Assignment: Work and Power
Objectives:
- Find out how much work you do when walking up stairs.
- Find out how much power you use.
Materials:
- Phone (timer)
- Ruler or measuring tape
Theory:
Work happens when you use force to move something.
W=F×d
When climbing stairs, the force is your weight, so:
- W=m×g×h
- m= your mass (kg)
- g= 9.8 m/s²
- h= height climbed (m)
- W= work (Joules, J)
Power tells how fast you do work.
P=W/t
- P= power (Watts)
- t= time (seconds)
Procedure:
- Measure your mass (kg).
- Measure the height of one step.
- Count how many steps you climb. Try to climb 1-3 full flights of stairs (about 20-40 steps total).
- Use a timer to record how long it takes you to go up the stairs. Try 2-3 times and use your fastest safe time.
Calculate the following:
Question 1: Your total height climbed, using the equation:
"Height"="step height"×"number of steps"
Question 2: Your work done, using the equation:
W=m×g×h
Question 3: Power, using the equation:
P=W/t
Answer the following questions:
Question 4: Who did more work: a heavier or lighter person? Why? Need Assignment Help?
Question 5: Who had more power: someone faster or slower? Why?
Question 6: What could make your results a little inaccurate?