Work and Power

Work is the product of...

• speed and force.

• power and force.

• force and distance.

• motion and force.

Which of the following is a unit of work?

• joule

• watt

• horsepower

• newton

What is the formula for work?

• force x time

• force / distance

• distance / time

• force x distance

How much work is done when a 10 N force moves an object 2 m?

• 5 J

• 20 J

• 2 J

• 10 J

Power is equal to work divided by...

• time

• force

• distance

• mechanical advantage

The work that goes INTO a machine is called...

• output

• input

• outtake

• intake

The work that comes OUT of a machine is called...

• output

• input

• outtake

• intake

Efficiency is always less than 100% because of...

• mass

• gravity

• friction

• distance

If there is no movement, work is still done.

• true

• false

Answer explanation

No work is done if there is no movement.

To increase power, you can increase the amount of work done in a given time.

• true

• false