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Relative Motion

Question 10 W...

Question

Question 10
Will force of friction come into play when a rain drop rolls down a glass window pane?

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Solution

Yes, because there is a contact between window and rain drop. Hence, friction will act on the rain drop as it moves downward.

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Q. When a rolling body moves along an inclined plane, frictional force acts at the point of contact so as to either prevent the relative sliding or oppose the relative sliding. In the case of a rolling body when projected up or down along the inclined plane or spun with some angular speed and kept on the inclined plane, kinetic force of friction comes into play. If we release the body from rest and the angle of inclination

θ (θ_{0})

θ_{0}

= minimum angle for which pure rolling can be established, static force of friction comes into play. For instance, let the body (a solid uniform m sphere of mass m, say) be spun with

ω_{0} ↓

and kept on the inclined plane.
The minimum coefficient of friction for which the sphere will have pure rolling after some time for

θ = 45^{\circ}

Q. A force between two objects come into play when

Q. The maximum frictional force that comes into play when a body just begins to slide over the surface of another body is known as:

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Relative Motion

Standard VIII Physics

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