Forces definitions Flashcards

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1
Q

Hooke’s law

A

The extension of a body is proportional to the applied load if the limit of proportionality is not exceeded

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2
Q

Density

A

Mass per unit volume

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3
Q

Pressure

A

Force per unit area

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4
Q

Upthrust

A

Vertical upward force exerted on a body by a fluid when it is fully or partially submerged in the fluid due to the difference in fluid pressure

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5
Q

Archimedes Principle

A

Upthrust on a body in a fluid is equal to the weight of the fluid displaced by the body

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6
Q

Principle of floatation

A

For an object floating in equilibrium, the upthrust is equal in magnitude and opposite in direction to the weight of the object

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7
Q

Moment of a force about an axis

A

The moment of a force about an axis is defined as the product of the force and the perpendicular distance of the line of action of the force from the axis

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8
Q

Couple

A

A pair of equal and opposite forces whose lines of actions do not coincide

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9
Q

Torque of a couple

A

The product of the magnitude of one of the forces and the perpendicular distance between the forces

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10
Q

Centre of gravity

A

The point at which its whole weight appears to act

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11
Q

Static equilibrium

A

Translation eq: The total resultant forces acting on the object must be zero;

Rotational eq / Principle of moments: For a body in rotational equilibrium, the sum of all the clockwise moments about any axis must be equal to the sum of all the anticlockwise moments about the same axis

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