P4: Investigating personal power

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Description and Tags

Physics

GCSE Physics

9th

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9 Terms

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Independent variable

vertical height of stairs

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Dependent variable

time taken to run up stairs

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Controlled variable

mass of the student

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Apparatus

  • Flight of stairs (or stepping platform)

  • Bathroom/ newton scales to measure mass of a student

  • Metre stick or ruler

  • Stopwatch

<ul><li><p>Flight of stairs (or stepping platform)</p></li><li><p>Bathroom/ newton scales to measure mass of a student</p></li><li><p>Metre stick or ruler</p></li><li><p>Stopwatch</p></li></ul><p></p>
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Method

  1. student uses bathroom scales to find mass in kilograms

  2. mass is multiplied by 10 to find force in N

  3. measure height of steps on staircase to determine average height

  4. multiply number steps by average height to find vertical height h of the staircase

  5. another student at the top uses a stopwatch to measure time taken to run up the stairs

  6. experiment should be repeated to find an average

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Results

divide work done (force x vertical height) by time taken

<p>divide work done (force x vertical height) by time taken</p>
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Justification

a heavier person requires more power to complete experiment in same time as a lighter person

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Error

fewer stairs have shorter time and error in measured time increases to an unacceptable level

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Safety

  • running up stairs quickly makes it easy to fall

  • only one person at a time to prevent collisions