Question

A firefighter of mass 81 kg slides down a vertical pole with an acceleration of 3 m/s 2 . The acceleration of gravity is 10 m/s 2 . What is the friction force that acts on him? Answer in units of N

Answer 1

The force of friction that acts on him is

`F_k=567N`

Step-by-step explanation:

The firefighter with an acceleration of 3m/s^2 take the gravity acceleration as 10m/s^2 isn't necessary to know the coefficient of friction just to know the force of friction:

`F=m*a`

`F=F_w-F_k`

`m*a=F_w-F_k`

`F_w=81kg*10m/s^2=810N`

Sole to Fk

`81kg*3m/s^2=810N-F_k`

`F_k=810N-243N`

`F_k=567N`