Page 246 - New Medley 4 Semester 2 PDF (Merged)

Screwdriver, a pair of scissors, pliers, screw, Knowledge Zone

bottle opener, nutcracker, lever, wheel and axle, An iron rod is also a kind of simple
pulley, inclined plane, a wheelbarrow, etc., are machine.

some common simple machines.

2 • Critical Thinking

Write True or False.
1. Hydroenergy comes from wind.

2. Energy cannot be changed from one form to another.

3. Machines make our work easier and faster.
4. Simple machines change the direction of force applied.

AT ONE GO

m Force is the push or pull applied to a body.
m Work is done when a force moves an object through a distance.

m Energy is the ability to do work. It can be changed from one form to another.
m There are renewable and non-renewable sources of energy.
m Simple machines make our work easier and faster.

REMEMBER THESE TERMS

Force : A push or pull
Solar : Related to the sun

Hydropower : Power obtained from water
Renewable : Which is replaced naturally
Conserve : To save

Crisis : A situation of danger
Machine : A simple tool which makes work easier

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