Yes, another boring science IAA test. This time it’s physics investigating human power by walking up stairs. I bet the guy who made that experiment up was Steven Hawkins. Anyway, I will tell you mostly everything you will need to know for the test here.
So, as I have already said, this experiment is an investigation into human power. In this experiment the:
Independent variable – Work done (measured in Joules)
Dependant variable – Time (measured in seconds)
Remember, the dependant variable you can’t change and is always on the ‘x’ axis.
Here’s a list of equations you may need for your test:
Work Done = weight X height raised
Power = work done / time taken
Total height = step height X no. steps
Weight = mass X gravity and remember gravity on earth is 10N/kg
Method – these are things that made the method reliable
- Collect the following equipment: a half-metre ruler and 7 stop clocks, a book for recording the data and a pencil or pen.
- Measure the mass of the climber using a set of scales to 1 decimal place.
- Measure the height of several steps to 1 decimal place.
- Average the step height for your measurements.
- Place 7 people at appropriate places on the flight of stairs. Each should have a stop clock.
- Start a countdown for the climber to start AND to start all the stop clocks.
- Each timekeeper should stop their clock immediately when the climber reaches their step. Record the times from each timekeeper in a table.
- Repeat the experiment three times and take an average.
- Ignore any anomalous data and repeat to compensate.
The experiment was made valid by: (point / explanation)
- Keeping the ascendant the same as different people have different walking paces and weights.
- Keeping the time keepers the same as different people will have different reaction times.
- Used the same stairs so ascendant climbed the same height of stairs.
- Same steps the time keepers were places on so that the times will be similar to each other.
- Same type of countdown to stop and prevent any confusion.
The experiment was made reliable by:
- Using seven time keepers, not just one.
- Measure mass of climber to 1 decimal place.
- Average the step height.
- Place time keepers evenly out on the stairs.
- Use a countdown.
- Repeat experiment.
- Average the times.
- Ignore anomalous results and repeat to compensate.