Question

rolling motion:

Answer 1

i know that F3 moves it to the left and F1 moves it to the right. but why does F2 move the object to the right. its torque about the momentary pivot looks like its clockwise to me?!

Answer 2

Hint: Break F2 into components

Answer 3

i did and i drew a line to check the direction of the torque

Answer 4

So, F2 has a component in the same direction as F1....agreed?

Answer 5

agreed

Answer 6

so if f1 moves it to the right why wouldn't f2? The key again is in a FBD.

Answer 7

does the vertical component override horizontal component and cancel the torques altogether

Answer 8

?

Answer 9

can you also check the moment of inertia question on the other physics group?

Answer 10

no, the vertical component would tend to want to lift the object up reducing the magnitude of the normal force. The horizontal component would pull it to the right.
Both components would create counterclockwise rotation

Answer 11

Send me a link to the other problem

Answer 12

http://openstudy.com/updates/54713136e4b060295e922e31

Answer 13

Just looked at it, can you send me a photo of the problem?

Answer 14

the vertical component would be similar to F3, right? so, the horizontal component would rotate it clockwise and the vertical component rotates it anti clockwise, right?

Answer 15

If you're saying that the object would move to the right as well as rotate counterclockwise, then that wouldn't be right because then, the object will not 'roll without sliding'

Answer 16

is there friction in this problem?

Answer 17

yes

Answer 18

So here is the first case....easy to see it rolls to the left.
I want you to draw the FBD for cases 2 and 3...and don't forget to include friction.