question_answer1) Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion : On a rainy day, it is difficult to drive a car or bus at high speed. Reason : The value of coefficient of friction is lowered due to wetting of the surface.
question_answer2) Assertion : When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is always in forward direction. Reason : The frictional force acts only when the bodies are in contact.
question_answer3) Assertion : Pulling a lawn roller is easier than pushing it. Reason : Pushing increases the apparent weight and hence the force of friction.
question_answer4) Assertion : Angle of repose is equal to angle of limiting friction. Reason : When the body is just at the point of motion, the force of friction in this stage is called as limiting friction.
question_answer5) Assertion : Two bodies of masses M and m (M > m) are allowed to fall from the same height if the air resistance for each be the same then both the bodies will reach the earth simultaneously. Reason : For same air resistance, acceleration of both the bodies will be same.
question_answer6) Assertion : Friction is a self-adjusting force. Reason : Friction does not depend upon mass of the body.
question_answer7) Assertion : The value of dynamic friction is less than the limiting friction. Reason : Once the motion has started, the inertia of rest has been overcome.
question_answer8) Assertion : The acceleration of a body down a rough inclined plane is greater than the acceleration due to gravity. Reason : The body is able to slide on a inclined plane only when its acceleration is greater than acceleration due to gravity.
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