What is the static friction force acting on a 70 kg person running on the road if the coefficient of friction is 0.5?
| November 16, 2020 | education
m = 70 kg.
g = 9.8 m / s ^ 2.
μ = 0.5.
Ftr -?
Decision
The static friction force Ffr is determined by the formula: Ftr = μ * N, where μ is the friction coefficient, N is the support reaction force.
The support reaction force N is determined by the formula: N = m * g.
Ftr = μ * m * g.
Ftr = 0.5 * 70 kg * 9.8 m / s ^ 2 = 343 N.
Answer: the static friction force is Ftr = 343 N.
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