4: Forces (INCOMPLETE)

Question 1

Hooke’s Law

Answer 1

Hooke’s law states that the force is directly proportional to the extension in a material if it’s limit of proportionality is not exceeded.

Question 2

Centre of gravity

Answer 2

Centre of gravity is the point at which the whole weight of a body may be thought to act.

Question 3

Moment

Answer 3

Moment is the turning effect of a force. The moment of a force is equal to the product of the force and the perpendicular distance of the line of action of the force from the pivot.

Question 4

Torque

Answer 4

The magnitude of the torque of a couple is defined as the product of one of the forced and the perpendicular distance between the lines of action of the forces.

Question 5

Principle of Moments

Answer 5

The Principle of Moments states that if a body is in equilibrium, the sum of all the clockwise moments about any axis must equal to sum of all the anticlockwise moments about the same point.

Question 6

Archimedes’ Principle

Answer 6

Archimedes’ Principle states that when a body is totally or partially immersed in q fluid, it experiences an upward force (upthrust) equal to the weight of fluid displaced.

Question 7

Principle of Flotation

Answer 7

The Principle of Flotation states that for an object floating in equilibrium, the upthrust is equal to the weight of the object.