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Work Energy and Power
On what factor does the position of the centre of gravity of a body depend?
The position of center of gravity of a body of given mass depends on its shape, i.e., on the distribution of mass in it.
How is work done by a force measured when the force:
i) is in the direction of displacement
i) Work done by a force when the force is in the direction of displacement.
That is equal to Force x Displacement of the point of application of the force in the direction of force.
ii) Work done by a force when the force is at an angle θ to the direction of displacement ,
= Force x component of displacement in the direction of force.
= Force x d cosθ
State the energy changes in the following while in use:
i) Burning of a candle
ii) A steam engine
Energy changes:
i) Burning of a candle: Chemical energy to light energy.
ii) Steam Engine: Chemical energy of the coal first changes to heat energy of steam and then heat energy changes into mechanical energy.
Explain the motion of a planet around the sun in a circular orbit.
A planet moves around the sun in a circular path for which the gravitational force of attraction on the planet by the sun provides the necessary centripetal force. This centripetal force is always directed towards the centre of the sun at each point of its path which is responsible for the circular motion of a planet.
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Mock Test Series
Mock Test Series