P H Y S I C S Introduction

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P H Y S I C S Introduction to Work, Power & Kinetic Energy

P H Y S I C S Introduction to Work, Power & Kinetic Energy

What is Work? n What do you think of when you think of work?

What is Work? n What do you think of when you think of work?

Work Displacement Force Work is done when a force acts parallel to the direction

Work Displacement Force Work is done when a force acts parallel to the direction of the displacement Force Displacement

Work Air Resistance Force Displacement Work is done when a force acts parallel to

Work Air Resistance Force Displacement Work is done when a force acts parallel to the direction of the displacement F ric Fo tion rce Dis pla ce me nt

Work or Not? n n Man holds out heavy concrete block at arm’s length

Work or Not? n n Man holds out heavy concrete block at arm’s length for 10 minutes NOT WORK Student pushes car down street WORK Women holds up a large box over-head while walking down the hall way NOT WORK Child pushes a cart along the side walk WORK

What is kinetic energy? n What do you think of when you think of

What is kinetic energy? n What do you think of when you think of kinetic energy?

Kinetic Energy n n Any moving object has kinetic energy Amount depends on 1)

Kinetic Energy n n Any moving object has kinetic energy Amount depends on 1) velocity 2) mass

Kinetic Energy Equation n

Kinetic Energy Equation n

Kinetic Energy

Kinetic Energy

Work-Energy Theorem n

Work-Energy Theorem n

Work-Energy Theorem n +W increases KE WORK

Work-Energy Theorem n +W increases KE WORK

Formula for Work n n W = f * d W Work (J) f

Formula for Work n n W = f * d W Work (J) f Force (N) d Displacement (m)

What is power? n What makes something powerful?

What is power? n What makes something powerful?

Power n The rate at which work is done

Power n The rate at which work is done

Work vs. Power n Power accounts for “how fast” work is done A B

Work vs. Power n Power accounts for “how fast” work is done A B

Power Equation n

Power Equation n

Power Equation n

Power Equation n

Household Appliances n n n n 60 W light bulb - 60 W Toaster

Household Appliances n n n n 60 W light bulb - 60 W Toaster : 800 -1500 W Microwave : 600 -1500 W Dishwasher : 1200 -1500 W Washing Machine : 500 W Vacuum Cleaner : 200 -700 W Clothes dryer : 4000 W Ceiling Fan : 10 -50 W Hair Blow dryer : 1000 W Laptop Computer : 20 -50 W Desktop Computer : 80 -150 W Cell Phone Charger: 3 -5 W i. Pod/i. Pad Charger: 10 W

Time to explore Power n n What do we need to know to calculate

Time to explore Power n n What do we need to know to calculate power? What is your force? So if 1 lb=2. 2 kg how much mass do you have? How can we calculate velocity?

On a sheet of paper n n n Calculate your Fg. Now let’s go

On a sheet of paper n n n Calculate your Fg. Now let’s go to the stairs and see who can generate the most power. When we get back calculate your power. This paper is your exit slip. You can’t leave until it’s done.

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