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Alexus [3.1K]
3 years ago
14

Which sentence correctly describes a friction force? A. It acts in the same direction as the motion of an object. B. It acts in

a direction opposite to the motion of an object. C. It acts in the same direction as the force of gravity on an object. D. It acts in a direction perpendicular to the motion of an object.
Physics
1 answer:
KatRina [158]3 years ago
5 0

Answer:

B

Explanation:

Friction acts in a direction opposite to the motion of an object

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Answer:

\mu_s = 0.62

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F = mg\sin(\theta) - \mu_k mg\cos(\theta)\\1.7m = mg\sin(31.8) - \mu_k mg\cos(31.8)\\1.7 = (9.8)\sin(\theta) - mu_k(9.8)\cos(\theta)\\mu_k = 0.415

As for the static friction, we will consider the angle 31.8, but just before the block starts the move.

mg\sin(31.8) = \mu_s mg\cos(31.8)\\\mu_s = tan(31.8) = 0.62

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</span>
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