Glencoe Science Level Blue

Chapter 20: Work and Simple Machines

Standardized Test Practice

1
What is the work done by a boy if he expends 40.5 W of power pulling a sled up a hill in 10.5 s?
A)3.9 J
B)39 J
C)425 J
D)42.5 J
2
What is the output force of the lever if the input force is 300 N?

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A)30 N
B)200 N
C)1800 N
D)50 N
3
If the input force is 110 N, how far should the triangular block be placed from the input force edge of the plank so that the output force is 44 N?

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A)35 cm
B)44 cm
C)56 cm
D)40 cm
4
What is the input force needed to lift a 30-N weight using the pulley system in the illustration?

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A)5 N
B)15 N
C)20 N
D)10 N
5
What work have you done if you push a wagon with a force of 36 N for a distance of 2.0 m, and the wagon continues to roll for 1.0 m after you stop pushing?
A)12 J
B)18 J
C)72 J
D)110 J
6
What is the mechanical advantage of a wheel with a radius of 6.0 cm connected to an axle with a radius of 1.1 cm?
A)0.18
B)1.1
C)6.6
D)5.5
7
How far do you have to push a 5.5-kg box to do 38 J of work if you use a force of 22 N?
A)0.3 m
B)1.7 m
C)3.2 m
D)9.5 m
8
A fulcrum is used for which simple machine?
A)inclined plane
B)pulley
C)wheel and axle
D)lever
9
What is the mechanical advantage of an inclined plane if its height is 5.0 m, the sloped surface is 12.0 m long, and its horizontal distance is 7.0 m?
A)1.4
B)2.4
C)1.7
D)2.1
10
What is the efficiency of a ramp if you do 175 J of work pushing a 12-kg box up the ramp, and the ramp does 125 J of work?
A)59%
B)71%
C)68%
D)85%
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