In which of the following does the work done by a body against friction always result in?

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Loss of kinetic energy

Loss of potential energy

Gain of kinetic energy

Gain of potential energy

answer is A.

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Detailed Solution

Concept- In this section, we shall define the term work, which is commonly used in physics. The frictional force will then be defined. Finally, we will look at how the frictional force affects the motion of the body on which it acts. Work is the measurement of the transfer of energy that occurs when an object is moved over a distance by an external force, at least a portion of which is applied in the direction of displacement. Work can be calculated if the force is constant by multiplying the path length by the force component acting along the path.
The work W is equal to the force F multiplied by the distance d, i.e., W = Fd. The work done is determined by the formula if the force is applied at an angle θ to the displacement.
W= Fdcosθ
Friction is a force that exists between two sliding surfaces or surfaces that try to glide over each other. When trying to move a book across the floor, for example, friction makes this difficult. Friction always acts in the opposite direction as the thing moves or attempts to move. Friction frequently slows down a moving object.
The degree of friction is determined by the materials used to construct the two surfaces. The greater the amount of friction produced, the rougher the surface. Friction generates heat as well. You'll notice that your hands are getting warmer if you swiftly rub them together. Friction is a helpful force because it protects our feet from sliding down the pavement and car tyres from skidding down the lane as we walk. When you walk, friction occurs between the tread on your shoes and the ground. This friction is helpful at gripping the ground and keeping you from sliding.
Friction is also opposed to motion. A body works by expending its kinetic energy against friction. As a result, all work done by a body against friction always results in kinetic energy loss. As a result, all work done by a body against friction always results in kinetic energy loss.
Hence, option 1 is the correct answer.

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