Question #caac8

1 Answer
yumean1119
Dec 25, 2017

#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.
https://ameblo.jp/yoruno-mimizuku/entry-11674919485.html

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.

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