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Physics 30 > Unit 1 - Motion > Flashcards

Unit 1 - Motion Flashcards

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1
Q

movement of an object, or any of its parts, from one place to another

A

motion

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2
Q

the study of motion and of the forces that affect their motion

A

mechanics

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3
Q

description of the motion of objects without considering causes of motion

A

kinematics

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4
Q

an examination of what causes the motion

A

dynamics

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5
Q

evidence for motion

A

two objects are in motion if the line segment joining them changes in length or direction or both

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6
Q

the physical quantities

A

time, mass, force

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7
Q

two classifications for physical quantities

A

scalar and vector

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8
Q

any physical quantity that can be described by a magnitude and unit

A

scalar

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9
Q

what must you list for scalar quantities

A

an amount (magnitude) and a unit

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10
Q

a measurement that has magnitude, unit and direction

A

vector

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11
Q

the length of the path travelled by an object as it moves from one location to another

A

distance

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12
Q

is distance scalar or vector

A

scalar

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13
Q

shortest distance

A

position

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14
Q

the location of an object relative to a reference point

A

position

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15
Q

is position scalar or vector

A

vector

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16
Q

the change in position of an object

A

displacement

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17
Q

is displacement scalar or vector

A

vector

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18
Q

which physical quantity requires a reference point

A

position

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19
Q

many = _____________

A

displacements

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20
Q

what can the magnitude (amount) of displacement never be

A

it can never be more than the distance. it can be less than or equal to.

21
Q

where do vectors always go first

A

south or north

22
Q

how are scalar quantities added

A

like positive and negative numbers

23
Q

vector quantities that lie along the same line. they can be in the same direction (parallel,) or in the opposite direction (antiparallel)

A

collinear

24
Q

not parallel. along different angles

A

non-collinear “tip to tail”

25
Q

the rate at which an object travels

A

speed

26
Q

total distance for the motion of objects over the total time

A

average speed

27
Q

speed at a specific time and place

A

instantaneous speed

28
Q

for objects that travel the same distance every second

A

constant speed

29
Q

what physical quantity is speed

A

scalar

30
Q

describes how fast an object is moving and direction

A

velocity

31
Q

what physical quantity is velocity

A

vector

32
Q

displacement over time

A

velocity

33
Q

equal distances in the same direction are being covered in equal time period

A

constant velocity

34
Q

when an object moves at a constant velocity

A

uniform motion

35
Q

the instantaneous speed in a specific direction

A

instantaneous velocity

36
Q

change in position, or the displacement, by the elapsed time

A

average velocity

37
Q

the rate of change of an object’s velocity

A

acceleration

38
Q

if speed or direction changes, an object is ______________

A

accelerating

39
Q

changes velocity by equal amounts in equal intervals of time

A

constant acceleration

40
Q

when velocity changes in a non-uniform way

A

average acceleration

41
Q

calculating the average acceleration for smaller and smaller intervals of time, and eventually obtaining acceleration at an instant

A

instantaneous acceleration

42
Q

straight diagonal line on a position time graph

A

constant velocity

43
Q

horizontal line on a velocity time graph

A

constant velocity

44
Q

parabola on position time graph

A

constant acceleration

45
Q

straight diagonal line on velocity time graph

A

constant acceleration

46
Q

how to find instantaneous velocity

A

the average velocity for an inter is equal to the instantaneous velocity at the half-time point

47
Q

area under the curve

A

displacement

48
Q

moving in the same direction, accelerating in the opposite direction, therefore slowing down

A

negative acceleration

Physics 30 (3 decks)

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