Name



Name _____________________________________ Texas High School

Subject __________________, Period ____ Teacher __________________ Date ____________

Lab Worksheet – It’s Too Much Work

Purpose: to determine and calculate the difference between work and power.

Procedure:

A. Record the names and weights of 10 students in this class on your data table (the first one

should be yours).

B. Convert weight to Newtons by multiplying the weight in pounds by 4.45. Record your values

in the data table. (Show the calculations for your weight in question #3.)

C. Calculate the power by using the formula: P = (force x distance)/time. (Show your calculations

in question #4.)

D. Convert the power to horsepower by dividing the power (in watts) by 746. Record your values

in the data table. (Show the calculations for your power in question #5.)

Data Table 1: Work and Power of 10 Classmates

|Name |Weight (lb) |Weight (N) |Height of stairs |Time (sec) |Power (watts) |Horsepower |

| | | |(m) | | | |

| | | | | | | |

| | | | | | | |

| | | | | | | |

| | | | | | | |

| | | | | | | |

| | | | | | | |

| | | | | | | |

| | | | | | | |

| | | | | | | |

| | | | | | | |

Calculations and Questions:

Be sure to show all calculations/steps involved in solving each problem/question.

1. What is the formula for calculating power?

2. One horsepower is equal to 746 watts. Therefore, the formula for converting watts into horsepower is:

HP =

3. Show how you converted YOUR weight from pounds to Newtons. (5 steps)

4. Show how you calculated YOUR power after you ran up the stairs. (5 steps)

5. Show how you calculated YOUR horsepower after you ran up the stairs. (5 steps)

6. List one possible source of error in this experiment.

7. What units are used to measure power? (there are 2)

8. What is the power of a small appliance motor which can do 4000 Joules of work in 20 seconds?

9. How much WORK does a vulture do by flying from the ground to a height of 1000 meters if the vulture has a mass of 3 kilograms?

10. What POWER is produced by this vulture if it soars to 1000 m in 8 seconds?

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