P9 Motion Flashcards
what is a vector quantity
A quantity which has both magnitude (size) and a direction
define velocity
the speed of an object in a certain direction
What is the difference between speed and velocity
speed is just how fast something is going with no regard if direction it is a scalar quantitiy
velocity is speed in a given direction it is a vector quantity
define distance
how far an object has moved
what is a scalar quantity
a measure that doesn’t involve direction
what is the typical speed of someone walking
1.5m/s
what is the typical speed of someone running
3m/s
what is the typical speed of someone cyclinng
6m/s
what is the typical speed of a car
25m/s
what is the typical speed of a train
30m/s
what is the typical speed of a plane
250m/s
what will affect the speed someone travels at
- fitness
- age
- terrain
- wind speed
- pressure
what is acceleration
how quickly something is speeding up
in a distance-time graph what does a steeper gradient represent
a faster speed
in a distance-time graph what does a flat section represent
the object is stationary