Q3-W2: Energy

Anything that helps people do their work efficiently is called a _______.

• machine

• animal

• building

• vehicle

What is a simple machine?

• A simple machine has only one non-moving part.

• A simple machine is powered by electricity.

• A simple machine is made up of many complex parts.

• A simple machine can only be used in factories.

All machines need electricity or fuel.

• True

• False

True or False: All machines are big and bulky.

• True

• False

What are the three parts needed for a lever to operate?

• force, load, and fulcrum

• wheel, axle, and pulley

• spring, screw, and wedge

• gear, belt, and chain

A FULCRUM is the ________ point that provides support for the force to lift a load.

• pressure

• pivot

• balance

• center

What is a wedge?

• A tool shaped like a screw

• A tool shaped like an inclined plane with a narrow sharp edge

• A tool with a flat surface

• A round object

A ______ is a piece of pointed metal with grooves cut on an inclined plane that is used to fasten objects together.

• screw

• nail

• bolt

• pin

A wheel and axle helps us by:

• making it easier to move or lift objects

• making objects heavier to move

• stopping objects from rolling

• making work harder to do

Which of the following is NOT a way a wheel and axle help us?

• Carry heavy loads quickly

• Help us steer and turn

• Make things heavier

• Lift loads