Work Energy | MCQs

Explanation

The dimension of work is like the dimension of Torque.             

Both work and torque have the same dimensional formula: [ML²T⁻²]

However, they are physically different quantities:  

- Work is a scalar (dot product of force and displacement).  

- Torque is a vector (cross product of force and radius).  

Explanation

The area under a force–displacement graph gives the work done by the force.

This is because Work = Force × Displacement, graphically represented by the area.

Explanation

When θ = 0°, the force and displacement are in the same direction, and the work done is maximum.

The formula simplifies to W = F ⋅ d, meaning all the force contributes to the displacement.

Explanation

Centripetal force acts perpendicular to the direction of motion in circular motion.

Since work = force × displacement × cos(θ), and θ = 90°, the work done is zero.