Key concepts

Question 1

The resolution of a measuring device

Answer 1

The smallest division it’s able to measure

Question 2

Systematic error

Answer 2

A fault with the equipment. The error will be the same every time. e.g +2 grams. Easy to compensate for

Question 3

Random error

Answer 3

An error caused by human error in taking the readings or variations in the environment

Question 4

3 methods of determining levels of uncertainty

Answer 4

1) Halving the resolution of the measuring device, and presenting it at the end of the measurement. e.g 3cm ± 0.5mm

2) Absolute certainty: the uncertainty estimated from adding the uncertainty value for both systematic and random error.

3) Calculating the percentage uncertainty. Useful for when calculating with different units. e.g N and M in the work done equation.

Question 5

Percentage uncertainty equation

Answer 5

±Percentage uncertainty = (±absolute certainty / actual reading) x 100

Question 6

Accuracy

Answer 6

When the values are close to the true value

Question 7

Precise

Answer 7

When the values are close to each other, so the range of values is less

Question 8

Base quantities

Answer 8

Time
Length
Mass
Temperature
Amount of substance
Current
Luminous intensity

Question 9

Vector quantities

Answer 9

Have bath magnitude and direction

Question 10

Scalar quantities

Answer 10

Have magnitude only