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Physics > Mechanics > Flashcards

Mechanics Flashcards

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1
Q

What is meant by the moment of a force?

A

The turning effect

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2
Q

What is given by the area beneath a force-extension graph for a spring?

A

The energy stored in the spring

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3
Q

What are the 2 conditions for an object to be in equilibrium?

A

Resultant force is 0
Sum of clockwise moments = sum of anticlockwise moments

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4
Q

What is meant by a perfectly elastic collision?

A

A collision where there is no loss of kinetic energy

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5
Q

Units of tensile stress

A

pascals / Nm^-2

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6
Q

What is given by the gradient of a force-extension graph for a spring?

A

The spring constant

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7
Q

Define power

A

The rate of energy transfer or rate of work done

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8
Q

What is conserved in an inelastic collision?

A

Momentum and total energy

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9
Q

What is the area beneath a force distance graph?

A

The energy transferred to the object

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10
Q

What is given by the area within a loading and unloading curve on a force-extension graph?

A

The energy stored in the material when the force is removed

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11
Q

What is meant by the terminal speed of an object?

A

The maximum speed of an object when moving through a medium

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12
Q

What is the rule for adding springs in series?

A

1/Kt=1/K1+1/K2…….

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13
Q

What are the conditions for terminal speed?

A

Drag=weight

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14
Q

How do you determine velocity from displacement- time graph?

A

Gradient

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15
Q

Describe the stress strain graph for a brittle material

A

A breaking point that is at or immediately after the limit of proportionality

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16
Q

Define impulse

A

The change in momentum ( not rate)

17
Q

Under what condition will the object topple?

A

When the line of action of the objects weight moves past the pivot point

18
Q

Define plastic deformation

A

Some energy is not recovered and therefore the object does not return to original length when force is removed

19
Q

Define an inelastic collision

A

A collision where there is a loss of kinetic energy

20
Q

What is meant by elastic deformation?

A

When all the energy is recovered and object returns to original shape when the force is removed

21
Q

Describe stress strain graph for a ductile material

A

Large curved section after the initial linear section

22
Q

What is the area underneath a force time graph?

A

The impulse

23
Q

What methods can be used to measure acceleration due to gravity?

A

Electromagnet and trapdoor
Light gates and data logger
Burst photography

24
Q

What are the units of momentum?

A

Kgms^-1

25
Q

Define centre of mass in terms of turning effects

A

The point where is has no turning force

26
Q

What is a couple?

A

A pair of equal and opposite forces acting on object along different parallel lines

27
Q

Describe force extension graph for polythene

A

Curve then straight down

Physics (7 decks)

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