Brainscape's Knowledge GenomeTM

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


See full index

edexcel igcse physics > EX unit one: forces and motion > Flashcards

EX unit one: forces and motion Flashcards

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

distance travelled =

A

speed x time

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

unit of speed

A

metres/second or kilometres/hour

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

on a distance time graph what does the gradient or slope give?

A

the speed

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

on a distance time graph what does a horizontal line mean?

A

the object is stationary

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

acceleration =

A

change in velocity / time taken

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

what is the symbol for acceleration

A

a

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

what is the symbol for time

A

t

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

what is the symbol for velocity or speed

A

v

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

what is the symbol for distance

A

x or s

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

in a velocity time graph, what does the gradient or slope give?

A

acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

in a velocity time graph, what does the straight line mean?

A

constant acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

in a velocity time graph, what does the area under the graph show?

A

distance

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

final velocity squared =

A

initial velocity squared x 2 x acceleration x distance moved

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

what is the symbol for final velocity

A

v

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

what is the symbol for initial velocity

A

u

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

what are forces

A

pushes or pulls that one body exerts on another

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

normal reaction

A

the special name for the contact force that acts on an object pressing down on another object.

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

tension

A

in strings, cables, ropes etc. things that are being stretched.

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

friction

A

the force that opposes motion, either when you try to make something move or whilst it is moving

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

air resistance

A

friction between an object and the air (or gas) that its moving through

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

viscous drag

A

similar to air resistance, but occurs when an object is moving through a liquid.

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

upthrust

A

the upward force that liquids and gases exert on objects.

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

weight

A

the force that acts on a body because of gravity

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

magnetic

A

forces that magnets exert on other magnets or things made of iron

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

electrostatic

A

the force between electrically charged objects

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

unit of force

A

newtons (N)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

are forces vector or scalar

A

vector

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

unbalanced forces acting on an object will cause…

A

a change in that object

e.g. accelerate, decelerate, change direction or change shape

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

how do you work out resultant force

A

subtract the forces acting on the object, and write the answer before the direction

30
Q

hooke’s law

A

the extension of a spring is directly proportional to the force pulling it.

31
Q

glass does not stretch but breaks. this means it is…

A

brittle

32
Q

plasticine does stretch but does not return to its original shape. this means it is…

A

plastic

33
Q

steel does stretch and does return to its original shape. this means it is…

A

elastic

34
Q

what is the elastic limit

A

the point where the spring is overstretched and it will not return to its original length when the force is removed.

35
Q

do rubber bands obey hookes law?

A

no, if you continue to stretch it the band will break.

36
Q

force =

A

mass x acceleration

37
Q

what does newton’s second law show?

A

the acceleration of an object is proportional to the force acting on it

38
Q

to decrease the time and distance it takes for a car to stop by breaking, what must you increase

A

the friction force between the tyres and road surface (as shown through a = f / m , and how you cannot change the mass)

39
Q

thinking distance

A

the distance you travel before you start to apply the brakes, which in turn, depends on your reaction time.

40
Q

braking distance

A

the distance you travel while the car is decelerating to rest.

41
Q

give thinking distance factors

A

alcohol and drugs, tiredness, visibility, distractions

42
Q

give braking distance factors

A

worn tyres and brakes, icy and wet roads, speed

43
Q

what is the approximate value for the gravitational field strength on earth

A

10 m/s squared

44
Q

weight =

A

mass x gravitational field strength

45
Q

what is the symbol for weight

A

W

46
Q

what is the symbol for mass

A

m

47
Q

what is the symbol for gravitational field strength

A

g

48
Q

explain terminal velocity

A

when the size of the drag force caused by air resistance increases with speed - at some speed the size of the drag foce will be enough to balance the weight of the object. so the overall resuktant force on the object will be zero and it will no longer accelerates having reached its terminal/maximum velocity.

49
Q

is acceleration a vector or scalar quantity

A

vector

50
Q

are accelerating objects changing their velocity or their speed

A

they must be changing both

51
Q

momentum

A

a measure of how easily an object can be brought to rest

52
Q

is momentum a vector or scalar quantity

A

vector

53
Q

what is momentum measured in

A

kilogram metres per second

kg m/s

54
Q

what is mass measured in

A

g or kg

55
Q

what is an elastic collision

A

one where no energy is lost

56
Q

conservation of momentum is

A

the momentum of bodies colliding is always conserved.

57
Q

total momentum of the two bodies before collision =

A

total momentum of the two bodies after collision

58
Q

if one object is moving north and the other is moving south, what must you remember?

A

that the sign of one must be negative. it is up to you to choose whether to make north or south positive but you must stick to it.

59
Q

force =

A

change in momentum / time taken

60
Q

change in momentum is

A

final momentum - initial momentum

61
Q

what is the symbol for momentum

A

p

62
Q

what is the symbol for force

A

F

63
Q

what are crumple zones

A

cars are designed with crumple zones to increase deceleration times, decrease forces and reduce injuries

64
Q

what is newtons third law

A

for every action there is an equal and opposite reaction.

65
Q

key features of every action-reaction pair of forces (involving newtons third law)

A

they are equal in size, opposite in direction, of the same type, and act on different objects

66
Q

moment =

A

force x perpendicular distance from pivot

67
Q

what is the moment of a force

A

it’s ‘turning effect’. levers are used to increase the turning effect of a force by increasing the distance between the force applied and the point around which the object will turn.

68
Q

sum of clockwise moments =

A

sum of anticlockwise moments

69
Q

if a beam is stationary, two conditions must be fulfilled:

A

the sum of the upward forces acting on the beam is equal to the sum of the downward acting forces.
the sum of clockwise moments acting on the beam about any point is equal to the sum of anticlockwise moments acting on the beam.

70
Q

what is the centre of gravity

A

the whole weight of an object acts through one point of the object called its centre of gravity.

edexcel igcse physics (13 decks)

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