When a car of mass 1200 kg, going with speed 30 m/s, rounds an unbanked curve of radius 150 m, what is the minimum coefficient of static friction LaTeX: \left(\mu_s\right)( μ s ) needed to ensure that it does no skid?

Explanation:

In order for the car does not slip, the frictional force must be equal to the centripetal force due to the circular motion. According to the free body diagram:

The frictional force is given by:

The centripetal force is defined as:

Here v is the linear speed and r is the radius of the circular motion. Replacing this equations:

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

it is b. absorbs thermal energy