position/displacement/velocity

Question 1

magnitude

Answer 1

size of a measurement or amount you are counting

Question 2

scalar

Answer 2

measurement that has magnitude but not direction (25 seconds)

Question 3

vector

Answer 3

measurement that has magnitude & direction (5 km North)

Question 4

distance (d)

Answer 4

scalar quantity describing length of a path between 2 points (person running 400 m in any path)

Question 5

position

Answer 5

vector quantity describing distance of an object from +
direction of object in relation to reference point
(park 10km North of home)

Question 6

displacement

Answer 6

= final position - initial position (Δ = change in)
vector describing how much object’s position has changed
straight-line distance and direction from 1 point to another
(person running 400m East)

Question 7

time (t)

Answer 7

describes when an event occurs

Question 8

initial time

Answer 8

when an event begins

Question 9

final time

Answer 9

when an event finishes

Question 10

time interval

Answer 10

final time - initial time (scalar)

Question 11

speed (ν): [scalar]

Answer 11

distance an object travels during a given

time interval divided by time interval

Question 12

velocity): [vector]

Answer 12

displacement of an object during
a time interval divided by time interval
- describes how fast an object’s position is
changing
- direction of velocity = direction of displacement
*SI unit of both speed/velocity = metres per second (m/s)

Question 13

Uniform motion

Answer 13

• travelling equal displacements in equal time intervals

- no speeding up, slowing down, or changing direction

Question 14

best-fit line

Answer 14

• smooth curve or straight line that
  most closely fits general shape
  outlined by points on a graph

Question 15

positive slope

Answer 15

• indicates motion in direction
  of positive y axis
• moving away from origin

Question 16

zero slope

Answer 16

• horizontal line

- staying stationary

Question 17

negative slope

Answer 17

• indicates motion in direction
  of negative y axis
• moving toward origin then away
  without changing direction

Question 18

what does rise over run equal?

Answer 18

change in y-axis divided by change in x-axis =
change in position divided by change in time=
= object’s average velocity

Question 19

What does a steeper slope mean?

Answer 19

greater change in displacement

during same time interval

Question 20

average velocity

Answer 20

slope of line that connects

two points on a position-time graph

Question 21

instantaneous velocity

Answer 21

• velocity at a given moment
  (instant) of a trip
• if instant lies on a straight line portion
  of a position-time graph,
  instantaneous velocity = slope of line
• if instant lies on curved portion
  of graph, instantaneous velocity
  = slope of tangent to that point