Displayed Velocity (mph)	Displayed Velocity (m/s)	Revolutions	Distance covered (m)	Time (s)	Actual velocity (m/s)	Error (%)
3	1.34	10	36	24.19	1.5	-11.9
6	2.68	20	72	25.52	2.8	-4.5
9	4.02	30	108	26.06	4.1	-2

1. Why is it important to calibrate the equipment used when making measurements? What measurement principle is being checked by calibration? Based on the table above. Does the display on the treadmill overestimate or underestimate treadmill speed?

2. Which exercises in this lab measured absolute work and which measured relative work? (Treadmill velocity calibration, treadmill operation, cycle ergometer, bench step) Which ergometer(s) would be most difficult for a smaller person? Which types of exercise would be harder if the subjects wore a heavy backpack? Explain.

Treadmill velocity calibration

Dispalyed Velocity (mph)	Displayed Velocity (m/s)	Revolutions	Distance covered (m)	Time (s)	Actual velocity (m/s)	Error (%)
3	1.34	10	36	24.19	1.5	-11.9
6	2.68	20	72	25.52	2.8	-4.5
9	4.02	30	108	26.06	4.1	-2

treadmill operation

Grade (%)	Angle ()	Vertical distance (m)	Work (J)	Power (W)
0	0	0	0	0
5	2.86	8.83	5540.1	30.78
10	5.71	17.61	11048.83	61.38

cycle ergometer

Resistance (kg)	Power (W)	Work done in 2 min (J)
0	0	0
0.5	36	4320
1	72	8640
1.5	108	12960
2	144	17280

bench step

Step cadence	Step cadence (rpm)	Time-to-complete 20 step (s)	Work (J)	Power (W)
Slow	15	73	5144.8	70.48
Moderate	20	58	5144.8	88.7
Fast	25	47	5144.8	109.46

3. How much work would it take an 80-kg individual to climb the 110 steps from the Northbound Metro Silver Line bus stop on the Cal State San Marcos campus. Assume the standard step height of 7 inches (17.8 cm). Show your calculations. Would the amount of work done or power change if the person lost weight? Would the amount of work done or power change if the person climbed the stairs faster? Explain your answers.