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Physics > Statics > Flashcards

Statics Flashcards

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1
Q

What is the formula for weight?

A

Mass x gravity

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2
Q

What is the formula for force?

A

Mass x acceleration

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3
Q

What are concurrent forces?

A

All forces act on a single point.

Non-concurrent- do not act on a single point

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4
Q

What are non-concurrent coplanar?

A

Force act in different lines but only on one plane.

Two dimensions only.

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5
Q

What can a vector represent?

A

Anything that has magnitude (size) and direction.

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6
Q

What is scalar?

A

If a quantity has magnitude (size) but no direction.

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7
Q

What is the equation for moment?

A

Force x distance

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8
Q

What is a static equilibrium?

A

Any mass that has no resulting force or moment acting on it. (but all forces must be concurrent)

(D’Alamberts principle)- moments are equal either side

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9
Q

What is the formula for distance of centre of gravity from datum point?

A

Total moment / total weight

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10
Q

What is hookes law?

A

When an elastic object is stretched and the extension is directly proportional to the amount of force applied.

F = k x e

Force = spring constant x extension

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11
Q

What are direct forces?

A

Tensile and compressive forces

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12
Q

What is the formula for stress?

A

Stress = force/area

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13
Q

What is the fundamental unit of stress?

A

Pascals (N/m2)

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14
Q

What is ultimate tensile stress?

A

When a material is stretched until it breaks.

Ultimate tensile stress = maximum force applied / original area

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15
Q

What is the formula for strain?

A

Strain = deformation / length

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16
Q

What is the safety factor?

A

Ultimate tensile stress / max allowed

17
Q

What is ultimate tensile stress?

A

When a material is stretched until it breaks.

Ultimate tensile stress = maximum force applied / original area

18
Q

What is the formula for strain?

A

Strain = deformation / length

19
Q

What is the safety factor?

A

Ultimate tensile stress / max allowed

20
Q

What is stiffness?

A

The ability to resist deformation due to an applied force.

Stiffness = force applied / deformation

21
Q

What is the formula for shear stress?

A

Force / area

22
Q

What is deformation?

A

When a load is applied to a material and it changes shape.

23
Q

What is elastic deformation?

A

Shape which deforms but returns to its original shape.

Permanently deforms is called plastic deformation.

24
Q

What happens to volume when a gas changes to a liquid?

A

Very large reduction in volume.

25
Q

What happens to volume when a liquid changes to a solid?

A

Relatively small decrease or increase in volume.

26
Q

What is the formula for density?

A

Density = mass / volume

27
Q

What is the formula for pressure?

A

Pressure = force / area

28
Q

What happens to the pressure exerted by a fluid?

A

Will always act at right angles to any surface in contact with the fluid.

29
Q

What happens to pressure of a fluid with depth?

A

Pressure increases with depth.

30
Q

What is absolute pressure?

A

Ambient pressure added to the gauge pressure.

31
Q

What is the formula for pressure in liquids?

A

Pressure in liquids = density x height x gravitational acceleration

32
Q

What is the rule form fluid transmission (putting pressure into a container of liquid)?

A

Pressure at every point is increased by the same amount.

33
Q

What is the formula for load?

A

Load = pressure x area

34
Q

What is Archimedes principle?

A

A body in fluid experiences an upthrust equal to the weight of fluid it displaces.

35
Q

What is the formula for relative density for bodies in water?

A

Relative density = weight of solid / upthrust

36
Q

What does a hydrometer measure?

A

Relative density.

37
Q

What does a piezometer measure?

A

Pressure of liquids in pipes.

Physics (6 decks)

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