Simple machines

The unit of measure for work is_____________.

• meters

• joules

• newtons

• millibars

The unit of measure for force is _____________

• meters

• joules

• miles per hour

• newtons

True or False. The formula for work is Work = Force x Distance (W= F x D).

• True

• False

Work is done when .....

• a force is exerted on an object.

• an object exerts force onto another object.

• a force is exerted on an object causing the object to move.

• an object does not move.

True or False. When a force is applied to an object and it does not move then work was done.

• True

• False

How much work was done when a force of 12 newtons was applied to an object and the object move 2 meters?

• 14 Joules

• 24 Joules

• 14 Newtons

• 24 Newtons

How can you increase the efficiency of a pulley?

• change its color

• apply oil to the wheels to help them spin better

• decrease the size of the wheels

• cover the wheels with a rough material

An ax head is a simple machine called a wedge. How can you make the cutting edge more efficient?

• make it longer

• make it shorter

• make sharper

• make it more rounded

How can you make an inclined plane more efficient?

• cover it with a rough material

• make it face the opposite direction

• increase the height

• increase the length

Which ramp will require the least amount of force?

• A

• B

• C

• D