# Practical Skills Flashcards Preview

## Physics, A Level Ocr Spec a > Practical Skills > Flashcards

Flashcards in Practical Skills Deck (13)
1
Q

What is accuracy?

A

How close your result is to the given result

2
Q

What is precision?

A

How close your result is to repeated tests

3
Q

What are errors?

A

The difference between an individual result and the true value

4
Q

What is an uncertainty?

A

An estimate of the range of values within which the true value lies for a measurement.

5
Q

What is the absolute uncertainty when measuring something with a ruler?

A

+/- half the intervals
OR
+/- the interval of measured from top and bottom

6
Q

Percentage uncertainty=

A

(Absolute uncertainty)/(measured value) x 100

7
Q

Having found multiple measurement for the length, what is your estimated value and what if your absolute uncertainty?

A

The estimate value is the mean of the results.

The uncertainty is +/- half the range

8
Q

If you have drawn a graph with a line of best fit and a worst acceptable line of best fit, what is the equations for the % uncertainty of the gradient?

A

9
Q

What if percentage difference? And what is its general equation?

A

The percentage difference between an experimental value and the accepted value.

=(((my result)-(true value)) / (true value)) x100

10
Q

Define independent variable

A

Something you decide to change

11
Q

Define dependent variable

A

The effected variable that you measure (and the result depend on)

12
Q

Define control variables

A

Things you keep the same to have a fair test

13
Q

When using a micrometer there is an inner ring and an outer ring. What does the inner ring go up in and what does the outer ring go up in

A

Inner ring: half a millimetre

Outer ring: 0.1mm