A block is on a ramp. What is happening to the block for each of the following situations?:
1. fk(down the ramp)
2. fs(up the ramp) < w,x(down)
3. Tension(up) > fk(down) + w,x(down)
4. fk(up) < w,x(down)..FBD also looks like fk(up) magnitude is equal to fs(up) from 2.
A) a block is sliding down a ramp at increasing speed.
B) a block is being dragged up a ramp.
C) a block is sliding down a ramp at decreasing speed.
D) a block is sliding up a ramp.
E) a block is stationary on a ramp.
F) a block is momentarily at rest; it is changing directions-after sliding up a ramp, it is about to slide back down.
Newton's second: Fnet=ma
The Attempt at a Solution
This is what i think. Please correct me if I'm wrong at any point. Thanks.
1.A - because both weight and friction pulls it down
2.E - because fs is acting.
3.B - Since tension is greater than the sum of fk and weight that is pulling it down. But
what is the difference between sliding up and being dragged up? Since tension is
making it go up, should it be dragged up?
4.F - momentarily at rest because magnitude of fk is equal to fs from 2. But changes to
downwards because given that fk and not fs is applied.