Assertion: Work done by friction force may be positive. Reason: Force of friction always opposes

step 1 The work done by the friction can be positive. The work done by the friction is defined as the f

Assertion: Work done by friction force may be positive....

Key Concepts

Work

Work is a measure of energy transfer that occurs when a force is applied to an object and causes displacement. It is calculated as the dot product of the force vector and the displacement vector, meaning that work can be positive, negative, or zero depending on the direction of the force relative to the displacement.

Friction

Friction is a resistive force that arises when two surfaces interact. It generally acts to oppose the relative motion between the surfaces. While friction is usually seen as a force that dissipates energy (negative work), under certain conditions it can contribute positively by aiding in processes like acceleration in rolling objects.

Relative Motion

Relative motion describes the movement of one object with respect to another. The nature of friction is closely tied to relative motion, as frictional forces are generated at the interface of surfaces that move or attempt to move relative to each other.

Static and Kinetic Friction

There are two primary types of friction: static and kinetic. Kinetic friction occurs when objects slide past each other and typically does negative work since it opposes motion. Static friction, on the other hand, acts when there is no sliding between surfaces and can, in certain situations, perform positive work, such as providing the necessary force for a wheel to roll forward without slipping.

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