Do NowMonday, November 18,

2013Periods 1&2 get ready for

your Unit #5 Exam. Afterwards, you will

complete your guided notes using the ppt online.

3.5 minutes

Do Now Check

Do NowMonday, November 18,

2013What is Newton’s 3rd Law of

Motion? Provide a real-world example of Newton’s

3rd Law.

3.5 minutes

Do Now Check

By the end of the day today, IWBAT…•Compare and contrast kinetic and potential energy•Calculate kinetic and potential energy

Why it matters in LIFE: Energy is what allows us to move!

Why it matters in THIS CLASS: This is a HUGE topic that is central to your understanding of everything we will be doing this semester.

What it might look like on a test…

Agenda

Do Now 7 min

Energy C-Notes 15 min

Kinetic or Potential? 8 min

Graphic Organizer Summary

5 min

Practice Questions 10 min

Exit Ticket 5 min

Unit Cover SheetsTrackers

Unit 6: Work, Power, and Energy

Monday, 11/18/13TEKS:

P 6.B - Investigate examples of kinetic and

potential energy and their

transformations

By the end of today, IWBAT…

Compare and contrast kinetic and potential

energyCalculate kinetic and

potential energyEssential Question:What is the difference

between kinetic and potential

energy?

Topic:Energy

Put this into your C-Notes!

What is energy?

ENERGY is the ability to make things move or change

Measured in Joules (J)

Forms of energy

Energy can exist in many different forms and changes from one form to another

Kinetic and Potential Energy

For this unit, we are going to be focusing on the energy of movement

Two main types: Kinetic and Potential

Kinetic Energy

KINETIC ENERGY is the energy of motion

Depends on mass and velocity

Kinetic Energy

Which has a higher maximum kinetic energy, my first car or the camaro? Why?The camaro has more KE because it has a higher velocity.

Kinetic Energy

Which would hurt more, getting hit by a 15 foot wave or a 2 foot wave? Why?

The bigger wave would hurt more because even though they travel at the same speed, the bigger wave has more mass.

Kinetic Energy

Formula:

KE = ½mv2

mass (in kg) velocity (in

m/s)

Kinetic Energy

The bird has a mass of 2 kg. It is flying at a speed of 5 m/s. Find its kinetic energy.KE = ?m = 2 kgv = 5 m/s

KE = ½mv2

KE = ½(2 kg)(5 m/s)2

= 25 J

Potential Energy

An object with POTENTIAL ENERGY has the ability (or potential) to move or change

Sometimes called “energy of position” or “stored energy”

There are 3 types of potential energy: Gravitational Potential Energy Elastic Potential Energy Chemical Potential Energy

Gravitational Potential Energy Potential Energy due to an object’s

position Formula:

PE = mghmass (in kg)

acceleration of gravity (9.8 m/s2)

height (in meters)

Gravitational Potential Energy

•The person has more potential energy at the top of the stairs than at the bottom.

Gravitational Potential Energy

Where does the egg have more potential energy? Why?

Gravitational Potential Energy If your egg drop device has a mass of 2

kg, how much potential energy does it hold at a height of 10 meters?

PE = ?m = 2 kgg = 9.8 m/s2

h = 10 m

PE = mgh

PE = (2 kg)(9.8 m/s2)(10 m) = 196 J

Elastic Potential Energy

Potential energy due compression or expansion of an elastic object

Chemical Potential Energy

Potential energy stored within the chemical bonds of an object

Every pair will receive a whiteboard and a marker.I will put a picture up on the board.You will have 30 sec to decide whether the picture represents kinetic or potential energy.Do not put your board up until I say. Be prepared to defend your answer!

Kinetic or Potential?

Kinetic or Potential?

Kinetic or Potential?

Kinetic or Potential?

Kinetic or Potential?

Kinetic or Potential?

Kinetic or Potential?

Kinetic or Potential?

Graphic Organizer Summary

Potential

Gravitational

Elastic

Chemical

Kinetic

KE = ½ mv2

Joules (J)

PE= mgh

mass velocitymass position

Practice Problems

10 min to complete the practice problems

Work together Show all of your work!! Raise your hand if you have a question

Exit Ticket

Complete the questions silently and independently

Hand it to me on your way out when the bell rings

Remember – I want to see your BEST work!