English

Distinguish Between Work and Power. - Physics

Advertisements
Advertisements

Question

Distinguish between work and power.

Distinguish Between

Solution 1

Work is said to be done only when the applied force on a body makes the body move but power is the rate of doing work.
The SI unit of work is 'joules' and that of power is 'watt'.

shaalaa.com

Solution 2

Work does not depend on time, while the power depends on time.
Power is the work done in unit time.

shaalaa.com
  Is there an error in this question or solution?
Chapter 1: Force, Work, Energy and Power - Exercise 1.4 ii [Page 38]

APPEARS IN

Frank Physics - Part 2 [English] Class 10 ICSE
Chapter 1 Force, Work, Energy and Power
Exercise 1.4 ii | Q 32 | Page 38
ICSE Physics [English] Class 10
Chapter 1 Force, Work, Power and Energy
Short Answers | Q 100

RELATED QUESTIONS

Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

A sailboat is moving due to wind energy.


What is the work done by the moon when it revolves around the earth?


Write the expression for work done by a force.


A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.


A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.


A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?


Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.


The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.


The work done on an object does not depend on the :


When you move upstairs, do you perform some work?


On what factors does the work done by a force depend?


A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i)    work done by machine,
(ii)    power at which the machine works.


What change should be effected in the velocity of a body to maintain the same K.E., if its mass is increased four times?

Name the physical quantity whose SI unit is Nm.

Give an example

Light energy changes to electrical energy.


A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.


A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

A donkey is carrying a load on its back.


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

Food grains are getting dried in the sun.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×