Simple Machines and Work Review

Which of these activities would require the least effort?

• Walking up a short ramp with a steep incline.

• Walking up a long ramp with a steep incline.

• Walking up a long ramp with a slight incline.

• Bypassing the ramp and jumping directly onto a platform.

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Which Olympic event features an inclined plane?

• The 100-meter dash

• Swimming

• Downhill skiing

• Ice skating

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What is a lever?

• Any piece of metal that bends.

• Any bar or a rod that's set up to tilt on a fulcrum.

• Any bar that's used to lift a load.

• Any bar that's attached to a pulley.

In a doorknob, what part functions as the wheel?

• The knob itself

• The metal rod in the middle

• The fulcrum

• The keyhole

Simple machines make work easier by increasing what?

• The distance over which work is done.

• The force needed to do work.

• The time required to do work.

• The acceleration of a massive object.

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

• 600 Joules

• 660 Joules

• 900 Joules

• 1200 Joules

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800 joules of work were done with a force of 200 newtons. Over what distance was the force applied?

• 40m

• 20m

• 4m

• 2m

The handles of a wheelbarrow are an example of what type of simple machine?

• Pulley

• Lever

• Inclined Plane

• Wheel and Axle

An ax, a zipper, and a front tooth are examples of a simple machine called a

• Lever

• Wedge

• Screw

• Inclined Plane

In which of the following situations do your arms do work on books?

• holding a heavy stack of books while standing

• carrying a heavy stack of books

• picking up a pile of books from the floor

• dropping a stack of books onto a table