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Physics > P10 Forces and Motion > Flashcards

P10 Forces and Motion Flashcards

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1
Q

what is the equation for acceleration

A

a = Force / mass

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2
Q

what is newtons 2nd law

A

If a resultant force is applied to an object it will accelerate

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3
Q

define inertia

A

resistance in change of motion

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4
Q

define inertial mass

A

a measure of how difficult it is to change the velocity of an object

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5
Q

what is Newton’s 1st law

A

Objects remain at rest or in uniform motion unless an external force acts

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6
Q

what is Newton’s third law

A

Every object has an equal and opposite force

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7
Q

how do you calculate the weight of an object knowing their mass

A

weight = mas x gravitational field strength

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8
Q

what is the gravitational field strength on earth

A

9.8

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9
Q

what is a moment

A

the turning force of an object

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10
Q

how do you calculate the moment of an object

A

moment = force x distance

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11
Q

what do levers do

A

make it easier for us to do work

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12
Q

what do gears do

A

transmit rotational effects

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13
Q

how do gears work

A

different sized gears are used to change the moment of forces

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14
Q

what do objects in fluids eperience

A

upthrust
weight = upthrust

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15
Q

what does the stopping distance equal

A

stopping distance = thinking distance + braking distance

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16
Q

what is the thinking distance

A

how far a object travels during the drivers reaction time

17
Q

what is the braking distance

A

the distance taken to stop under the breaking force

18
Q

what affects the thinking distance

A
  • speed = faster = further before reaction
  • reaction time = longer = longer before break applied
19
Q

what factors affect the braking distance

A
  • speed = longer to stop
  • weather/surface = friction
  • tyre condition
  • brake quality = worn/faulty
20
Q

what is the braking distance for a car at 30mph

A

14m

21
Q

what is the braking distance for a car at 60mph

A

55m

22
Q

what is the braking distance for a car at 70mph

A

70m

23
Q

how do you calculate the momentum of an object

A

p = mass x velocity

24
Q

what is the conservation of momentum

A

the total momentum before an event = the total momentum after an event

25
Q

how do you calculate change in momentum

A

mass x ((origanl - current) / time)

26
Q

what is the difference between a vector and scalar quantity

A

vector involves magnitude and direction, scalar is just magnitude

27
Q

what are the units used for a moment

A

Nm

28
Q

what is the resultant force

A

the overall force acting on an object when multiple forces are acting on it

29
Q

how do we represent force

A

in a scale diagram

30
Q

what is the resolving force

A

finding the horizontal and verticle components of a single force

31
Q

what is hookes law

A

the extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded

32
Q

what is the equation for hookes law

A

force = spring contasnt x extension

33
Q

define elastic deformation

A

when the forces are removed the object returns to its original length

34
Q

if an object is balanced describe the clockwise and anitclockwise froces

A

they must be equal

35
Q

what is the equation for pressure

A

p = force / area

36
Q

what is terminal velocity and when does it occur

A

the maximum velocity an object can fall at, this happened when forces are balanced

37
Q

Define centre of mass

A

The centre of mass is the point at which the object will balance

38
Q

what is the limit of proportionality

A

the point beyond which Hooke’s law is no longer true when stretching a material. It is the point where the object no longer deforms elastically and starts to deform inelastically

39
Q

what is the typical reaction time for a human

A

0.2 - 0.9 seconds

Physics (12 decks)

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