Is it possible that an object is in the state of accelerated motion due to external force acting on it, but no work is being done by the force. Explain it with an example.
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Write an expression for the work done when a force is acting on an object in the direction of its displacement.
When a force F displaces a body through a distance S in the direction of the applied force, then the work done W on the body is given by the...
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Certain force acting on a 20 kg mass changes its velocity from 5 m s–1 to 2 m s–1 . Calculate the work done by the force.
Mass of the body = 20 kg Initial velocity = 5 m/s Final velocity = 2 m/s We know that , Work done = change in kinetic energy = 1/2 mu2 - 1/2 mv2 = 1/2...
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Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher
Yes, it is true. There may be displacement in the absence of force. We know that, F =...
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An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
The object is in motion, so its energy = kinetic energy = 1 /2 mv2 The kinetic energy of the object, when it comes to rest = 0. Work done on object...
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When a force retards the motion of a body, what is the nature of work done by the force? State reason. List two examples of such a situation
The work done by the force is negative because this force acts opposite to the direction of movement of the body, thereby hindering the motion. Example: 1. Work done by the force...
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An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity?
Yes. Even when an object experiences a net zero external unbalanced force, it is possible that the object is travelling with a non-zero velocity. This is possible only when the...
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According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force.
The truck has a large mass. Therefore, the static friction between the truck and the road is also very high. To move the car, one has to apply a force...
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Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?
(c) It always goes away from the earth
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If there is no external force acting on a nonrigid body, which of the following quantities must remain constant ?
(a) angular momentum (b) linear momentum Explanation: If L be the angular momentum, then external torque = dL/dt But given that it is zero, so dL/dt =0 →L = a constant. Similarly, it can be shown that...
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If there is no external force acting on a nonrigid body. which of the following quantities must remain constant?
(a) angular momentum (b) linear momentum Explanation: If L be the angular momentum, then external torque = dL/dt But given that it is zero, so dL/dt =0 →L = a constant. Similarly, it can be shown...
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