Question

The net force of the friction on the rear wheel due to the road is:

• A. $100N$
• B. $62N$
• C. $32.6N$
• D. $18.3N$`

Answer 1

The correct option is D $18.3N$`

First, apply torque balance equation on sprocketed ,pedal w.r.t its centre,
$T\left(10\right)=100\left(16\right)$ {let T be tension in chain}
$\Rightarrow T=160N$
Now apply for rear wheel,
$f\left(35\right)=T\left(4\right)$ {let f be friction force}
$\Rightarrow f=\frac{160\left(4\right)}{35}$
$\Rightarrow f=18.286N=18.3N(approx.)$
Therefore, answer is Option D