Topic 3 ( MOMENT OF A FORCE AND COUPLE )

Question 1

describes its rotational effect about a point or axis. It is a critical concept in mechanics, widely used to analyze and design structures and mechanical systems.

Answer 1

moment of a force

Question 2

he product of a force and the perpendicular distance (moment arm) from the force’s line of action to the point of rotation.

Answer 2

moment of a force

Question 3

Definition: The total moment about a point equals the sum of the moments of the individual force components.
Significance: Simplifies the calculation of moments in complex force systems.

Answer 3

Principle of Moments (Varignon’s Theorem)

Question 4

Definition: A pair of equal and opposite forces separated by a distance, creating a pure rotational effect with no net translational force.

Answer 4

Couple

Question 5

reveal how forces cause objects to rotate, which is crucial for ensuring stability in structures and mechanisms.

Answer 5

Moments

Question 6

By breaking forces into components, complex systems become easier to analyze, saving time in engineering calculations

Answer 6

Varignon’s Theorem

Question 7

produce rotation without translation, making them essential in designing gears, levers, and other mechanical systems.

Answer 7

Couples