Practical skills - paper 1 and 2 Flashcards
To revise key practical terms (Paper 1 and 2)
Define an indépendant variable
The one variable that you change
Define a dependant variable
The variable that you measure
Define a control variable
Any variable you keep the same to make it a fair test
Define directly proportional
If one variable increases the other variable increases at the same rate. eg if x doubles then y must double
Define inversely proportional
If one variable increases the other variable decreases at the same rate. eg if x doubles then y must halve
Define an anomalous result
An result which does fit the pattern of trend
Define interval
The spacing between measurements eg 0, 10, 20, 30 40, 50 cm would have an interval of 10
Define range
The maximum and minimum values eg 0, 10, 20, 30, 40, 50 would have a range of 50 - 0 cm
Define resolution
The smallest change that can be measured with a particular piece of equipment
How can the uncertainty in a measurement be measured?
Half of the range
When should you draw a line graph
When both variables are continuous
When should you draw a bar graph
If one of the variables is discrete or categoric
Define a continuos variable
Can be recored as any number eg time, mass, volume
Define a discrete variable
Can be recored only as a whole number eg number of goals in a match
Define a catergoic variable
Is recored in words instead of numbers eg colours or types of metal