Kinematics Flashcards
difference between reliability and validity
Reliability means that something is consistent time and time again, whereas validity means that the test is a precise way of measuring what it is supposed to measure
formula for acceleration
a = v-u/t
formula for displacement
s = ut+1/2at^2
formula for v^2
v^2 =u^2 +2as
what does the gradient mean in a displacement vs time graph
average velocity
what does the gradient mean in a velocity vs time graph
average acceleration
what does the tangent mean in a displacement vs time graph
instantaneous velocity
what does the tangent mean in a velocity vs time graph
instantaneous acceleration
what does the area under a velocity vs time graph mean
displacement
what does the area under an acceleration vs time graph mean
change in velocity
what does the gradient mean in a displacement vs time^2 graph mean
1/2 a
systematic errors to consider
- a stop watch runs slow or fast
- an instrument not properly zeroed
human errors to consider
- reaction time
- transcriptional error (data written wrong)