Frictional Forces | MCQs

Explanation

Upthrust (or buoyant force) happens only when a body is physically in contact with a liquid.

Electrostatic magnetic force between two magnets, and gravitational forces act at a distance without contact.

Explanation

Friction always acts opposite to the direction of motion, resisting movement.

Since work = force × displacement × cos θ, and θ = 180°, cos 180° = –1, so work is negative.

Explanation

Frictional force is a non-conservative force.

Unlike conservative forces (such as elastic spring force, gravitational force, and electric force), friction dissipates energy as heat and does not store it.

It means the work done by friction depends on the path taken.