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Science Yr 9 > Kinematics > Flashcards

Kinematics Flashcards

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1
Q

What is Kinematics?

A

the branch of physics describing motion

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2
Q

What is distance?

A

how far an object has travelled

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3
Q

What is time?

A

how long it takes for an object to travel

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4
Q

What is speed?

A

the rate of change of an object’s position

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5
Q

What is scalar quantity?

A

a quantity that has size but no direction e.g. speed, time, distance

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6
Q

What is a vector quantity?

A

a quantity with both size and direction e.g. displacement, velocity, acceleration

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7
Q

What is displacement?

A

the change in position of an object, with direction

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8
Q

What is velocity?

A

speed of an object in a certain direction

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9
Q

How to calculate distance?

A

speed x time

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10
Q

How to calculate time?

A

distance / speed

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11
Q

How to calculate speed?

A

distance / time

distance travelled
—————————- or
time taken

                       d2 - d1 s (average) =  ----------------
                       t2 - t1
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12
Q

What is average speed?

A

the average of instantaneous speeds over a period of time

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13
Q

What is instantaneous speed?

A

how fast an object is moving in a single moment

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14
Q

What does the gradient of a distance-time graph give?

A

speed

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15
Q

What does the gradient of a speed-time graph give?

A

acceleration

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16
Q

How to find distance travelled on a speed-time graph?

A

find area beneath speed-time graph gradient

17
Q

What is acceleration?

A
  • a change in velocity i.e. speeding up, slowing down, changing direction
18
Q

What unit is used for acceleration?

A

m/s/s or m/s^2 (squared)

19
Q

What is an increase in velocity called?

A

positive acceleration or acceleration

20
Q

What is a decrease in velocity called?

A

negative acceleration or deceleration

21
Q

How to calculate average acceleration?

A

change in velocity
——————————- or
time taken to change

final speed - initial speed v2 - v1
————————————– —> a (average) = —————-
final time - initial time t2 - t1

22
Q

How to calculate average velocity?

A 
      time
23
Q

What does the gradient of a velocity-time graph give?

A

acceleration in a direction

24
Q

If positive and negative directions are not defined…

A

positive acceleration means getting faster and negative acceleration means slowing down

25
Q

If positive and negative terms are defined…

A

for something travelling in a negative direction, negatively accelerating means increasing speed

Science Yr 9 (5 decks)

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