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Forces > Forces > Flashcards

Forces Flashcards

1
Q

Distance

A

The length of a path between two points

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2
Q

Meter

A

A lenght of measure, used to describe how fast something or someone is going

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3
Q

Centimetre

A

A lenght of measure, used to describe how fast something or someone is going(smaller than meters)

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4
Q

Kilometers

A

A lenght in measure and its to describe how fast something is going in a distance

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5
Q

Time

A

Seconds,minutes,hours

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6
Q

Seconds

A

Measurement in time

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7
Q

Minutes

A

Measurement in time

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8
Q

Hours

A

Measurement in time

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9
Q

Speed

A

Measurement of how fast someone or something is going

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10
Q

M/s, cm/s, km/hr

A

Measurement of time for how fast something is going. It is also the answer to how far and how long it to something or someone.

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11
Q

Displacement

A

Distance and direction of an object’s change in position from the starting point.

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12
Q

Distance vs. time graph

A

Shows the distance an object travels in a certain amount of time.

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13
Q

Slope

A

The steepness of a line on a graph

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14
Q

Average

A

The average of a value

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15
Q

Independent variable

A

The experimental factor that is manipulated; the variable whose effect is being studied

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16
Q

Dependent variable

A

The outcome factor; the variable that may change in response to manipulations of the independent variable.

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17
Q

Constant variable

A

The variable that doesn’t change

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18
Q

Acceleration

A

The rate at which velocity changes

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19
Q

average speed

A

total distance divided by total of time

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20
Q

average speed equation

A

distance/time=speed

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21
Q

instantaneous speed

A

the speed of an object at one instant time

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22
Q

caption

A

a few descriptive words providing readers with information regarding a figure, table, or equation.

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23
Q

scatter plot

A

a graph with point plotted to show a possible relationship between two sets of data

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24
Q

trend-line

A

growth path the economy would follow if it were not interrupted by alternating periods of recession and recovery

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25
Q

constant speed

A

speed that does not change

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26
Q

changing speed

A

when the objects speed changes per unit of time

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27
Q

example of distance units

A

cm,meters,km

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28
Q

example of time units

A

second, minutes, hours

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29
Q

example of speed units

A

M/s, cm/s and km/h

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30
Q

example of a constant speed

A

-A person walking at the same speed
-a horse walking at the same speed,
-a car driving exactly the speed limit.

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31
Q

example of a zero slope

A

no movement

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32
Q

example of acceleration

A

a boulder rolling down a hill faster

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33
Q

example of deceleration

A

a car approaching a red light

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34
Q

in a distance time graph the x axis should be

A

time

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35
Q

in a distance time graph the y axis should be

A

distance

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36
Q

Why do we find the average speed instead of a instantaneous speed

A

It is nearly impossible to find the instantaneous speed because speed is always changing in nano seconds, which is a pain to figure out

37
Q

What logic do you use when you are looking at a graph that has two constant speeds and the question is asking you what speed is going faster?

A

You look for the speed that’s slope is steeper

38
Q

If a curved line on a graph is facing up what direction is the speed going?

A

its going up

39
Q

If a curved line on a graph is facing up then curving and pointing down, what direction is the speed going

A

it is acceleration and the decreasing slowly

40
Q

in order for scientist to agree in measurements of motion they must first agree on

A

frame of reference

41
Q

for day to day objects, motions are usually measured relative to

A

the surface of the earth

42
Q

what is average speed

A

the speed over the entire trip

43
Q

what is velocity

A

speed in a given direction

44
Q

what is acceleration

A

the rate of change of speed

45
Q

velocity is defined with both —- and —–

A

speed and direction

46
Q

what is the speed formula

A

distance/time

47
Q

what does the slope on a distance vs. time graph represent

A

speed

48
Q

what is the importance of 9.8 meters per second squared

A

it is acceleration due to gravity on earth

49
Q

this is the term for the rate at which velocity changes over time

A

acceleration

50
Q

what does a horizontal line on a velocity vs. time graph represent

A

a constant velocity

51
Q

a curved line on a distance vs. time graph indicates

A

a change in speed

52
Q

graph showing object stopped

A

horizontal line

53
Q

graph showing acceleration

A

curves upwards

54
Q

graph showing constant acceleration

A

diagonal line going upwards

55
Q

speed

A

distance divided by time

56
Q

3 ways to accelerate

A

speed up, slow down, change direction

57
Q

does the mass of objects ever change

A

no

58
Q

what is inertia

A

how difficult it is to change the objects motion

59
Q

an object with high mass or low mass

A

the object has high or low inertia

60
Q

equation for weight

A

weight(w)=mass(m)x gravitational field strength (g)

61
Q

weight is measured in

A

newtons

62
Q

mass is measured in

A

kg

63
Q

does force affect acceleration

A

yes

64
Q

what is acceleration used for

A

to change in speed, direction or a change in both speed and direction

65
Q

what is a resultant force

A

the overall force action on an object

66
Q

what is caused by a resultant force

A

the change in an objects motion

67
Q

how to know if a resultant force is acting on an object

A

If the forces acting on an object are unbalanced (not equal) it means that a resultant force is acting on the object.

68
Q

resultant force equation

A

Resultant force (F) = mass (m) x acceleration (a).

69
Q

what is newtons second law

A

Resultant force (F) = mass (m) x acceleration (a).

70
Q

what is newtons 1st law

A

Newton’s 1st Law says that the velocity of an object will only change if a resultant force is acting on the object. This applies to a stationary (still) or moving object.

71
Q

if the object has no resultant force what does that mean

A

if an objects is stationary and there is no resultant force acting on it it will stay stationary.

72
Q

how to change velocity of an object

A

the velocity will only change if a resultant force is acting on the object

73
Q

what is newtons 3rd law

A

for every action there is an equal and opposite reaction

74
Q

examples of newtons 3rd law

A

If a hand pushes on a table, the table will push back on the hand with an equal force, but in the opposite direction.

75
Q

calculating resultant force

A

Resultant force = forces acting in one direction - forces acting in the opposite direction.

76
Q

newtons 1st law eg

A

When a vehicle is travelling at a steady speed, the resistive forces (such as friction and air resistance) are balancing the driving force.
When there are balanced forces, there is no resultant force.

77
Q

what are the forces acting on a driving car

A

gravity, friction, driving force contact force

78
Q

forces acting on skydiver

A

gravity, air resistance

79
Q

weight of an object

A

The weight of an object is the force that acts downwards on an object due to gravity.

80
Q

what is air resistance

A

air resistance is a frictional force that opposes the motion of objects moving quickly through air.

81
Q

terminal velocity

A

the maximum velocity an object can reach while falling

82
Q

stopping distance

A

stopping distance is the distance it takes a car to stop in an emergency

83
Q

how to find stopping distance

A

thinking distance+ braking distance

84
Q

thinking distance

A

how far the car travels during the drivers reaction time

85
Q

what is braking distance

A

the distance the car travels between the driver applying the brakes and the car stopping

86
Q

eg of factors affecting thinking distance

A

tiredness, drunk,distractions

87
Q

factors affecting braking distance

A

cars initial speed, condition of the car, road condition(wet or icy)

88
Q

how does speed affect work done

A

The greater the speed of a vehicle, the greater the braking force needed to stop the vehicle in a certain distance.

89
Q

Examples of what affects work done

A

Speed of the car
Bigger the mass the greater breaking force needed
Grip of the vehicle

Forces (1 decks)

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