Question

State the principle of moments as applied to a lever:

• A. Load $\times$ Load Arm = Effort $\times$ Effort Arm
• B. Load $\times$ Effort Arm = Effort $\times$ Load Arm
• C. Load = Effort
• D. Load Arm = Effort Arm

Answer 1

The correct option is A Load $\times$ Load Arm = Effort $\times$ Effort Arm

According to the principle of moments when an object is in equilibrium the sum of the anticlockwise moments about a turning point must be equal to the sum of the clockwise moments.
i.e Load $\times$ Load Arm $=$ Effort $\times$ Effort Arm