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find work done by object moving upward on a inclined plane. Explain it fully detail with reson of every thing.

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Q. A man of mass m speeds up while running from rest to a speed v in a straight track along an inclined plane, after rising through a height h.

W_{g r a v i t y}

= work done by gravity on the man.

W_{f r i c t i o n}

= work done by gravity on the man.

W_{m a n}

= work done by man.
If instead of moving up the plane, the man increases his speed to the value v while moving down the inclined plane through the same vertical distance h, then

Q. Work done in moving a body up on an inclined rough plane (

μ

S

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. A block of mass

m

is moving down with constant velocity along an inclined plane of inclination

θ

. What is the work done by external force in pulling the block along the inclined plane through a height

h

with constant velocity?

Q. Assertion :Work done in moving a body over a smooth inclined plane does not depend upon slope of inclined plane, provided its height is same Reason:

W = m g h = m g l s i n θ

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