Unit 07

“Work, Power, Energy and Energy

Conservation”

Purpose: •The purpose of this activity is to investigate work, power and energy through inquiry.

Directions: 1.Record your mass in the data table below.2.Time how long it takes you to run or walk up the stairs in the hallway, record this time below.3.Record the vertical distance you covered during this time.4.Calculate your Force, Work, Power and Energy for this exercise.

Class Data:Student Mass

(kg)Time

(s)Force

Applied(N)

Distance Covered

(m)

Work Done

(Joules)

Power(Watts)

Energy Used

(Joules)

Ms Bucci 70 7.50 686 3.9m(1 flight)

2675 357 2675

Ms Sully

70 7.50 686 7.8m(2 flights)

5351 713 5351

MeWalking

Me Running

Force

Force

Work Done Work Done

Power (walking)

Power (walking)

Power (running) Power (running

Calculations: Part IMs Bucci Me

Calculations: Part IICalculate how many 60 Watt light bulbs Ms Bucci could light by running up the steps.

Calculate how many 60Watt light bulbs you could light by running up the steps.

How can you change how much work you can do?

What doesn’t change the amount of work you can do?

Calculations: Part IIIStudent Energy Used

(calories)4.184 Joules = 1 calorie

Candy Bar

Energy in Candy Bar

calories

Number of Flights to burn off Energy

Ms Bucci

Me

How do you know how much energy your legs have used to bring you up the steps?

What type of energy does the candy bar have?  What type of energy is the energy from the candy bar converted to when moving up the steps?