Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

physics paper 2 > forces > Flashcards

forces Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

scalar quantities

A

has only a magnitude

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

vector quantities

A

has a magnitude and direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

velocity quantity

A

vector (shows direction + speed)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what are arrows used for?

A

used to show vector quantities

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

arrow length and arrow point =

A

magnitude and direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

forces are … quantities

A

vector quantities

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

force=

A

occurs when 2 or more objects interact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

contact force

A

usually touching

people

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

non contact force

A

not touching

gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

contact force examples:

A
  • friction
  • air resistance
  • tension
  • normal contact
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

non-contact force examples:

A
  • gravitational force
  • electrostatic force
  • magnetic force
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

mass is related

A

to the amount of matter it contains and is constant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

weight

A

force acting on an object due to gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

WEIGHT=

A

MASS x GRAVITATIONAL FIELD STRENGTH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

resultant forces-

A

when more than 1 force acts on an object

seen as a single force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

vector diagrams are used

A

to show the overall effect when more than one force adds on an object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

in vector diagrams:

A

forces are added together to find a single resultant force

magnitude and direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

scale vector diagrams

A

also used when force is acting in a diagonal direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

when a force causes an object to move…

A

work is done on the object

- because it requires energy to move the object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

WORK DONE=

A

FORCE x DISTANCE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

displacement =

A

movement of the object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

to change shape of an object…

A

more than 1 force has to be applied

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

elastically formed=

A

if the object returns to its original shape after forces removed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

inelastically formed=

A

if object does not return to its original shape after forces removed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

the extension of an object =

A

directly proportional to the applied force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

once limit of proportionality has been exceeded:

A
  • doubling force will no longer exactly double the extension
  • relationship becomes non- linear
  • force extension graph will stop becoming a straight line
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

FORCE=

A

SPRING CONSTANT x EXTENSION

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

distance=scalar quantity:

A
  • how far an object moves

- does not take into account the direction an object is travelling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

displacement=vector quantity:

A
  • has a high magnitude, describes how far the object has travelled from the origin
  • has a direction, of the straight line
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

speed

A
  • a measure of how fast an object is travelling

scalar quantity

31
Q

SPEED=

A

DISTANCE
—————
TIME

32
Q

velocity

A

speed of something in a given direction

vector quantity

33
Q

object travelling in straight line=

A
  • constant speed

- constant velocity

34
Q

object not travelling in a straight line=

A
  • constant speed

- change of velocity

35
Q

object moving in a circle=

A
  • constantly changing velocity

- accelerating whilst travelling at constant speed

36
Q

newton’s first law=

A

an object will stay in the same state of motion unless acted on by an external force

37
Q

when resultant force is 0

stationary

A

it remains stationary

38
Q

when resultant force is 0

moving

A

it continues to move at the same speed and direction

39
Q

INERTIA =

A

tendency for objects to continue in the same state

40
Q

velocity (speed or direction) will only change

A

if there is a resultant force on it

41
Q

distance time graphs

A
  • used to represent the motion of an object travelling in a straight line
42
Q

the speed of an object on the time graph

A

is found from the gradient of the line

43
Q

acceleration

A

is the measure of how quickly it speeds up, slows down or changes direction

44
Q

ACCELERATION=

A

CHANGE IN VELOCITY
———————————
TIME TAKEN

45
Q

when slows down:

A

negative acceleration

46
Q

velocity time graphs, gradient=

A

can be used to find the acceleration of an object

47
Q

velocity time graph

total distance travelled =

A

area under graph

48
Q

newton’s second law:

A

the acceleration of an object is proportional to the resultant force acting on the object and inversely proportional to the mass of the object

49
Q

newton’s second law

if the resultant force is doubled…

A

acceleration will double

50
Q

if the mass has doubled…

A

acceleration will be halved

51
Q

FORCE=

A

MASS x ACCELERATION

52
Q

inertial mass=

A

given by ratio of force over acceleration

53
Q

the larger mass..

A

the bigger force needed to change the velocity

54
Q

terminal velocity:

A

highest possible velocity when object falls through fluid

55
Q

when an object falls through a fluid:

A

-object accelerates
-as it speeds up: resistive force increases
-resultant force reaches 0 when the resistive forces balance the force of gravity
-object will fall at streaky speed
(terminal velocity)

56
Q

newtons third law

A

for every action there is an equal and opposite reaction

57
Q

for every action there is an equal opposite reaction means

A

that whenever one object exerts a force on another, the other object exerts a force back

58
Q

momentum or a moving object…

A

depends on it’s mass + velocity

59
Q

the greater momentum of an object…

A

the greater the force needed to stop the object

60
Q

at the same speed, the larger mass…

A

will have more momentum than a smaller mass

61
Q

with the same mass, a faster object…

A

will have more momentum than a slower object

62
Q

MOMENTUM =

A

MASS x VELOCITY

63
Q

in a closed system

momentum

A

the total momentum before an event = total momentum after

64
Q

conservation of momentum

A

referred to during collisions

rockets + projectiles

65
Q

stopping distance depends on…

A
  • the thinking distance
    (reaction time)
  • the breaking distance
    (breaking force)
66
Q

breaking force:

A
  • the great the speed of the vehicle, the longer the stopping distance
67
Q

reaction time:

A

how quickly a person responds to a stimulus

68
Q

reaction time can be affected by:

A

tiredness
drugs
alcohol
distractions (phone)

69
Q

the increase reaction time =

A

increase stopping distance

70
Q

how to measure reaction time:

A

ruler drop test

71
Q

factors affecting breaking distance

A
  • conditions of the road
  • vehicle
  • weather
72
Q

greater the breaking force=

A

greater deceleration of the vehicle

73
Q

to find the size of breaking force=

A

the equation for work done is used

74
Q

WORK DONE=

A

FORCE x DISTANCE

physics paper 2 (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions