Question: how to find the centripetal acceleration?
Answer: ΔvΔt=vr×ΔsΔt Δ v Δ t = v r × Δ s Δ t . ac=v2r a c = v 2 r , which is the acceleration of an object in a circle of radius r at a speed v. So, centripetal acceleration is greater at high speeds and in sharp curves (smaller radius), as you have noticed when driving a car.