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Displacement

Assertion : T...

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Assertion : The work done in bringing a body down from the top to the base along a frictionless inclined plane is same as the work done in bringing it down the vertical side. Reason :The gravitation force on the body along the inclined plane is the same as that along the vertical side

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Q. Assertion :Work done by friction on a body sliding down an inclined plane is negative Reason: Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.

The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:

(a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

(b) work done by gravitational force in the above case,

(c) work done by friction on a body sliding down an inclined plane,

(d) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity,

(e) work done by the resistive force of air on a vibrating pendulum in bringing it to rest.

Q. Assertion :More force is required to push a body up a rough inclined plane than that to move the same body down the same plane Reason: The friction always acts parallel to inclined plane downwards

Q. When a body of mass

m

slides down from the top of a smooth inclined plane of length

L

and inclination

θ

, the work done by the gravitational force on the body is (Given acceleration due to gravity

= g

Q. The work done is vertically raising a body of mass M through a distance b is given to be W. If the same body of mass M is raised to the same vertical height b by pulling it up along a plane inclined at an angle theta with the horizontal, then the work done in this case is?

1

. A function of force applied along the plane

2

. A function of M

cos θ

3

. A function of g

sin θ

, g being acceleration due to gravity

4

. The same value W
Which of the given are correct? Choose the answer from the codes given.

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