifting a car using a jack is easier because it requires
A
less work
B
less force
C
none of the answers are correct
D
less time
4) a wedge is a modified
A
wheel and axle
B
inclined plane
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
31.5 J
B
709 J
C
354 J
D
15.8 J
6) an inclined plane
A
changes the direction of the force only
B
decreases the amount of work done
C
changes the magnitude of the force only
D
changes both the direction and magnitude of the force
7) what is the gravitational potential energy of a 54 kg box that is 8m above the ground
A
4300 J
B
5500 J
C
550 J
D
3400 J
8) which of the following is an example of mechanical energy
A
light energy
B
potential energy
C
nuclear energy
D
chemical 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
180 J
B
240 J
C
310 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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