Physical Science 8.2

A device that makes work easier by changing the size or direction of a force is called what?

• power

• watt

• joule

• machine

Which of the following is not an example of an everyday machine?

• chopsticks

• scissors

• wheelchair

• wood

The work you do on a machine is called

• work

• distance

• greater

• work output

• work input

The work done by the machine on an object is the

• work

• distance

• greater

• work output

• work input

Work output can never be ________ than work input.

• work

• distance

• greater

• work output

• work input

Machines make work easier but do not change how ______ is done.

• work

• distance

• greater

• work output

• work input

When a machine changes the size of the force, the _______ through which the force is exerted must also change.

• work

• distance

• greater

• work output

• work input

What does mechanical advantage measure?

• the number of times force is multiplied

• the amount of time the machine works

• the number of machines used

• the amount of force needed

Which of the following is the formula for finding mechanical advantage?

• MA = input force / output force

• MA = output force / input force

• MA = input force / output force x 100

• MA = output force / input force x 100

What do you know about a machine with a mechanical advantage of more than 1?

• The input force is greater than the output force

• The output force is greater than the input force

• The distance the object moves increases

• The distance the object moves decreases