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# Tag Archives: brakes

## A Problem based on Friction

an unloaded bus can be stopped by applying **brakes** on straight road after covering a **distance** x. Suppose, the passenger add 50% of its **weight** as the load and the braking **force** remains uncharged, how far will the bus go after the application of **brakes**? (**velocity** of bus in both case is same)

## A simple numerical on momentum

**Car mass is 1200 kg moving velocity is 108 km/hr. On applying brakes velocity reduced to 36 km/hr. Find change in momentum?**

*(posted by Aditi)*

Answer:

m=1200 kg

u=108 x 5/18=30m/s

v=36×5/18=10m/s

Change in momentum = m(v-u) = 1200 x (30-10)=1200 x 20= __24000 kg m/s__

## Numerical Problem from Friction

“The friction coefficient between a road and the tyre of a vehicle is 4/3.find the maximum incline the road may have so that once hard brakes are applied and the wheel starts skidding,the vehicle going down at a speed of 10m/s is stopped within 5m” Raju Rabha asked