Question

Two forces F1 and F2 are applied to a plank that supports a body of mass m, as shown in the figure. The distances between these forces and the body of mass m are L1 and L2, respectively.

A. The values of F1 and F2 in static equilibrium depend on the choice of the axis of rotation.
B. In static equilibrium F1 = F2 for any values of L1 and L2.
C. The value of the sum (F1+ F2) that corresponds to static equilibrium is indepdendent of L1 and L2.
D. In static equilibrium, if L1 > L2, then F1 > F2.

Answer 1

The correct answer is - option C.

Step-by-step explanation:

Given:

Two forces on a plank = F1 and F2

mass of plank = m

The distances between these forces and the body of mass m = L1 and L2

we know that,

mg = F1 +F2 ( independent of L1 and L2)

so almost any point the value of the sum that corresponds to static equilibrium is independent of L1 and L2.

Thus, the correct answer is - option C.