Question

A particle of mass m is tied to a light string and rotated with a speed v along a circular path of radius r. If T = tension in the string and mg = gravitational force on the particle then the actual forces acting on the particle are

• A. Mg and T only
• B. Mg, T and an additional force of mv²/r directed inwards
• C. Mg, T and an additional force of mv²/r directed outwards
• D. Only a force mv²/r directed outwards

Answer 1

Answer: (A)

Mg and T only

Answer 2

The force mv²/r directed outwards, called centrifugal force, is not a real force

At A, mv₁²/l = T₁ + mg.