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Super Quick M1 Moments Question

Can someone just explain to me the idea behind this (I just really want to understand the concepts properly):





I already understand that in a uniform rod, the weight of the plank acts in the middle.
Original post by creativebuzz
Can someone just explain to me the idea behind this (I just really want to understand the concepts properly):





I already understand that in a uniform rod, the weight of the plank acts in the middle.


I think that's it.

A uniform rod means the mass is evenly distributed and the weight acts at the mid-point.
Original post by rayquaza17
I think that's it.

A uniform rod means the mass is evenly distributed and the weight acts at the mid-point.


So is the weight equal to the reaction at C?
Original post by creativebuzz
So is the weight equal to the reaction at C?


If by weight you mean the weight of the rod and Jill and David, then yes. This is since the seesaw isn't moving (the forces are balanced), the up forces and the downforces are equal thus reaction is the sum of all of the weights.

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