Paper 3 Mistakes Flashcards
Why might there be uncertainty?
Reaction time
Resolution of equipment
The way the measurement is made
Parallax error
What must always be done when measuring?
Repeat and take a mean for measurments
Precautions to make sure measurements are accurate?
Measure in different places
Check for 0 errors
Bubble Chambers show particles that have?
Both a mass and a charge
Why use a data logger and light gates?
Stopwatch has a reaction time uncertainty
Data Reduces this uncertainty
Light gates may be difficult to use for certain experiments
When dealing with uncertainty with fast objects speak about?
The time interval’s effect on uncertainty, not its speed!
If you wanna get a p.d on zero, what type of circuit should you build?
A potential divider circuit
If a question is asking for a more accurate mean, what do you do?
Remove an outlier
Why should you let a pendulum swing before starting to take measurements?
The initial push may still be affecting the oscillation
What is the spring constant?
Stiffness, so if question is asking about it do some maths to show the effective stiffness based on extension and stuff
With graphical questions, what must you always try and show?
y = mx + c
The uncertainty of a measurement is?
The resolution
The uncertainty of a reading is?
The resolution/2
why use a mean?
To reduce the effect of random errors
What effect does having a high resolution have on accuracy and precision?
None! It doesn’t guarantee either
Talk about % uncertainty instead.
