1.4 Linear Motion Flashcards

1
Q

Displacement

A

Vector
Describes how far an object is from where it started

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2
Q

Distance

A

Scalar
Describes overall how object has moved

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3
Q

Speed

A

Rate of change of distance
Scalar

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4
Q

Speed equation

A

Distance/time

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5
Q

Acceleration

A

Rate of change of velocity

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6
Q

What does delta triangle stand for?

A

Change in

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7
Q

Acceleration equation

A

Acceleration = v-u/t

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8
Q

Change in velocity

A

Change in speed and/or direction
Negative of object slowing down

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9
Q

Negative acceleration

A

Retardation/deceleration

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10
Q

Average velocity equation

A

Vav = u+v/2

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11
Q

5 equations of motion

A

V=u+at
S=ut+1/2at2
V2=u2+2as
S=1/2t(u+v)
S=vt-1/2at2

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12
Q

Acceleration under gravitational field

A

G = 9.81 ms-2

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13
Q

Object falling down ‘g’ value

A

Positive - 9.81

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14
Q

Object thrown up ‘g’ value

A

Negative - -9.81

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15
Q

Gradient of a displacement time graph

A

Velocity

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16
Q

Y intercept displacement time graph

A

Initial displacement

17
Q

2 curves coincide displacement-time graph

A

Same displacement at this time

18
Q

Straight line on displacement/time graphs

A

Constant velocity

19
Q

Curved line displacement/time graphs

A

Acceleration

20
Q

Average velocity on displacement/time graphs

A

Slope of straight line connecting end points of curve

21
Q

Instantaneous velocity on displacement/time graphs

A

Slope of the line tangent to curve at any point

22
Q

Positive slope on displacement/time graphs

A

Moving in positive direction

23
Q

Negative slope on displacement/time graphs

A

Moving in negative direction

24
Q

Zero slope on displacement/time graphs

A

State of rest

25
Area under curve of displacement/time graphs
Meaningless
26
Slope of velocity/time graphs
Acceleration
27
Y intercept of velocity/time graphs
Initial velocity
28
2 curves coincide velocity/time graph
2 objects same velocity at that time
29
Straight lines on velocity time graphs
Uniform acceleration
30
Curved lines velocity/time graphs
Non-uniform acceleration
31
Instantaneous acceleration velocity/time graphs
Slope of line tangent to curve at any point
32
Positive slope velocity/time graphs
Increase in velocity in positive direction
33
Negative slope
Increase in velocity in negative direction
34
Area under graph of velocity time graphs
Displacement (vxt)
35
Zero slope in velocity/time graphs
Motion with constant velocity
36
How to calculate average velocity using velocity/time graphs
Calculate displacement Divide by total time taken
37
Apparatus in experiment using light gates and computer software to measure acceleration of free fall,g
Light gate - to start clock Light gate - to stop clock Interrupt card
38
Method for using light gates and computer software to measure acceleration of free fall, g
Set up apparatus Light gates connected to data logging device Software enables time for an object to pass through first gate, through second gate and between cards to be obtained Length of card measured using ruler Hold card at upper light gate so it starts from rest u = 0 Adjust position of lower light gates so it is 2,000cm measured using a metre ruler Set data logger to record the time taken for card to travel between light gates Computer should record time