Question

We have a car (1,354 kg) on a level surface with a constant velocity (v 26 m/s) with u -0.75 μ,-0.67). The driver sees a tortoise crossing the road and hits the brakes. Hint: Compare how much frictional force the wheels have with the ground in each case. 1. Determine the car's minimum braking distance with normal brakes (non-abs), assuming the driver slams on the brakes as hard as they can 2. Determine the car's minimum braking distance, this time with antilock brakes. How do these two methods of stopping a car compare? Calculate the ratio of abs stopping distance to the non-abs stopping distance. Please interpret your results from parts (1) and (2) to explain why modern cars tend to come equipped with antilock brakes as a standard safety feature. 3.

Answer 1

The normal brakes and the abs abs has a major working difference. In normal brakes, the wheels of the car lock down and the car tends skidding or slipping in the road. Hence, static friction works here to calculate the minimum distance of stopping. Where as, in abs, the brakes dont lock the wheels, instead they roll and move but with a lesser speed and hence the kinetic friction works here.