Simple Machines

A shovel is pushed into the ground to move and lift soil. Which simple machine is this an example of?

• A screw

• A wedge

Answer explanation

A wedge is a simple machine used to split material. A shovel is a good example of a wedge.

A ramp helps push things up and down two different heights. Which simple machine is this an example of?

• An inclined plane

• A lever

Answer explanation

An inclined plane can help you to move heavy objects.

It is easier to move heavy things up a ramp than it is to lift them straight up.

Even if they weigh the same, he can easily lift his friend. A seesaw is an example of which simple machine?

• An inclined plane

• A lever

Answer explanation

When you push down on one side of a lever, the other side goes up.

Levers can also be used to lift heavy objects such as a rock or furniture. 

A crane can lift and carry very heavy objects. Which simple machine does a crane use to do this?

• A pulley

• A screw

Answer explanation

A pulley uses a wheel to change the direction of a force. As you pull down, the object goes up.

Sometimes pulling down is easier because the force of gravity helps.

A cap is twisted on to the bottle to tighten and close it. Which simple machine is this an example of?

• A screw

• A wedge

Answer explanation

Turning a screw produces a force that can push the screw into wood or tighten it against a nut.

Similar threads are used on jars and other containers so that lids close tightly.

Wheels allow things to move easier by rolling. Which simple machine are bike wheels an example of?

• A wheel and axle

• A screw

Answer explanation

An axle is a shaft, or rod, that is fixed to the center of a wheel.

A slanted roof is an example of which simple machine?

• An inclined plane

• A screw

Answer explanation

The slope of the roof allows rainwater and snow slide down to the ground.