Page 17 - RoboGenius Pro C2
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ECOTECH Electric cars use electricity to run. They are better for the environment
ENERGY because they don't pollute the air with smoke.
« A machine is a tool that helps people do work easily.
« A simple machine is a tool that helps you to lift, push, pull or
move things.
« A lever is a simple machine that helps us lift or move things easily.
« A pulley is a wheel with a rope around it. It helps us lift or move things easily.
« An inclined plane is a flat surface that is slanted.
« A wheel and axle has a big wheel and a small rod (axle) in the center.
« A wedge is a simple machine that has a sharp edge. It is used to cut, split or shape
objects. For example, a knife cuts fruits and vegetables and an axe splits wood.
« A complex machine is made up of two or more simple machines that work together
to make a task easier.
« An escalator is a complex machine that uses pulleys and inclined planes to move
people up and down safely and easily.
« A wheelbarrow uses a wheel and axle to move loads easily and a lever to lift heavy
materials with less effort.
ROBO CHECK
A. Tick ( ) the correct option.
1. Select the simple machine used in a see-saw.
(i) Pulley (ii) Lever
(iii) Inclined plane (iv) Wedge
2. Which of the following is an example of a simple machine?
(i) Bicycle (ii) Scissors
(iii) Pulley (iv) Crane
Simple and Complex Machines
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