Question

Question #caac8

Answer 1

`A=200` N, `B=800` N

Explanation:

Let `F_a` and `F_b` (N) the reaction force at A and B, respectively.

The first equation is the equilibrium of force:
`F_a+F_b=1000`　・・[1]

The second equation is the equilibrium of momentum at the fulcrum. In the figure below, `W_1*a=W_2*b` must be satisfied.

For this question, the equation is
`4.0F_a=1.0F_b` ・・[2]

Solving [1] and [2] gives us the answer `F_a=200` and `F_b=800` N.