Friday, August 20, 2021

Energy

 What is energy?

Energy is the ability to do work or cause change. Work is when force causes an object to move. Most of our energy comes from the Sun. The Sun heats Earth. The Sun's light energy makes plants grow.

We use many other forms of energy too. Sound energy comes from a CD player. Chemical energy runs a car's engine. Electrical energy runs many things in this kitchen. 

Stored energy is potential energy. It can change into another kind of energy to do work or cause a change.

Fuel, such as natural gas, has potential energy. Long ago, plants made food using energy from the Sun. The plants died and turned into fossils that are used as fuel. When we burn this fuel, we free potential energy. Work is possible.

When you use batteries, you release potential energy. The stored energy in food, fuels, and batteries is chemical energy.


Vocabulary:

ability                :            có khả năng

force                  :            lực lượng

chemical            :            hóa chất

engine                :            động cơ

stored                 :            cất giữ

potential             :            tiềm năng

fossils                 :            hóa thạch

fuel                     :            nhiên liệu

possible              :            khả thi

batteries              :            pin

release                 :           phóng thích


21/8/2021

 Levic


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