Question

A disc of mass M kg and radius R metre is rotating at an angular speed of w rad/s when the motor is switched
off. Neglecting the friction at the axle, the force that must be applied tangentially to the wheel to bring it to
rest in time t is​

Answer 1

Answer:

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Answer 2

ANSWER

Let force be F and radius be R

∴Torque=Iα

FR=

2

MR

2

​

α(I=

2

MR

2

​

fordisc)

α=

MR

2F

​

This α retards ω to 0

∴

MR

2F

​

=

t

ω

​

←(acceleration=

t

ΔV

​

)

⇒F=

2t

MRω

​