Mechanics Question
How do I know which direction friction is facing? Here, I thought it would be facing the right because if friction was removed, the plank would be lifted up and the bottom part of the plank would move left? Thanks.
(edited 11 months ago)
Original post by Har6547
How do I know which direction friction is facing? Here, I thought it would be facing the right because if friction was removed, the plank would be lifted up and the bottom part of the plank would move left? Thanks.
The rod will tend to move to the right so friction opposes that.
Original post by Muttley79
The rod will tend to move to the right so friction opposes that.
But wouldn't the force pulling it cause it to tend towards moving left?
Original post by Har6547
But wouldn't the force pulling it cause it to tend towards moving left?
No - try it ...
Original post by Muttley79
No - try it ...
Is it because the force T only has a horizontal component facing right, not left? So it only pulls it right?
(edited 11 months ago)
Original post by Har6547
Is it because the force T only has a horizontal component facing right, not left? So it only pulls it right?
Yes
Original post by Muttley79
Yes
That makes a lot more sense now, thanks
Original post by Har6547
That makes a lot more sense now, thanks
Seriously if in doubt get a stick and string and try it ... there's no force acting to the left.
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