The Student Room Group

Friction M1




Why have they modeled the friction going up the plane, but then resolved as if it was going down the plane?
Diagram is wrong.

Particle is on the point of moving up the plane, so friction is down the plane.
The end result is still correct, they have just did it the reverse way. It's always best to model the friction as going down the plane though just so you don't make a mistake.
Reply 3
Friction acts in the opposite direction of motion. Just remember that!

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