First slide

Force

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 is tension in the string and mg is gravitational force on the particle then, the actual forces acting on the particle are

Moderate

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

Solution

When the observer is on the ground (inertial frame) , real forces mg and T , only act on the particle.
When the observer is on the particle itself (non-inertial frame) pseudo force (mv²/l) appears to be acting on the particle , also real forces mg and T act on the particle.

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