A force F is used to pull a 50 kg block, as shown in figure. Determine the magnitude and direction of the friction force when F = 400 N.

A force F is used to pull a 50 kg block, as shown in figure. Determine

1.	A force F is used to pull a 50 kg block, as shown in figure. Determine the magnitude and direction of the friction force when F = 400 N.
A.	45 N up the plane
B.	80 N up the plane
C.	45 N down the plane
D.	80 N down the plane
Answer» D. 80 N down the plane

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A force F is used to pull a 50 kg block, as shown in figure. Determine the magnitude and direction of the friction force when F = 400 N.

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