Moving from a state of rest, a car weighing 1.5 tons reached a speed of 30 m / s 20 s after the start of movement. Determine the thrust force of the vehicle engine.
m = 1.5 t = 1500 kg.
t = 20 s.
V0 = 0 m / s.
V = 30 m / s.
If the force of resistance to motion is neglected, then according to 2 Newton’s law, the thrust force F of the engine will be the product of the mass of the car m and its acceleration a: F = m * a.
Since the car increases its speed from V0 to V in time t, then its acceleration is expressed by the formula: a = (V – V0) / t.
The formula for determining the traction force of a car will take the form: F = m * (V – V0) / t.
F = 1500 kg * (30 m / s – 0 m / s) / 20 s = 2250 N.
Answer: when driving, the traction force of the car is F = 2250 N.
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