Posted by Phil on Saturday, January 9, 2010 at 8:27pm.
Well, downward forces are W, and upward forces are his Pull, and tension.
So his pull + Tension=W on the tire side.
On the other side, tension=Pulling force
do the math.
Ok, I think I got it. Are these free body diagrams correct? (ignore the dots)
.T.....(This tension is down)
T.F....(This tension is up)
2F=W so F=(1/2)W
Now I'm confused. Why does changing the direction of a force double it? I'm also confused about whether the tension is a reaction to the weight of the tire and the boy or the force that the boy pulls down on the rope with. Also if the force in the free body diagram of the system were another person pulling the tire and the boy up, why would the force not be half the weight in that case?
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