5 marksA student wanted to exert themselves in light exercise and monitor their heart rate for a period afterwards.
Describe a method they could follow to determine their heart rate after exercise.
4 marksA stopwatch was used to measure how long a student exercised for.
Fig. 1 shows three stopwatches which are ready for the student to use. One of the stopwatches has an error.
Fig. 1
(i)
Identify the stopwatch with the error and state the type of error the stopwatch has.
[2]
(ii)
Describe what the student should do to correct the error.
[1]
(iii)
Identify and explain one type of variable that the time measured by the stopwatch could be in an investigation.
[1]
3 marksStudents participating in an investigation to record their heart rate are considered research subjects. Ethical procedures associated with using students in this way should be followed.
(i)
Describe an ethical consideration that should be considered before students take part in the investigation.
[1]
(ii)
Describe two health and safety precautions which should be adhered to as part of the investigation.
[2]
12 marksA student had a resting heart rate of 75 bpm.
Fig 2. shows the same student's results after completing five different exercises and recording their heart rate each time. Each exercise was carried out for two minutes.
Fig. 2
(i)
Prepare a table to record the results shown in Fig. 2. Your table should include clear headings and units where applicable.
[4]
(ii)
Identify the independent variable and the dependent variable from the information given and Fig. 2.
[2]
(iii)
Use the information above and Fig. 2 to identify the variable that was kept constant during the investigation (control variable).
[1]
(iv)
Describe how the student could make their results more reliable and explain why this increases the accuracy of the data.
[2]
(v)
Calculate the percentage change in heart rate when the student carried out running.
[3]
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