- #1
Joules6626
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Homework Statement
Hi, I'm having a problem with a mechanics question. I'm not really sure where to begin solving the problem. It reads:
A lawn roller is 20 inches in diameter and weighs 100 pounds. What horizontal force is needed to pull it over a brick 2 inches high?
What is the force of the brick on the roller and what direction is it in?
Any help would be so greatfully appreciated. Thanks in advance.
Homework Equations
L = r x p
torque = F x r
d:/dt = torque
Moment of inertia = 1/2MR^2
The Attempt at a Solution
I tried finding the angular momentum about the corner of the brick where the roller first touches it. This would make my R equal to the radius of the roller. But when I find the L when the roller is on the brick, it ends up being the same which can't be true since there is an outside force working on it.