Question

What is the μ of between a 520 kg wooden crate and the concrete ramp (15º) that it is sitting on?

Answer 1

Answer on Question #48098, Physics, Mechanics | Kinematics | Dynamics

What is the $\mu$ of between a $520\mathrm{kg}$ wooden crate and the concrete ramp (15°) that it is sitting on?

Solution.

$1^{\mathrm{st}}$ Newton's law:

$$\sum \vec {F} = 0$$ $$m g \cdot \cos \alpha = N$$ $$m g \cdot \sin \alpha = F _ {f}$$ $$F _ {f} = \mu N$$

So:

$$m g \cdot \sin \alpha = \mu m g \cdot \cos \alpha$$ $$\mu = \tan \alpha = \tan 1 5 {}^ {\circ} \approx 0. 2 7$$

Answer: $\mu \approx 0.27$

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