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Mechanics Question Help

Hey guys, how do I know the friction force is acting upwards? Is it because the crate is trying to move down? Initially I thought the friction force opposed force F. Thanks guysimage.jpgimage.jpg
(edited 1 year ago)
Friction always opposes the direction of motion. The crate is held at rest by a force acting upwards meaning it’s on the point of moving down.
(edited 1 year ago)
Reply 2
Original post by Driving_Mad
Friction always opposes the direction of motion.

Ok thanks. So this is the case regardless of force F?
Reply 3
Original post by Driving_Mad
Friction always opposes the direction of motion. The crate is held at rest by a force acting upwards meaning it’s on the point of moving down.

Thanks so much! That has cleared everything up.

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