turning effect of forces

Question 1

What is the turning effect of a force (aka a moment)?

Answer 1

product of the force and the perpendicular distance of the pivot from the line of action of the force

Question 2

What is the principle of moments?

Answer 2

When an object is in equilibrium, the sum of clockwise moments about a pivot is equal to the sum of anticlockwise moments about the same pivot.

Question 3

What is the center of gravity of an object?

Answer 3

CG of an object is the point through which its whole weight appears to act for any orientation of the object.

Question 4

What is stability?

Answer 4

Stability is a measure of a body’s ability to maintain its original position.

Question 5

For something that is stable, the ____ __ ____ of its weight must lie within the base area

Answer 5

For something that is stable, the line of action of its weight must lie within the base area

Question 6

State what happens during stable equilibrium, unstable equilibrium, and neutral equilibrium.

Answer 6

Stable equilibrium: obj returns to its original position after being displaced slightly
Unstable equilibrium: obj continues to move away from its original position
Neutral equilibrium: obj remains where it is displaced