Simple Machines 3rd Grade

Front

This makes work easier and has one or no moving parts.

Back

simple machine

Front

This uses a grooved wheel with a rope or belt around it. It helps a person lift or move something up, down, or across an area by changing the direction of force.

Back

pulley

Front

This is often used to hold things together.

Back

screw

Front

This simple machine is 2 parts that move at the same time and both parts turn to help a person move something. It produces rotational motion which can be turned into straight-line motion.

Back

wheel and axle

Front

This could be a ramp.
It is a flat surface that is higher at one end. 
It helps a person move something up or down from one place to another.

Back

inclined plane

Front

This is a flat bar that rests on a fulcrum.
It helps a person move or lift something.
An example is a see-saw.

Back

lever

Front

This is an object with a sharp edge.
It helps spread or cut something.
It is 2 inclined planes that come together to a point on one side.

Back

wedge

Front

Which is an example of someone using a simple machine to do work? Options: a boy runs across a football field, a banker counts money, a mother pushes a stroller up a ramp, a girl reads a book

Back

a mother pushes a stroller up a ramp

Front

Which is a characteristic of a simple machine? Options: They run on electricity., They take a long time to make., They have few or no moving parts., They are not very large.

Back

They have few or no moving parts.

Front

Flagpole

Back

pulley