A car with a mass of 4 tons moving at a speed of 54 km / h braked and stopped after passing a distance of 45 m
| August 15, 2021 | education
A car with a mass of 4 tons moving at a speed of 54 km / h braked and stopped after passing a distance of 45 m. Find the frictional force of sliding tires of a car on the surface of the Earth.
To find the magnitude of the tire sliding friction force, we use the formula: Ftr = Atr / S = m * Vn ^ 2 / 2S.
Variable values: m – mass (m = 4 t = 4000 kg); Vн – the speed of the presented car before braking (Vн = 54 km / h = 15 m / s); S – distance traveled (S = 45 m).
Calculation: Ftr = m * Vn ^ 2 / 2S = 4000 * 15 ^ 2 / (2 * 45) = 900000/90 = 10 * 10 ^ 3 N.
Answer: The sliding friction force of the tires, according to the calculation, is 10 kN.
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