Simple Machines and Work

A machine can do more work than you put into it.

• True

• False

The fixed point around which a lever rotates is called...

• Screw

• Input arm

• Fulcrum

• Work arm

How much work are you doing on a 100-Newton box when you hold it still 1 meter above the ground?

• 1 Joule

• 10 Joules

• 100 Joules

• 0 Joules

The unit of power is called _______.

What type of simple machine does the chain of a bicycle represent?

• Pulley

• Wheel

• Screw

• Wedge

The ratio between input arm and output arm is known as...

• Fulcrum

• Lever

• Mechanical Advantage

• Output Work

Which of these is not an example of a lever?

• A human leg

• A bottle opener

• A staircase

• A stapler

If you do the same work in more time, you use less power.

• True

• False

You lift a 20-Newton bag and put it on top of a 2-meter shelf. How much work have you done?

• 10 Joules

• 20 Joules

• 40 Joules

• 0 Joules

You use a lever to lift a 300-Newton rock. It has a mechanical advantage of 5. How much input force do you have to apply?

• 300 Newtons

• 60 Newtons

• 1500 Newtons

• 0 Newtons