A car with a mass of 1.2 tons, moving at a speed of 10 m / s, when the brakes are applied, stops after 5 s
| February 28, 2021 | education
A car with a mass of 1.2 tons, moving at a speed of 10 m / s, when the brakes are applied, stops after 5 seconds. Determine the force inhibiting its movement.
m = 1.2 t = 1200 kg.
V0 = 10 m / s.
V = 0 m / s.
t = 5 s.
Ftor -?
When braking in the horizontal direction, the braking force Ftor acts, which is directed in the opposite direction of the vehicle’s movement.
Ftor = m * a – 2 Newton’s law.
The acceleration of the car during braking and we express the formula: a = (V0 – V) / t.
Ftor = m * (V0 – V) / t.
Ftor = 1200 kg * (10 m / s – 0 m / s) / 5 s = 2400 N.
Answer: the braking force that acts on the car when driving is Ftor = 2400 N.
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