Work,Energy & Power

Question 1

Work

Answer 1

It is the product of force and displacement along the direction of force.
w=F*d

Question 2

Energy

Answer 2

Ability to do work

Question 3

Mechanical energy

Answer 3

1. kinetic energy
2. potential energy

Question 4

Kinetic energy

Answer 4

Energy of object due to its motion.
Ek=1/2mv^2

Question 5

Potential energy

Answer 5

Energy stored in object

Question 6

Gravitational Energy

Answer 6

Energy of an object due to its position in gravitational field.
Eg=mgh

Question 7

Elastic Potential energy

Answer 7

Energy stored in object due to deformation.

Question 8

Heat

Answer 8

workdone of resistive forces
Heat= resistive forces* distance travelled

Question 9

Law of conservation of energy

Answer 9

Energy cannot be created but it can be transferred from one form to another. Total energy of the universe is constant. In any particular system, total input energy= total output energy.

Question 10

Power(p)

Answer 10

workdone/Energy per unit time.
P=w/t
=F.s/t
=Fv

Question 11

Efficiency

Answer 11

n=useful output energy/ total input energy *100%