WORK AND ENERGY

What is the formula of work

• w= S*D

• W=P*B

• W=F*D

• W=F*G

A vertically force does not do work on a horizontally displaced object because -

• the force of the object in the direction is 0

• its having no displacement and is in the force of 0

• displacement of the object in the direction of the force, is 0

• No force is applied

Solar cells change light energy into (a)   .( all the letters should be in small )

The sun's heat ________ our earth and this enables it to support our earth and enable this to support a _______ variety of life . ( All letters should be in small and please add a and between your two answers )

(a)  

Flowing water can move a log of wood from one place to another . TRUE/FALSE

• True

• false

A energy own by an object because of its motion is called (a)   energy .( all letters should be in smalls)

Electrical bulb lights up when an (a)   flows through it .( all letters should be in small)

Led is example of -

• light

• chemical

• electrical

• mechanical

A loud and noisy sound produces a (a)   and disturbing effect on us . ( all letter should be in small )

The motion of the blade of a fan is because -

• mechanical energy

• potential energy

• kinetic energy

• electric energy