A body is under the action of the equal and opposite forces, each of 5 N.The body is displaced by 2m.The work done is

The work done on a body does not depend upon the

A body at rest can have

Ns is equivalent to

A body is acted upon by a force which is inversely proportional to the distance covered (S).The work done will be proportional to

A body is dropped from a certain height above the ground.When it is half way down, it possesses

Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Define 1J of work.

State two factors on which the kinetic energy of a moving body depends.

What change should be affected in the velocity of a body to maintain the same kinetic energy if its mass is increased four times?

Two bodies of equal masses move with uniform velocities of 2v and 3v respectively.Find the ratio of their kinetic energies.

Calculate the kinetic energy of a ball of mass 10 g and momentum 100 g cm/s.

Find the momentum of a body of mass 100g having kinetic energy of 20J.

Define the term energy.Give some examples of bodies possessing some energy.

A light and a heavy object have the same momentum.Find out the ratio of their kinetic energies.Which one has a large kinetic energy?

Name and define the SI unit of power.Give some bigger units of power.

Define 1 watt of power.

A household has a 100 W lamp lighted for 2 hours, two 60 W lamps lighted for 4 hours and an electric fan of 50W working for 8 hours a day.Calculate the electric units consumed each day.

Define the term work.State the conditions that need to be satisfied for work to be done.Give some situations in which work is done.

Write the various energy transformations that occur in the following cases:
(a) Moving a car
(b) Going up in an escalator
(c) Rotating of an electric motor
(d) Release of an arrow from a bow
(e) Lighting of an electric bulb
(f) Tuning of an FM radio receiver
(g) Gas stove burner.

(i) A battery lights a bulb.Describe the energy changes involved in the process.
(ii) Calculate the amount of work needed to stop a car of 500 kg moving at a speed of 36 kmh^-1.