Science

# Work & Power

In Lab 5, please review Chapter 6. Chapter 6 involves walking up a flight of stairs and recording your time via a stopwatch or chronograph. You will be asked to make measurements and calculations for the total time to work the flight of stairs (at least 7 steps) and the vertical height of the stairs from the bottom to the top.

Please Note: There are TWO parts to this lab. The first for running up several steps, and the second to pretend you kept running for one hour. Additionally, your answers should be based on the cost of the runs in terms of ENERGY (KWH) and NOT POWER (kW).

• Fill in the blanks in the Lab Answer Sheet at the end of this lab. THIS LAB IS DUE AT THE END OF THE WEEK.
• Submit this Lab Answer Sheet when all of the labs are completed.
• These can be scanned and sent as pdf or picture files (e.g. tif, gif, etc.) or by any other method of your choice as long as the Answer Sheets are legible and translatable by Grantham University faculty.

The lab details follow:

Purpose:  Determine your work and power as you climb a flight of stairs.

Materials:  Yardstick, a stopwatch or digital/analog watch, bathroom scale, calculator, and you, the climber

Procedure:

• Estimate your mass in kg (Hint: 1 kg (mass) = 2.2 pounds (weight)).
• You should approach the bottom step of the stairs with a steady speed.
• You are to start the time as you reach the first stair and stop the clock when you reach the top

Observations and Data:

• Calculate the work and power for you to climb the flight of stairs
• Work (you) = _____; power (you) = ________
• Calculate your power in kilowatts: (P(kW) = _____.

Application:

• Your local electric company supplies you with 1 kW of power for 1 hour for 8 cents.  Assume that you could climb these stairs continuously for 1 hour.  How much money would this climb be worth?  \$_________.