Chapter 13 Quiz

Driving a car 100 m requires the same amount of as pushing it 100 m by hand.

• Power

• Power and energy

• Time

• Work

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We use simple machines in order to...

• increase energy output

• decrease the amount of work we do

• make work easier to do

• do all of the above

Truth or False: Work is done anytime a force is applied over a period of time.

(a)  

Truth or false: A 30 kW machine can do the same amount of work in half the time as a 15 kW machine.

(a)  

Truth or False: The greater the mechanical advantage of a machine, the more the input distance decreases.

(a)  

It takes a 500 kW motor 25 s to lift a boulder. How much work does the motor do?

• 52,500 J

• 12,500 kJ

• 20 J

• 10,000 kJ

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Which of the following the formula for power?

What is the name for the turning force of a lever?

• Fulcrum

• Newton

• Horsepower

• Torque

A child applying her full weight of 220 N is seated 1.8 m from the fulcrum of a seesaw. Where must a child applying 495 n sit on the other side in order to achieve equilibrium?

• 0.80 m from the pivot point

• 1.3 m from the pivot point

• 2.25 m from the pivot point

• 4.1 m from the pivot point

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Using a first-class lever to move a rock, you exert 60 N of force as you move the lever 1.0 m. The lever applies a force of 200 N to move the rock 0.20 m. What is the AMA of the lever?

• 0.20

• 0.30

• 3.3

• 5.0

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