Question

Applied force is 335N is used to get a chair moving on a surface with a coefficient of kinetic friction 0.330. If the object is accelerating at 0.722m/s/s, whats it's mass?

Answer 1

Correct answer: m = 83.29 kg

Step-by-step explanation:

According to Newton's second law, the movement of the chair is:

F - Ffr = m · a => F - k m g = m a => F = k m g + m a => m (k g + a) = F

If we take that g = 10 m/s² then we get

m = F / k g + a = 335 / 0.33 · 10 + 0.722 = 83.29 kg

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