Question

What is work?what is power

Answer 1

A force is said to do work if there is a displacement in the direction of the force.
W = F X d  (F - force, d - displacement)
Power is the rate of doing work, the amount of energy transferred per unit time.
P = W/T  (T - time)

Answer 2

Hi

Here is your answer,

Q.1 What is Work?

→Work is said to be done by a force, when the body is displaced actually through some distance in the direction of the applied force. Thus, work is done on a body only if the following two conditions are satisfied:-

1) A force acts on a body.

2) The point of application of the force moves in the direction of the force.

Ex:- Work is done when an engine pulls a train, a man goes up a hill, a horse pulls a cart etc.

Q.2 What is Power?

Ans. Power is defined as the time rate at which work is done or energy is transferred by it.

  → Power is a scalar quantity, because it is the ratio of two scalar quantities work and time. The dimensional of power is [ ML²T⁻³]

  Average power = Rate of doing work

                        = WORK DONE/ TIME TAKEN = W/t 

    → The SI unit of power is watt(W)

    → Another popular unit of power are kilowatt and horsepower.

                     1 watt = 1joule/ 1 second = 1 Js⁻¹

1 kilowatt = 1000 watt or 1 kW = 10³ W

1 horsepower = 746 watt or 1 hp = 746 W

The unit is used to describe the output of Engines, motorbikes and automobiles etc.

Hope it helps you !