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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

No work is done by a force if the body - Physics

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प्रश्न

No work is done by a force if the body

विकल्प

  • moves in direction of force

  • does not move

  • moves in opposite direction

  • none of the these

MCQ

उत्तर

does not move

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अध्याय 4: Energy - Objective questions [पृष्ठ ७७]

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सेलिना Concise Physics [English] Class 8 ICSE
अध्याय 4 Energy
Objective questions | Q 4.2 | पृष्ठ ७७

संबंधित प्रश्न

A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?


State the S.I. unit of work and define it.


Express joule in terms of erg.


Differentiate between energy and power.


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?


A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.


Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.


What is meant by a translational motion? Give one example.


What is the relationship between Nm and dyne cm?


How many joules are there in 1 mega joule?


Define 'joule'.


What is the amount of energy spent in lifting 1 kg through 1 m? Take g = 10 ms-2.

Name four different forms of energy.

Define energy and name its unit.

Define Translational motion.


(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?


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


Force acting on a particle moving in a straight line varies with the velocity of the particle v as F = `K/v`, where K is a constant. The work done by this force in time t is


Work done by this force at any instant is ______.


State whether work is done or not, by writing yes or no, in the following case:

A man pushes a wall.


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