A ball weighing 0.5 kg after a blow of 0.02 s duration acquires a speed of 10 m / s. Determine the average impact force.
| May 9, 2021 | education
m = 0.5 kg.
t = 0.02 s.
V0 = 0 m / s.
V = 10 m / s.
Fср -?
According to Newton’s 2 law, the force Fav, which acts on the ball, is equal to the product of its mass m by the acceleration a, which this force imparts to it: Fav = m * a. Force Fav directed in the same direction as acceleration a.
The acceleration of the body a shows how the speed of the ball changes over time. The acceleration of the ball is expressed by the formula: a = (V – V0) / t.
Fav = m * (V – V0) / t.
Since the ball was initially at rest, then V0 = 0 m / s.
Fav = m * V / t.
Fav = 0.5 kg * 10 m / s / 0.02 s = 250 N.
Answer: the average force of impact on the ball is Fav = 250 N.
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