हिंदी
तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनतमिलनाडु प्राथमिक विद्यालय कक्षा ४

Mention whether work is done or not in the following activity. S. No Activity Work done or not done 1. Pushing the door 2. Holding a doll 3. Sitting in a bus 4. Pushing a wall 5. Digging soil - Science

Advertisements
Advertisements

प्रश्न

Mention whether work is done or not in the following activity.

S. No Activity Work done or not done
1. Pushing the door  
2. Holding a doll  
3. Sitting in a bus  
4. Pushing a wall  
5. Digging soil  
सारिणी

उत्तर

S. No Activity Work done or not done
1. Pushing the door Work done
2. Holding a doll Not done
3. Sitting in a bus Not done
4. Pushing a wall Not done
5. Digging soil Work done
shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Work and Energy - Try to Answer [पृष्ठ १०४]

APPEARS IN

सामाचीर कलवी Science - Term 1 [English] Class 4 TN Board
अध्याय 3 Work and Energy
Try to Answer | Q 2 | पृष्ठ १०४

संबंधित प्रश्न

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?


Write the expression for work done by a force.


State the S.I. unit of energy.


Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.


How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?


A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?


Choose one or more correct alternatives.

Joule is the unit of ______.

  1. force
  2. work
  3. power
  4. energy

State the conditions of equilibrium for a rigid body.


What should be the angle between the directions of the displacement and the applied force so that the work done is zero?

A boy of mass m climbs up a staircase of vertical height h.

  1. What is the work done by the boy against the force of gravity?
  2. What would have been the work done if he uses a lift in climbing the same vertical height?

Name the type of energy possessed by a
(i) stretched catapult        (ii) hot iron
(iii) wound up clock


A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?


Fill in the boxe to show the corresponding energy transformation.


A bullet of mass 25 g has a velocity of 600 ms-1. What is the kinetic energy of the bullet? If it penetrates 50 cm into a target, find the resistive force offered by the target.

Define Translational motion.


A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.


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

An engine is pulling a train.


A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car


What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)


A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×