TOPIC 2 FORCES AND MOTION Flashcards
how do you work out average speed
speed = distance/time
what are the units for average speed
metres/second
if an object travels at a constant speed what else stays the same
it is also travelling the same distance every second
why do we use average speed?
we use average as the speed may vary during the journey.
on a distance/time graph what does a steeper gradient represent
the object is travelling faster
on a distance/time graph what does a horizontal line mean
it means the object is stationary
on a distance/time graph what does a curved line represent
it means the speed of the object is increasing (changing)
how do you work out speed from a distance time graph
speed=gradient- yaxis/xaxis
is speed scalar or a vector quantity
speed is a scalar quantity
what is a scalar quantity?
something that only measures magnitude e.g speed
what is a vector quantity?
something that measure both magnitude and direction
is velocity a speed or a vector quantity
vector
what is the equation for acceleration using velocity and time
acceleration = change in velocity/ time taken
what is does the gradient of a velocity time graph represent
acceleration
what does the area under a velocity time graph represent ?
the distance travelled