Power Lab

Power Scenario

Proper technique, not sure why he is jaundiced.

Within the ACS weight room the arguments continue. Which technique is more useful: explosive power or raw strength? Two Vipers are engaged in a squat competition. While performing a squat lift, Abe can raise 170-kg, 0.95 m in a time of 1.5 s. The 87-kg athlete claims that regardless of the amount of time needed to raise the bar, it is all about the maximum mass you can lift. Sixty-four kilogram Zeb on takes 0.95 s to lift a 110kg squat a distance of 1.15-m.

Determine the work done and power of each athlete.

Match the athlete with the appropriate sport and/or position.

Determine the Horsepower of each athlete. (1 hp = 746 W)

Power as rate of energy transfer

Power P is the rate of doing work. It is measured in Watts (W) – named after the Scottish inventor and engineer James Watt (1736-1819). 63 years after Watt's death, the British Association gave his name to the unit of electrical power - and today James Watt's name is to be found written on almost every light bulb in the world. 1 Watt equals 1 Joule per second. Watt also created the term horsepower (1 hp = 746 W).

Power is the rate of doing Work or changing energy.

Since:

We can substitute...

Therefore,

Power is also the speed at which a force moves.

Some Additional Resources

Power Lecture Notes

Energy Transfer and Power Problem Solving

Please make a copy of the following document: Energy Transfer and Power

Submit a copy of your work on the Google Classroom assignment: Energy Transfer and Power

This also listed on 02.3e - Work Done a System

Power Lab

Using the equipment in the lab,

Choose a scenario (body part to test).
1. Free weights
2. Body weight exercises
3. Exercise bands/cords
Design an experiment to test who (out of 5 people) is the most powerful of the scenario.

Guidelines:

Focus on design and data collection

Determine quantities you will need to measure, specify symbol for quantity (table to right).
Indicate the equipment you are going to use (table to right) to measure necessary quantities.
Draw a clearly labeled diagram, include where the measurements/variables are located on your diagram.
Describe (briefly) how you would use the equipment to conduct the experiment
Determine the calculations you will need to make from your measurements.
Define the terms you use in your experiment
Data points and trials:
1. Use the table to the right to create your data table.
2. A minimum of 5 data points (People).
3. With a minimum of 3 trials.
Name a source of error….NOT human error
1. How does the error affect the results

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