Chapter 8 - Motion Flashcards
What is a scalar quantity?
Quantities that describe magnitude only
Ex: 500 m
What is a vector quantity?
Quantities that describe magnitude and direction
Ex: 500 m [south]
Describe distance.
A scalar quantity that describes the length of a path between 2 points or locations.
Ex: 10km
SI unit = metres (m)
Describe position.
Vector quantity that describes an objects location as seen by the observer.
Ex: 20km [south] from home to store
SI unit = metres (m)
Describe time and time interval.
TIME is to describe when an even occurs.
The difference between initial and final time is TIME INTERVAL.
BOTH are SCALAR quantities
SI unit = seconds (s)
Describe displacement.
Describes the straight line distance direction from one point to another.
VECTOR quantity
Ex: 7m [east]
SI unit = metres (m)
What is negative?
West, left, south, and down.
What is positive?
East, right, up and north
What is uniform motion?
Equal displacements in equal time intervals
Best-fit line?
Smooth or straight curve line that most closely fits the points
What is a positive slope?
Slants up to the right is positive.
What is a negative slope?
Slants downward, is negative, returns back to the origin in a position time graph
In a velocity time graph it is slowing down.
What is zero slope?
An object is at rest in a position time graph, but is in constant motion in a velocity time graph
What is velocity?
Displacement of an object during a time interval divided by a time interval. It is a VECTOR quantity
ex: 8m/s or 8km/h
SI unit = m/s or metres per second
What is average velocity?
The rate of change in position for a time interval
