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 ______________.( 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 )

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 ______________ energy .( all letters should be in smalls)

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

Led is example of -

• light

• chemical

• electrical

• mechanical

A loud and noisy sound produces 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