How To Measure Data Validly / Just Measure Differnt Things Flashcards
With a pendulum, and vary heights, how to do
- ensure let go with 0 velocity so NO PUSH
- ensure the string is taught !
How to measure mass
Top pan balance
How to measure something moving, and height?
Use grid ruler as scale so it’s everywhere
- slow motion move to avoid parallax
How to measure time periods (from where)
Measure from centre of oscislltion due to amplitude changing, use fiduciary marker
ALWYAS take averages , even if using video camera
WHERE to measure masses etc from
From thr CENTREPOINT of the mass ( not centre OF mass)
How to measure using a ruler ACCURATKEY
from base up, use a set sqaure
And now make measure you look eye level to avoid PARALLAX ERROR
How to measure disrance for trapdoors
From bottom of ball to top of trapdoor, remember bottom of ball hits first
Else just measure to centre of mass
How to ensure SMALL AMPLITUDES
Swing through small angles of less than ten, measured either using trig or a protractor
This might be needed for validity questions
What makes equipment sensible to use
3 points
1) if it can measuee the max thing , such as charging
2) if by the time the data exceeds sensitivity, you can get 8-10 values, then perfect as enough
3) if the resolution gives good percentages of 1m to 1.5% MAX then good
