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Physics > Physics test 9th grade #1 > Flashcards

Physics test 9th grade #1 Flashcards

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1
Q

Speed formula

A

distance/time

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2
Q

Speed definition

A

The speed of an object is given by the ratio between distance travelled and time taken

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3
Q

Are average speed and actual speed the same

A

No, actual speed changes while average speed does not

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4
Q

how is speed measured

A

Km/h
m/s
mph

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5
Q

What is the magic triangle

A

Distance/speed x time

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6
Q

How fast

A

speed - distance/time

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7
Q

how far

A

distance - speed x times

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8
Q

how long

A

time - distance/speed

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9
Q

difference between speed and velocity

A

speed is about movement in general while velocity is speed with direction

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10
Q

Vector

A

A quantity that has value (magnitude) as well as a direction. Number + Unit + direction

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11
Q

Scalar

A

A quantity that is represented by a simple numerical value. Number + unit

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12
Q

is velocity is vector or scalar

A

vector

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13
Q

Is speed a vector or scalar

A

Scalar

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14
Q

What symbol is used to represent velocity?

A

an arrow.

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15
Q

is weight a scalar is vector or scalar

A

weight is a vector

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16
Q

is acceleration a vector or scalar

A

vector

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17
Q

What do the details that the symbol that represents velocity tell us

A

Length = magnitude/size
Direction = direction

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18
Q

What is acceleration

A

when there is a change in velocity:
- speed increases (positive acceleration)
- speed decreases (negative acceleration)
- change in direction

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19
Q

When acceleration occur

A

when there is a change of speed, direction, or both

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20
Q

acceleration formula

A

a = (v - u) / t
a = acceleration
u = initial speed
t = time

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21
Q

When speed increases it is called

A

positive acceleration

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22
Q

when speed decreases its called

A

negative acceleration

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23
Q

In distance time graphs, whats on the x axis and whats on the y axis

A

distance is on the y axis, time is on the x

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24
Q

In a distance time graph, a straight flat line represents…

A

no movement (v=0)

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25
Q

In a distance time graph, positive constant speed is show as…

A

a straight line going vertically up

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26
Q

In a distance time graph, if there are two lines, how do you determine which one is greater

A

look at the distance both lines are at at the same time to determine which one is greater

27
Q

In a distance time graph, how do u represent negative constant speed

A

a straight line going down

28
Q

How do you show acceleration on a distance time graph

A

it is a slope. Negative goes down and positive goes up

29
Q

What is the formula to find the slope

A

rise/run

30
Q

In a distance time graph, are the slope and speed related

A

yes, mathematically speaking, the slope is the speed because rise/run = distance/time

31
Q

In speed time graphs, what does no movement look like

A

a straight line on the x axis

32
Q

In speed time graphs, what does constant positive speed look like

A

A straight line not on the x axis

33
Q

In speed time graphs, how is negative speed represented

A

by a line under the x axis

34
Q

In speed time graphs, what does a diagonal line going up represent

A

positive acceleration

35
Q

In speed time graphs, what does a diagonal line going down represent

A

negative acceleration

36
Q

In speed time graphs, how to you determine which line is greater

A

whichever is higher up

37
Q

In speed time graphs, what is the slope equivalent to

A

acceleration.
slope = rise/run = speed/time
acceleration = speed/time = rise/run

38
Q

How do you find the distance on speed time graphs?

A

Find the area of the shape made by the line. For a rectangle it would be speed x time. For a triangle it would be 1/2 speed x time

39
Q

What happens to an object after its released

A

it falls with increasing speed which is acceleration

40
Q

Why do objects fall

A

gravity

41
Q

when do heavier objects fall faster than lighter ones

A

when theres air resistance

42
Q

what 2 forces act upon an object

A

gravity and air resistance

43
Q

what affects air resistance

A

the shape of the object

44
Q

If there was no air resistance, how would this affect objects

A

all objects would fall with the same acceleration. This is called the acceleration of free fall or g

45
Q

the speed at which an object falls in a vacuum depends on…

A

the local gravitational field strength

46
Q

What does g stand for

A

the acceleration of free fall

47
Q

What is the acceleration of free fall

A

The acceleration of objects falling without air resistance

48
Q

What is the g on Earth

A

approximately 10

49
Q

Will an object fall faster on the moon or earth (with no air resistance)

A

The earth because it has a stronger gravitational field than the moon does

50
Q

If an object is moving under free fall, its velocity is given by

A

v = g x t
or
v = 10t

51
Q

How do you find the distance of an object that is accelerating free falling

A

5t^2 where t = time
This is because normally you would do 1/2 speed x time. Speed is 10t. so it is 1/2 10t x t. This can be simplified to 5t^2

52
Q

What is free fall

A

falling because of the force of gravity without air resistance

53
Q

if a rock fell for 3 seconds what would be its velocity and distance travelled

A

v = 30
d = 45m

54
Q

what is free fall?

A

anything that is released into the air. For example, even throwing something up is considered free fall

55
Q

How do you find velocity and distance when an object is launched straight up in the air (free fall)

A

as the object moves up, the velocity decreases by ten. as it goes down, it repeats the sequence in reverse (increases by 10)

56
Q

If an arrow was shot straight up for two seconds at an initial speed of 20, what is its velocity every second

A

t = 0 v = 20
t = 1 v = 10
t = 2 v = 0
t = 3 v = 10
t = 4 v = 20

57
Q

How do you find the distance of an object in free fall when its shot up straight in the air

A

the total time squared times 5.
For example, 4 x 4 = 16. 16 x 5 = 80

58
Q

Newtons first law

A

an object in motion will stay in motion unless another force acts upon it

59
Q

Newtons third law

A

for every action, there is an equal and opposite reaction

60
Q

force formula

A

force = acceleration x mass

61
Q

how to draw a force diagram

A

four arrows showing four forces
- earth pushing up
- gravity
- friction/ air resistance
- momentum from vehicle

resultant force: bigger force - smaller force

62
Q

mass vs weight

A

Mass is the total amount of matter, or “stuff,” in an object. Weight is the force of gravity on an object.
w = mass x 10

63
Q
A

Physics (5 decks)

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