Drawing graphs
Drawing graphs
Starter Task: Extension:
How to draw a bar graph Task: Extension:
Axis labels and units
Everything drawn with a ruler
Number of cars
DV always on the y axis
Evenly spaced scales
Bars the same width
Graph fills the page
Axis labels and units
IV always on the x axis
Independent work
Task: using the data draw your own bar graph Extension:
Amount of water (cm3) 0 10 20 30
Number of seeds germinating 0 8 7 10
How to draw a line graph
Axis labels and units
Everything drawn with a ruler
Time (min)
DV always on the y axis
Task: Extension:
Line of best fit ignoring the anomalous result
Graph fills the page
Temperature ⁰C Evenly spaced scales
Axis labels and units
IV always on the x axis
Independent work
Task: using the data draw your own line graph Extension:
Concentration of sulphuric acid 3 (mol/dm )
0.5 1.0 2.0 1.5 2.5
Volume of hydrogen released when sulphuric acid is added to 1 g of magnesium filings in 1 minute 2.0 4.0 6.0 5.5 6.5
Bar or line?
Task: for each decide if you would draw a bar or line graph Extension: justify your answer and Write what you would put on the X and Y axis for each – you need to know which variable goes on which axis
An investigation: 1. into how the temperature of water affects the time a potato take to cook 2. to find how current size affects a bulbs brightness 3. to show how the number of bulbs in a circuits affects the current size 4. to find out how the height a ball bounces is affected by how far it drops 5. to see if plastic, metal or wooden cups keep drinks warm longest 6. to show heart rate is affected by the number of steps up you do 7. to see if a car’s colour makes it go faster 8. to see if light brightness makes plants grow quicker 9. to find if iron rust faster in different concentrations of salty water
Sketch your own graphs
Task: read the statements and sketch the graphs Extension: A. Colin puts a tea bag in a beaker and then adds 50 cm3 of warm water. He then slowly stirs the liquid. Every 15 seconds he takes out 2 cm3 of liquid and measures how dark it is. (he puts the sample back in the beaker) Sketch a graph showing the darkness of the liquid (dependent variable) plotted against time in seconds after the tea bag was added (independent variable). C. Some pupils put some hot water in a beaker. They record its temperature every two minutes as it cools down. The temperature of the classroom is 20oC. Sketch a graph showing the temperature of the water (dependent variable) plotted against time in minutes (independent variable). C. Some pupils wanted to find out how much sugar dissolves in different volumes of water. They went on adding sugar until no more dissolved. For each volume of water they counted how many spoonfuls of sugar dissolved. Sketch a graph showing the number of spoons of sugar (dependent variable) plotted against the volume of water in cm3 (independent variable).
B. Some frozen peas are added to a saucepan containing boiling water. Sketch a graph of the temperature of the water (dependent variable) against the time after the frozen peas were added to the boiling water (independent variable)
E. A person starts eating a “Mars bar”, they bite a small piece off, then chew it and then swallow it. They then bite another piece off and repeat this process until the bar is finished. Sketch a graph of the length of the “Mars bar” (dependent variable) against time after starting to eat the “Mars bar” (independent variable). F. Think about the way that you eat a “Mars bar”, sketch a graph of the length of the “Mars bar” (dependent variable) against time after starting to eat the “Mars bar” (independent variable). Show your graph to your partner and explain its shape.
How you get your ISA marks Task: Extension:
Marks
Bar graph
Line graph
1
X axis scale, units and label
X axis scale, units and label
2
Y axis scale, units and label
Y axis scale, units and label
3
Bars plotted correctly
Points plotted correctly
4
Line of best fit
Plenary Task: Extension:
Starter Task: Extension:
How to draw a bar graph Task: Extension:
Axis labels and units
Everything drawn with a ruler
Number of cars
DV always on the y axis
Evenly spaced scales
Bars the same width
Graph fills the page
Axis labels and units
IV always on the x axis
Independent work
Task: using the data draw your own bar graph Extension:
Amount of water (cm3) 0 10 20 30
Number of seeds germinating 0 8 7 10
How to draw a line graph
Axis labels and units
Everything drawn with a ruler
Time (min)
DV always on the y axis
Task: Extension:
Line of best fit ignoring the anomalous result
Graph fills the page
Temperature ⁰C Evenly spaced scales
Axis labels and units
IV always on the x axis
Independent work
Task: using the data draw your own line graph Extension:
Concentration of sulphuric acid 3 (mol/dm )
0.5 1.0 2.0 1.5 2.5
Volume of hydrogen released when sulphuric acid is added to 1 g of magnesium filings in 1 minute 2.0 4.0 6.0 5.5 6.5
Bar or line?
Task: for each decide if you would draw a bar or line graph Extension: justify your answer and Write what you would put on the X and Y axis for each – you need to know which variable goes on which axis
An investigation: 1. into how the temperature of water affects the time a potato take to cook 2. to find how current size affects a bulbs brightness 3. to show how the number of bulbs in a circuits affects the current size 4. to find out how the height a ball bounces is affected by how far it drops 5. to see if plastic, metal or wooden cups keep drinks warm longest 6. to show heart rate is affected by the number of steps up you do 7. to see if a car’s colour makes it go faster 8. to see if light brightness makes plants grow quicker 9. to find if iron rust faster in different concentrations of salty water
Sketch your own graphs
Task: read the statements and sketch the graphs Extension: A. Colin puts a tea bag in a beaker and then adds 50 cm3 of warm water. He then slowly stirs the liquid. Every 15 seconds he takes out 2 cm3 of liquid and measures how dark it is. (he puts the sample back in the beaker) Sketch a graph showing the darkness of the liquid (dependent variable) plotted against time in seconds after the tea bag was added (independent variable). C. Some pupils put some hot water in a beaker. They record its temperature every two minutes as it cools down. The temperature of the classroom is 20oC. Sketch a graph showing the temperature of the water (dependent variable) plotted against time in minutes (independent variable). C. Some pupils wanted to find out how much sugar dissolves in different volumes of water. They went on adding sugar until no more dissolved. For each volume of water they counted how many spoonfuls of sugar dissolved. Sketch a graph showing the number of spoons of sugar (dependent variable) plotted against the volume of water in cm3 (independent variable).
B. Some frozen peas are added to a saucepan containing boiling water. Sketch a graph of the temperature of the water (dependent variable) against the time after the frozen peas were added to the boiling water (independent variable)
E. A person starts eating a “Mars bar”, they bite a small piece off, then chew it and then swallow it. They then bite another piece off and repeat this process until the bar is finished. Sketch a graph of the length of the “Mars bar” (dependent variable) against time after starting to eat the “Mars bar” (independent variable). F. Think about the way that you eat a “Mars bar”, sketch a graph of the length of the “Mars bar” (dependent variable) against time after starting to eat the “Mars bar” (independent variable). Show your graph to your partner and explain its shape.
How you get your ISA marks Task: Extension:
Marks
Bar graph
Line graph
1
X axis scale, units and label
X axis scale, units and label
2
Y axis scale, units and label
Y axis scale, units and label
3
Bars plotted correctly
Points plotted correctly
4
Line of best fit
Plenary Task: Extension:
