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Earn 100

Which of the following is not true about Frictional force?
(a)Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces it.
(b)Friction is the force which opposes the relative motion of two surfaces in contact
(c)The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction
(d)Friction in machines wastes energy and also causes wear and tear

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Important Questions on Physics
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Which among the following is the correct statement?
A. When an object is thrown upwards, then in any case whether going upwards or coming downwards its speed will remain the same.
B. The weight of any object cannot be zero.

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a. bullet from the gun.
b. a railway engine at a fast speed.
c. the motion of an ordinary pendulum.

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What is the energy possessed by a body due to its motion is called?


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A particle in the medium completes 40 vibrations in 2.5 s. The frequency of the wave is ____:

