WAEC - Physics (2018 - No. 28)
A bar AB is balanced horizontally on two knife edges as illustrated as in the diagram above. Determine the weight of the bar.
10.0N
20.0N
40.0N
50.0N
คำอธิบาย
Upward force = downward force = weight of the Bar
20N + 20N = Weight of the BAR
Therefore, the weight of the bar = 40N