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State the conditions of equilibrium for a rigid body.
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A uniform circular motion is an accelerated motion. Justify it.
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Explain the difference between a uniform linear motion and a uniform circular motion.
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Is the motion of moon around the earth in circular path an accelerated motion?
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Does the earth move around the sun with a uniform velocity?
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Name the force acting away from the centre of circular path.
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What is the purpose of a machine?
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Give an example for each of the following uses of a machine:
to obtain gain in force,
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Work is the application of a ....... through a distance.
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A boy does work when he pushes against a brick wall. (yes/no).
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What is the SI unit of work?
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Nm is the unit of .......
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What is the work done when the object acted upon by a force remains at rest?
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Is work done a scalar or a vector physical quantity?
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A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?
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What is the work done against gravity when a body is moved horizontally along a frictionless surface?
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