Energy sources and resources | Baamboozle - Baamboozle

English 8 Public

Forms of energy , potential and kinetic energy.

Study Slideshow

………. energy is the energy stored in object due to its height or its position.(petrol - nuclear reactions - sun - coal)

Sun

Mechanical energy is the sum of .........energies.( potential and heat - potential and kinetic - potential and light - light and kinetic)

Potential and kinetic

An object of 20N weight is placed at 5m height , it has potential energy ........................

Potential = weight x height = 20 x 5 = 100 Joules.

An object of mass of 2Kg is moving at a speed of 4m/sec has a kinetic energy =.........

Kinetic energy = 1/2 x mass x speed 2 = 1/2 x 2 x 16 = 16

Chemical energy stored in ..................................

car battery.

As doubling height..................................

Potential energy increases to double value

As doubling the speed , The kinetic energy( - increases to double -decreases to double - increases to 4 times- decreases 4times- constant - increases 3times)))

Increases to 4 times. because, K.E = 1/2 x m x speed power 2

Calculate the mass of a body whose kinetic energy is 72 joules and its speed is 3 m/s

I/2 x mass = 72/ 9 = 8 , Mass = 8 / (1/2 ) = 16 Kg