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Which of the following has the same unit as energy?
1. Work
2. Torque
3. Momentum
4. Both 1 and 2

1 Answer

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Best answer
Correct Answer - Option 4 : Both 1 and 2

The correct answer is Both 1 and 2.

CONCEPT:

Energy:

  • It is defined as the capacity of doing work.
  • It is a scalar quantity.
  • Its unit is Joule or N-m.


EXPLANATION:

Work:

  • The work is said to be done by a force on a body if the force applied causes a displacement in the body.
  • It is a scalar quantity.
  • Its unit is Joule or N-m.


Torque:

  • Torque is the measure of the force that can cause an object to rotate about an axis.
  • Torque causes an angular acceleration. Hence, torque can be defined as the rotational equivalent of linear force.
  • It is a vector quantity.
  • Its unit is N-m.


Linear Momentum:

  • The linear momentum of a body is the quantity of motion contained in the body.
  • It is measured as the product of the mass of the body and its velocity.
  • It is a vector quantity.
  • Its unit is kg-m/sec.
  • So we can say that both the work and the torque have the same unit as energy. Hence, option 4 is correct.

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