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
in a distance-time graph what do curves represent
acceleration or deceleration
in a velocity-time graph what do curves represent
changing acceleration
in a velocity-time graph what does the gradient represent
acceleration
in a velocity-time graph what do flat sections represent
the object is travelling at a steady speed
what are waves
waves transfer energy without transferring matter
In waves do the particles move
no
What are transverse waves
where the particles ossilate perpendicular to the direction of energy transfer
give three examples of transverse waves
- tidal
- electromagnetic
- seismic S
what are longitudinal waves
where the particles are parallel to the direction of energy transfer
give three examples of longitundinal waves
- sound
- untra-sound
- seismic P
what are the things on the longitudinal waves
compressions and rarefactions
what is the equation for speed
distance / time
in distance-time graphs what does the gradient represent
speed
in velocity-time graphs what does the gradient represent
acceleration
what is the equation for acceleration
(final speed - start speed) / time