Question

15. What is the kinetic energy of an object? Write an expression for the kinetic energy
of an object.​

Answer 1

• Kinetic Energy is the energy present in a moving body by virtue of it's motion.

• If a particle of mass "m" is moving with a velocity "v" then the Kinetic Energy or KE is given by: $\large{\red{\bold{\boxed{KE = \dfrac{1}{2}m {v}^{2}}}}}$

• This expression holds true even when Force applied varries in magnitude or direction.

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Know More:

• It's a scaler quantity
• It's Dimensions : ${M}^{1} {L}^{2} {T}^{ - 2}$
• SI unit: Joule
• KE can never be negative
• It depends on frame of reference

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Work- Kinetic Energy Theorem:

This theorem states that work done by all the forces acting on a object is equal to the change in it's Kinetic Energy.

it's given by,

$W = \Delta \: KE = \dfrac{1}{2} m {v}^{2} - \dfrac{1}{2} m {u}^{2}$

where

• u= initial velocity of the object
• v = final velocity
• m= mass of the object

Answer 2

Answer

• Kinetic Energy is the energy present in a moving body by virtue of it's motion.

• If a particle of mass "m" is moving with a velocity "v" then the Kinetic Energy.

• This expression holds true even when Force applied varries in magnitude or direction.

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• Know More:

It's a scaler quantity

It's Dimensions :

SI unit: Joule

KE can never be negative

It depends on frame of reference