Question:

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A): Frictional forces are conservative forces. 

Reason (R): Potential energy can be associated with frictional forces.

In the light of the above statements, choose the correct answer from the options given below

Updated On: Apr 3, 2023
  • If both assertion and reason are true and reason is the correct explanation of assertion
  • If both assertion and reason are true but reason is not the correct explanation of assertion
  • If assertion is true but reason is false
  • If both assertion and reason are false
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The Correct Option is D

Solution and Explanation

Forces that cannot be attributed to the energy content of any body are called as non conservative forces. Friction cannot be attributed to the energy content in any body. Thus A is wrong. Also the potential energy is the energy by virtue of its position under gravity or any force field. It is a conservative force and cannot be associated with frictional forces. Thus the second statement is also wrong.
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Concepts Used:

Work, Energy and Power

Work:

  • Work is correlated to force and the displacement over which it acts. When an object is replaced parallel to the force's line of action, it is thought to be doing work. It is a force-driven action that includes movement in the force's direction.
  • The work done by the force is described to be the product of the elements of the force in the direction of the displacement and the magnitude of this displacement.

Energy:

  • A body's energy is its potential to do tasks. Anything that has the capability to work is said to have energy. The unit of energy is the same as the unit of work, i.e., the Joule.
  • There are two types of mechanical energy such as; Kinetic and potential energy.

Read More: Work and Energy

Power:

  • Power is the rate at which energy is transferred, conveyed, or converted or the rate of doing work. Technologically, it is the amount of work done per unit of time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines is demonstrated in terms of Horsepower (hp), which is roughly equal to 745.7 watts.
  • Power is a scalar quantity, which gives us a quantity or amount of energy consumed per unit of time but with no manifestation of direction.