Forces Flashcards

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1
Q

Field of force

A

a region of space where a particle experiences a force

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2
Q

Translational equilibrium

A

A body is in translational equilibrium when there is no resultant force

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3
Q

Hooke’s Law

A

the change in length of a material is directly proportional to the force applied on it, provided that the limit of proportionality is not exceeded
F=kx

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4
Q

Pressure

A

The force per unit area
p=F/A

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5
Q

Rotational equilibrium

A

A body is in rotational equilibrium when there is no resultant torque about any point

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6
Q

Principle of moments

A

For a body in rotational equilibrium, sum of clockwise moments about any point is equal to sum of anti-clockwise moment about the same point

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7
Q

Moment of a force about a point

A

Product of the force and the perpendicular distance of the force to the pivot
M=Fd

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8
Q

Torque of a couple

A

product of one of the forces and the perpendicular distance between the forces
torque=Fxd(perpendicular)

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9
Q

centre of gravity

A

the point from where all the weight of a body seems to act

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10
Q

viscous force

A

magnitude of viscous force on a body increases with the relative speed of the body with respect to the fluid

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11
Q

equilibrium

A

there is no resultant force and there is no resultant torque about any point on it

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12
Q

upthrust

A

the upward force exerted by a fluid on an object submerged fully or partially in the fluid due to the difference in pressure exerted by the fluid on the upper and lower surfaces of the object.
it acts through the centre of mass of the displaced fluid and is equal in magnitude and opposite in direction to the weight of fluid displaced by the body

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