When a body is thrown up , work done by ...

When a body is thrown up , work done by gravity on the body is

zero

negetive

positive

can be negetive or positive

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The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

A body of mass m is moving in a circle of radius r with a constant speed v, The force on the body is (mv^(2))/(r ) and is directed towards the centre what is the work done by the from in moving the body over half the circumference of the circle?

The work done by kinetic friction on a body :

A body is moving up an inclined plane of angle theta with an initial kinetic energy E. The coefficient of friction between the plane and body is mu . The work done against friction before the body comes to rest is

A force of 15 N is required to pull up a body of mass 2 kg through a distance 5 m along an inclined plane making an angle of 30^(@) with horizontal as shown in fig calculate : (i)the work done by the force in pulling the body. (ii)The force due to gravity on the body, (iii)the work done against by the force due to gravity Take :g=9.8 m s^(-2) . (iv)Account for the difference in answers of part (i) and part (iii).

When a body is thrown up in a lift with a velocity u relative to the lift, the time of flight is found to be t . The acceleration with which the lift is moving up is

A body is thrown on a rough surface such that the friction force acting on it is linearly varying with the distance travelled by it as f=ax+b . Find the work done by the friction on the box if before coming to rest the box travels a distance s.

Asseration : In circular motion work done by all the forces acting on the body is zero. Reason : Centripetal force and veloity are mutually perpendicular.

Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.

Assertion In vertical circular motion, speed of a body cannot remain constant. Reason In moving upwards, work done by gravity is negative.

AAKASH INSTITUTE ENGLISH-MOCK TEST 8-Example

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Work done by a spring force is
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