3. Collection and Presentation of Data

Procedure #6 Horsepower Determination by Pull-ups.

Data Table

Force (N) / Distance (m) / Time #1 (s) / Time #2 (s) / Time #3 (s) / Time #4 (s) / Time #5
(s)
Eric / 667.5 / 0.80 / 2.00 / 1.45 / 1.56 / 1.72 / 1.75
Ashley / 667.5 / 0.68 / 2.10 / 2.07 / 2.21 / 2.29 / 2.36
Joey / 712 / 0.74 / 3.35 / 3.72 / 3.40 / 3.30 / 3.90
Alyssa / 516.2 / 0.74 / 1.64 / 1.76 / 1.59 / 1.51 / 1.96
Tom / 778.7 / 0.80 / 1.71 / 1.61 / 1.81 / 1.92 / 1.86
Brad / 667.5 / 0.80 / 2.10 / 2.11 / 2.25 / 2.06 / 2.62

Sample Calculations Subject 1 (Eric)

1.Determination of weight to be displaced. Converting pounds lifted into Newtons lifted.

150 lbs

/

x

/

4.45 N

/

=

/

667.5 N

1

/

1 lbs

2. Determination of Work Done in one pull-up by Subject 1 (Eric).

Work done = force (weight) x distance displaced.

W = F x d

W = 667.5 N x 0.80 m

W = 534 Nm = 534 J

3. Determination of Power exerted in one pull-up by Subject 1 (Eric).

Power / = / Work done
Time Elapsed
P / = / W
t
P / = / 534 J
2.00 s

P = 267.0 J/s = 267.0 W

4. Sum of Power exerted in 5 pull-ups by Subject 1 (Eric).

Power #1 - #5 = Total Power.

267.0 W + 369.4 W + 342.2 W + 310.4 W + 305.0 W = 1594 W

5. Power exerted in 5 pull-ups converted to horsepower.

1594 W

/

x

/

1 hp

/

=

/

2.125 hp

1

/

750 W

Calculations Table

Work (J) / Power #1 (W) / Power #2 (W) / Power #3 (W) / Power #4 (W) / Power #5 (W) /  Power (W) / Horsepower (hp)
Eric / 534 / 267.0 / 369.4 / 342.2 / 310.4 / 305.0 / 1594W / 2.125
Ashley / 453.8 / 216.0 / 225.6 / 205.2 / 198.1 / 192.2 / 1037W / 1.382
Joey / 526.8 / 157.2 / 141.6 / 154.9 / 159.6 / 135.0 / 748.3W / .9973
Alyssa / 381.8 / 232.8 / 216.8 / 240.0 / 252.0 / 194.7 / 1136W / 1.51
Tom / 622.8 / 364.2 / 386.8 / 344.0 / 324.2 / 334.8 / 1754W / 2.338
Brad / 534 / 254.2 / 253.0 / 237.2 / 259.2 / 203.8 / 1207W / 1.609