A 1,120-N crate is being pushed across a level floor at a constant speed by a force
1 answer:
Answer:
μ ≈ 0.238
a ≈ 0.441 m/s²
Explanation:
a) F = ma (a = 0 constant velocity)
Fcosθ - μN = 0
μ = Fcosθ / N
μ = Fcosθ / (mg + Fsinθ)
μ = 310cos20 / (1120 + 310sin20)
μ = 0.2376007... ≈ 0.238
b)
Fcosθ - μN = ma
a = (Fcosθ - μN) / m
a = (Fcosθ - μ(mg - Fsinθ) / m
a = (310cos20 - 0.2376(1120 - 310sin20) / (1120/9.81)
a = 0.441308... ≈ 0.441 m/s²
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