Want to make interactive content? It’s easy in Genially!

Over 30 million people build interactive content in Genially.

Check out what others have designed:

NORMANDY 1944

Horizontal infographics

BEYONCÉ

Horizontal infographics

ONE MINUTE ON THE INTERNET

Horizontal infographics

SITTING BULL

Horizontal infographics

RUGBY WORLD CUP 2019

Horizontal infographics

GRETA THUNBERG

Horizontal infographics

Transcript

Work and Energy

  • Work done on an object is defined as the magnitude of force multiplied by distance moved by the object in the direction of the applied force.
  • W = F x s
  • If displacement is 0, work done will also be 0.
  • Work has only magnitude and no direction
  • Work done by a force can be either positive or negative.

Energy

  • Kilowatt hour ( kWh )
  • Energy used in 1 hour at the rate of 1 kW is called 1 kWh.
  • 1 kWh = 3.6 x 106 J
  • 1 unit = kWh

  • According to the law of conservation of energy , energy can only be transformed from one from to another ; it can neither be created nor destroyed. The total energy before and after the transformation always remains constant.
  • K.E + P.E = constant
  • Sum of K.E and P.E of an object is its total mechanical energy.

Commercial Unit of energy

  • Joule ( J )
  • 1 joule = 1 newton x 1 metre

Power

  • Rate of doing work or rate of transfer of energy.
  • Power = Work / Time
  • P = W/t

SI unit

  • Defined as the capability to do work.
  • Object which does the work loses energy and the object on which the work is done gains energy.
  • SI unit : Joule ( J )
  • Various forms of energy : mechanical energy, heat energy, chemical energy, electrical energy and light energy.

Law of Conservation of Energy

  • Energy possessed by an object by virtue of its position or configuration.
  • Gravitational potential energy Work done in raising an object from the ground to a point above the against gravity .
  • Potential energy, Ep = mgh

Potential energy ( P.E )

  • Forms of energy

Kinetic Energy ( K .E )

  • Energy possessed by an object by virtue of its motion.
  • Kinetic energy of a body of mass moving with a certain velocity is equal to the work done on it to make it acquire that velocity.
  • Kinetic energy Ek = 1/2 mv2