Understanding Simple Machines

What is the main idea of the passage?

• Mr. Lee explains how different simple machines work.

• Simple machines make our work easier.

• How pulleys are used in elevators.

• The history of simple machines.

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Main idea

Whose point of view is primarily presented in the passage?

• A teacher.

• An engineer.

• A student.

• A historian.

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Point of view

How do the wheel and axle interact with the concept of friction according to the passage?

• They increase friction.

• They have no effect on friction.

• They decrease friction.

• They only work without friction.

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Interaction of ideas

What does "fulcrum" mean in the passage?

• A type of screw.

• A fixed point on which a lever moves.

• The edge of a wedge.

• A part of the wheel and axle.

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Vocabulary