Question

Lesson:-Work And Energy:-Define Kinetic energy. Write the expression for Kinetic energy.​

Answer 1

Answer:

kinetic energy is an energy which a body possessed by virtue of being in motion. If an object of mass m is moving with a velocity v,then it's kinetic energy Ek is given by the expression,Ek=1/2mv^2. The S.I unit of kinetic energy is joules (j).

Explanation:

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Answer 2

Answer:

kinetic Energy

The energy of a body due to its motion is called Kinetic energy. The kinetic energy of a moving body is measured by the amount of work it can do before coming to rest . Mass of body is doubled ,its kinetic energy also gets doubled and if the mass of a body is halved, its kinetic energy also gets halved. kinetic energy of a body is directly proportional to the square of its velocity . If the velocity of a body is doubled the kinetic energy becomes four times and if the velocity of a body is halved then its kinetic energy becomes one - fourth . The kinetic energy of a body depends upon its mass and velocity . Therefore heavy body moving with high velocities have both kinetic energy than slowing moving bodies of small mass. this is the reason why a blacksmith uses heavier hammer than the one used by a goldsmith .

Kinetic Energy =

\frac{1}{2} \times m \times {v}^{2}

2

1

×m×v

2

From this mathematical formula, It is clear that :

The kinetic energy of a body is directly proportional to the mass of the body.

The kinetic energy of a body is directly proportional to the square of velocity of the body or square of the speed of the body.

SI unit for kinetic energy is Joules.

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