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GCSE AQA Physics > P10 - Momentum + Velocity > Flashcards

P10 - Momentum + Velocity Flashcards

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1
Q

resultant force formula

A

mass x acceleration

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2
Q

unit for acceleration

A

m/s^2

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3
Q

Newton’s second law of motion

A

acceleration:
is proportional to resultant force
inversely to mass

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4
Q

Inertia

A

tendency of object to stay at rest or continue in uniform motion

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5
Q

inertial mass

A

measure of difficulty of changing the object’s velocity

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6
Q

inertial mass formula

A

force/acceleration

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7
Q

positive acceleration

A

velocity increases
force is same direction as velocity

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8
Q

negative acceleration

A

velocity decreases
force is in opposite direction

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9
Q

Greater resultant force on object

A

greater object’s acceleration

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10
Q

Greater mass =

A

smaller acceleration

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11
Q

weight

A

force acting on it due to gravity

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12
Q

mass

A

depends on quantity of matter

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13
Q

gravity

A

9.8

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14
Q

weight formula

A

gravity x mass

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15
Q

terminal velocity formula

A

force = weight - frictional force

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16
Q

terminal velocity meaning

A

object reaches a constant velocity when force on it is equal and opposite to its weight

-resultant + acceleration = 0
-weight = frictional force

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17
Q

velocity of object acted on by only gravity

A

10

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18
Q

braking force depends i=on

A

speed of vehicle
-mass

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19
Q

greater speed =

A

greater deceleration

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20
Q

greater mass =

A

greater braking force

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21
Q

stopping distance

A

shortest distance a vehicle can safely stop in

22
Q

thinking distance

A

distance travelled by vehicle in the time it takes driver to react

23
Q

thinking distance formula

A

speed x reaction time

24
Q

braking distance

A

distance travelled by vehicle during time braking force acts in it

25
Q

stopping distance formula

A

thinking + braking distance

26
Q

factors affecting stopping distnace

A

-alcohol/ drugs
-tiredness
-thinking distance
-weather
-worn brakes
-speed

27
Q

acceleration formula

A

a = v^2 - u^2/2s

v = final velocity
u = initial velocity
s = distance

28
Q

braking force formula

A

f = ma

29
Q

momentum unit

A

kg m/s

30
Q

momentum formula

A

mass x velocity

31
Q

momentum vector or scalar

A

vector
size and direction

32
Q

conservation of momentum

A

total before = total after an event in a closed system
-no resultant force acts on it

33
Q

momentum of object A =

A
  • momentum of obejct B
34
Q

momentum of A + momentum of B =

A

0

35
Q

longer impact time =

A

more impact force is reduced

36
Q

force, mass, velocity, time formula

A

f = m x v /t

37
Q

when vehicles collide, force of impact depends on

A

mass
velocity
length of impact time

38
Q

when 2 vehicles collide

A

they exert equal and opposite forces on each other
-total momentum is unchanged

39
Q

impact force formula

A

change of momentum /impact time

40
Q

shorter impact time =

A

greater force

41
Q

cycle helmet + cushioned ground safety

A

reduces impact
-increases impact time

42
Q

seat belts + air bags safety

A

spread force across chest
-increase impact time

43
Q

crumple zones safety

A

give way in impact
increase impact time

44
Q

elastic

A

can bend back to shape
when forces deforming it are removed

45
Q

extension

A

increase of length from original

46
Q

extension of strip formula

A

length at stage - original length of spring

47
Q

Hooke’s Law

A

-extension is directly proportional to force
-as long as limit of proportionality isn’t exceeded

48
Q

limit of proportionality

A

cannot bend back into shape

49
Q

Hooke’s law formula

A

f = ke

50
Q

stiffer the spring =

A

greater the spring constant

51
Q

beyond the limit of proportionality = which type of relationship

A

non-linear

GCSE AQA Physics (37 decks)

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