Question

Work done by force of friction: (a) can be positive (b) can be negative (c) can be zero (d) any of thesc

   Work done by force of friction:
(a) can be positive
(b) can be negative
(c) can be zero
(d) any of thesc

Practice Problem in Physics for the JEE Main and Advanced

Practice Problem in Physics for the JEE Main and Advanced

Abhay Kumar 2015 Edition

Chapter 5, Problem 17

Instant Answer

Solved by Expert Prabhu Ramji

01/20/2022

Step 1

Step 1: The work done by any force is given by the formula $W = F \cdot d \cdot cos(\theta)$, where $W$ is the work done, $F$ is the force, $d$ is the displacement, and $\theta$ is the angle between the force and the displacement. Show more…

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Work done by force of friction: (a) can be positive (b) can be negative (c) can be zero (d) any of thesc

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Key Concepts

Work

Work is the energy transferred to or from an object when a force is applied along a displacement. It is mathematically defined as the dot product of the force vector and the displacement vector, which means that the sign and magnitude of the work depend on the angle between these two vectors. This concept is fundamental in understanding how forces cause changes in an object's energy.

Friction

Friction is a force that opposes the relative motion between two surfaces in contact. It plays a critical role in energy transfer, as it can do work on moving objects. Depending on the situation, friction may result in negative work when it dissipates kinetic energy, zero work if there is no relative motion (as in the case of static friction in certain scenarios), or occasionally positive work when the direction of friction aligns with the displacement under specific conditions.

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