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

what are scalar quantities

A

have magnitude ( size) only

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

example of scalar quantities

A

mass, speed, energy, distance, time, tempt

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

what is vector quantities

A

have magnitude and direction

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

exmaples of vector quantities

A

displacement, weight, velocity, force, acceleration, momenutum

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

how to represent vector quantiity by arrow

A
  • length of arrow - magnitude
  • direction of arrow - direcetion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is a force

A

push or pull that acts on an object due to the interaction with another object

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

what are 2 types of forces and meaning

A

contact force = objects are physically touching
non-contact force= objects are physically seperated

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

examples of contact force

A

tension - in a rope of tug of war game, tension on rope pulling the person
friction - force always opposes the motion, areoplane land in sea, frcition act betwen plane and water to cause the plan slow down and stop.
air resistance - force act opposite direction when object move through air - sky diver from air, air particles collide with parachute causing act upwards cos of air reistance force.
-upthrust

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

exmaples of non-contact force

A

-gravitational force - attracts all objects to another object - grav force attract international space station to earth and opposite way
- electrostatic force - force between 2 charged object attract, object opposite charge experience electrostatic force of attraction.
-magnetic force - force experince by certain object in magentic field

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

what is weight and unit

A

the force acting on object due to gravity, newton W

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

what to use for measuring weight

A

newtonmeter

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

what is gravity

A

force of attraction on all objects

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

what is gravitational fiedl strength

A

measure of the force of gravity

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

weight of object is…

A

directly proportional to mass of object

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

what does weight of object depend on

A

the gravitional field strgth at point where object is

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

what is centre of mass

A

weight of object act on single point

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

what is resultant force

A

single force that has same effect as all forces acting together

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

how to calculate resultant forces

A

larger force-smaller

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

convert newton-metres to joule

A

1newton metres=1 joule

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

when is work done on object by force

A

when a force causes object to move through a distance

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

what is elastically deformed

A

object can return orginial shape when force cause it to change shape are removed

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

why do you need to apply more than 1 force

A

the force is unbalance so the object will move than change length/shape

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

elastic materials examples

A

slinky, rubber band and glove, eraser

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

what happens when squeeze force

A

material compresses

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

what is inelastically deformed + why

A

object cant return orginally, because limit of proportionally been exceeded

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

what does limit of proportionally mean

A

point where extension of object is direct proportional to force.

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

what is the moment of force

A

the turning effect of a force

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

examples of turning effect of force

A

see-saw, a crane, hammer use to remove a nail

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

example of turning effect force in rotation

A

spanner use to loosen a nut(screw), the turn effect of force from end of spanner is centre around the pivot(centre of nut)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what is a pivot

A

centre of object

31
Q

how should you calculate the moment

A

distance must be in perpendicular from line of action to pivot (90 degree)

32
Q

exmaple of balance moment of pivot

A

see-saw person both ends, seesaw balance about the pivot in cnetre. each person apply moment due to weight.

33
Q

what is lever

A

rigid bar set on pivot, sued to transfer force to load. force multipers

34
Q

exmaple of lever use

A

hammer use to removve nail, crowbar use to lift a plank of wood

35
Q

what is gear

A

transmit tun effect of force, lots of machine and cars

36
Q

what can lever and gear system do

A

can both be used to transmit the rotatioanl effect of force

37
Q

what is fluid

A

either liquid or gas

38
Q

what happens when particles move around in fluid

A

collide object surface/container

39
Q

what is atmosphere

A

thin layer of air around the earth

40
Q

when does atmospher get dense

A

less dense with increase altiude

41
Q

what is altitude

A

vertical height of object

42
Q

how to create atmospheric pressure

A

air molecules colliding with surface

43
Q

what happens when number of air molecules above a surface

A

decreases as height of surface above ground level increase

44
Q

what is distance

A

how far an object moves

45
Q

what is displacement

A

the measure of distance that object moves in straight line from start point to end, and direction of straight line

46
Q

what does the speed which person can walk, run etc depend on

A

age, fitness, distance travel, terrain

47
Q

speed of
walk, run, cycle, car, train, areoplane, sound air

A

1.5m/s, 3, 6, 13, 50, 250,330

48
Q

what is acceleration

A

of an object tells us the change in its velocity over a given time

49
Q

what does the gradient tells us about acceleration

A

horizontal line - constant
upward slope- accelertaing
downward slope- decelerating

50
Q

what is a velocity

A

speed of an object in directio

51
Q

what is newton 1t law

A

resultant force acting on object is zero then,
object stationary = remain staitionary (not moving over time)
object moving= continue to move at same speed and direction, same velocity

52
Q

in newton1st law, when do velocity change

A

velocity of object only change i resulatn force acting on object

53
Q

exmaple of newton law 1

A

statinoary object(book on table, person standing), no force acts on bceause no resulatnt force. Object 50N left and right, fore is balance means resualtn forceis zero, and velocity same.

54
Q

what is newton 2nd law and sign

A

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

55
Q

what happens to resultant force act on object

A

if greater force = greater acceleration

56
Q

what happens to inversely proportional to mass of object

A

is mass large = accerlation smaller

57
Q

what is newton 3rd law

A

whenever 2object interact, the force they exert on each other are equal and opposite.

58
Q

what is equilibrum
and equilibrum situation

A

condition system of state motion, speed, time change
all force act on object is balanced.

59
Q

example of newton 3rd law

A

book kept on table, man in canoe, paddle push on water same time the water push back on paddle = equal magnitude and oppoisye direcetion

60
Q

what is thinking distance

A

distanc vehicle travels during the driver’s reaction time

61
Q

what is braking distance

A

distance travels under braking force

62
Q

what reaction time

A

time tkaen for driver to spot obstruction and make decison

63
Q

how to calculate stop dist

A

think dist + brake = stop

64
Q

what affects drivers reaction time

A

-tiredness
-drugs alchol
-distraction phone

65
Q

typical value of reaction time

A

0.2-0.9m/s

66
Q

what can affect brake distance of vehicle and why

A

weather conditions - wet/icy road
poor condition of vehicle - worns tyres+brakes
these reduce friction of tyre and road, and increase brake dist

67
Q

the greater the speed of a vehcile…

A

the greater braking force

68
Q

the greater braking force…

A

greater the deceleration of vehicle

69
Q

what can large deceleration lead to

A

brakes overheat and loss of control

70
Q

what is conservation of momentum

A

in closed system, total momentum before an event is equal to the total momentum after the event.

71
Q

when does change in momentum occur

A

when force act on object that is moving/able to move

72
Q

why is rapid changes of momentum danger

A

lead huge forces away

73
Q

how to reduce momentum danger

A

airbag, seatbelt, crashmat, bike helmet - safety device to slow down and reduce force act

Physics Paper 2 (2 decks)

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