4th Class Science Force, Work and Energy Force, Work and Energy

Force, Work and Energy

Category : 4th Class

 

Force, Work and Energy

 

Synopsis

 

Tit Bits

Renewable sources of energy are those that are renewed naturally. For example, solar energy, wind energy and water energy.

 

 

  • Force is the push or pull of an object.

 

  • By applying force, we can

-move a body,

-stop a moving body,

-change the direction of a moving body and

-make the body move slower or faster.

 

  • Friction is the force which stops the movement of a body when the body is in contact with a surface.

 

  • Force moves objects and friction stops objects.

 

  • There are different types of forces. Animals and human beings use muscular force.

 

  • The force applied with the help of tools is called mechanical force and it produces movement.

 

  • The force of the earth on all the bodies present on it is called gravitational force.

 

  • When a force moves an object through a distance, then work is said to be done.

 

  • The tools which help us in doing work are called simple machines.

e.g., scissors, pulley, etc.

 

  • Machines increase the speed of work being done and change the direction of force.

 

  • Energy is the capacity to do work.

 

  • The energy stored in our muscles is called muscular energy.

 

  • A moving wind has energy. It is used to produce electricity.

 

  • The energy possessed by moving water is called hydel energy or water energy.

 

  • The electricity produced with hydel energy is called hydroelectricity.

 

  • Burning of fuels produces heat energy. It is used to cook food, heating water and to run vehicles.

 

  • Electrical energy is used to produce light and run different machines.

 

  • The energy we get from the sun is called solar energy.

 

  • Energy can be converted from one form to another.

 

  • The sun is the ultimate source of energy.

 

Other Topics

Notes - Force, Work and Energy
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