Work, Energy And Power

Question 1

Define work done by a force

Answer 1

Work done by a force on a body is the product of the forces and the displacement in the direction of the force.

Question 2

What is the equation of work done by an expanding gas

Answer 2

W_{by gas}=p(V_f - V_i)

Question 3

Define GPE

Answer 3

GPE of a body is the energy it possesses due to its position in the gravitational field.

Question 4

Define elastic potential energy

Answer 4

When work is done by an applied force on an elastic body, it deforms and its shape changes. As a result of its deformation, the body is able to store energy in the form of EPE.

Question 5

What is the equation for the principle of COE for system with only gravitational and or elastic forces?

Answer 5

Ep_i +Ek_i=Ep_f+Ek_f

Question 6

What is the equation for principle of COE for system with other forces?

Answer 6

Ep_i+Ek_i +W_other=Ep_f+Ek_f

Question 7

Define power

Answer 7

Power is defined as the rate at which work is done.

Question 8

Define PCOE

Answer 8

Energy can neither be created nor destroyed, it can only be transformed from one form to another