Question

A rectangular block is placed on a rough
horizontal surface in two different ways as shown, then
(a) friction will be more in case (a)
(b) friction will be more in case (b)
(c) friction will be equal in both the cases
(d) depends on the relations among its
dimensions

Answer 1

Answer:

c)friction will be equal in both the cases

friction doesn't depend on area of contact

Explanation:

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Answer 2

A rectangular block is placed on a rough horizontal surface in two different rough horizontals then (c) friction will be equal in both the cases.

• The friction force is the force that helps in the motion of objects due to resistance provided at the contact of two surfaces.
• Frictional will be equal in both cases because frictional force depends on a normal reaction which is mass × gravitational acceleration. f = uN = u×mg. here, u is the coefficient of friction.
• Frictional forces are of three types static, sliding and rolling.
• It acts in the opposite direction of applied force.
• The tearing of machine parts is due to the heat produced when friction force comes into play.
• Aeroplane flying is possible due to friction.
• Fixing of nails in the wall is also due to friction developing at the contact.