4 Distinguish between
(a) Energy and power (b) Kinetic energy and potential energy
(e) Work and energy (d) Work and power
Answers
a) Energy and power :-
E- Energy is a thing that helps in carrying out mostly all processes on earth, to support life.
E.g. - Light energy helps for photosynthesis and we are dependent on plant, so energy supports life in this way
P- Power is the efficiency or say the strength of energy to do a work.
E - Energy cannot be created not destroyed, it can be converted into one form to another.
P -Power can not be converted into other form.
E - According to law of conservation of energy, energy can be conserved.
P - Power cannot be conserved.
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b) Kinetic energy and potential energy :-
K - Kinetic energy is the energy shown by an object due to its motion.
P - Potential energy is an energy In an object due to its position.
K - Kinetic energy is measured with one reference point, e.g - we only take mass and velocity but not other point related.
P - Potential energy is measured with two reference point. e.g - we measure height of object with respect to ground level.
K - We can transfer kinetic energy of an object to other.
P - We cannot transfer potential energy of an object to other.
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c) Energy and work
E - Energy is the ability of a body to do work.
W - Work is done when it displaces something by help of energy.
E - There are different types of energy and all have their own separate calculating methods.
W - Work is of only one type, it is calculated by the product of force and displacement.
E - Energy is a scalar quantity
W - Work is a vector Quantity.
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d) Work and power
W - is done when energy is Transferred
P- is the rate of supply of energy.
W - Work is measures in joules.
P - is measured in Watts.
W- Work is product of force and displacement.
P - Power is ratio of work to time.
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BY SCIVIBHANSHU
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