Question

When a car moves around in a circle, the force that allows the car to keep moving in a
circle is static friction. If 1000 kg car moves at 45 m/s around a loop with a radius of 60
m, what static friction force does it experience?

Answer 1

When a car moves around in a circle, the static friction force that it experience is Centripetal force.

Centripetal force is a type of force directed towards the center of the circle when an object moves in circular motion. The centripetal force allows an object to keep moving in a  circle.

Centripetal force is directly proportional to velocity squared of the object. It is given by:

F = mv²/r

m = mass, v = velocity, r = radius, F = centripetal force.

Given that m = 1000kg, v = 45 m/s, r = 60 m, hence:

F = 1000(45)²/60 = 33750 N

When a car moves around in a circle, the static friction force that it experience is Centripetal force.

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