Under the action of a certain force, a body with a mass of 4 kg passed for 1 min
July 22, 2021 | education
| Under the action of a certain force, a body with a mass of 4 kg passed for 1 min on a horizontal surface of 15 m. The sliding friction coefficient is 0.2. Find useful body power while moving.
The work done by the friction force will be equal to:
A = F * S, where F is the friction force, S is the distance.
The friction force is determined by the formula:
F = η * m * g, where η is the coefficient of friction, m is the mass, g is the acceleration of gravity.
By definition, the power is determined by the formula:
P = A / t, where A is work, t is time.
Then we get:
P = η * m * g * S / t.
Time must be expressed in seconds 1 minute = 60 seconds.
P = 0.2 * 4 * 10 * 15/60 = 2 W.
Answer: the required power was 2 W.
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