What is the friction force between the body and the horizontal surface, if the kinetic energy of the body increased by 30 J
| February 18, 2021 | education
What is the friction force between the body and the horizontal surface, if the kinetic energy of the body increased by 30 J per 5m displacement, which coincides in the direction with the force 8N?
To calculate the value of the friction force between the displaced body and the horizontal surface, we will use the equality: A = ΔEk and ΔEk = Fр * S = (F – Ftr) * S, whence we express: Ftr = F – ΔEk / S.
Values of variables: F – driving force (F = 8 N); ΔEk – increase in kinetic energy (ΔEk = 30 J); S – displacement (S = 5 m).
Calculation: Ftr = F – ΔEk / S = 8 – 30/5 = 2 N.
Answer: The friction force acting on the displaced body was 2 N.
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