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प्रश्न
What are the two kinds of mechanical energy?
What are the two forms of mechanical energy?
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उत्तर
Two kinds/forms of mechanical energy:
- The Potential Energy (P.E.)
- The Kinetic Energy (K.E.)
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
State two conditions when no work is done by a force.
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(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
Name the forms of energy which a wound-up watch spring possesses.
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
What do you mean by degradation of energy?
Define 1 joule of work.
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
Name the force acting away from the centre of circular path.
Write an expression for work done by a force depends?
A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
