Day 11  Eg and Ek in a System.notebook

1

January 23, 2017

Aug 198:59 AM

11 Graphing Eg, Ek, & TE in a System1/23/17

Question: How can we understand both Eg and Ek AND the Total Energy within a system using a graph?1) Question & TOC 2) Share Notebooks 3) PPT #3 Notes 4) Pendulum Graph 5) Hewitt Problems

Zinszer 3 Eg and Ek in an Energy System 2016.pptx

Day 11  Eg and Ek in a System.notebook

2

January 23, 2017

Aug 198:59 AM

PageDateTable of ContentsTitle for Lesson 

1 Welcome to Physics1/4/17 12-3 Energy Explorations1/5 1/6/17

4 Energy Types PPT1/9/17Types of Energy Questions1/9/17

5 Conservation of Energy 1/10/17

Conservation of Energy & Questions

6 WB Transfer of Energy1/11/17What is Energy? & Questions

7 Energy of Pendulum1/12/17Eg Reading & Questions

Eg Problems8 Test Eg of Swinging Pendulum1/17/179 Calculate Kinetic Energy1/18/1710 Kinetic Energy of Swinging Pendulum1/19/17

11 Eg Ek and TE in a System1/24/17

Ek Reading & QuestionsEk Problems

Attachments

Zinszer 3 Analyze Total Energy 2013.pptx

Zinszer 4 Eg and Ek in an Energy System 2016.pptx

How Can we Analyze the Total Energy in a System?

By Laura Zinszer 2011

Columbia Public Schools & Physics First

All Energy is measured in a unit called a Joule. This unit is used

with all types of energy. It is abbreviated with a J.

To understand total energy in a system, we must calculate both the potential energy and the kinetic energy.

We will then add the Eg and Ek together.

The formula for Total Energy becomes…

TE = Eg + Ek

Let’s start with Gravitational Potential Energy (Eg)

Gravitational Potential Energy (Eg)

To determine the Eg use the formula…

Eg = m * g * h

Where m = mass

g = 9.8

h = height

For example, a 1.5 kg ball held at a vertical position of 20 m above the ground has gravitational potential energy.

Gravitational Potential Energy (Eg)

Gravitational Potential Energy (Eg)

.

Eg = m * g * h

Eg = 1.5kg * 9.8 * 20m

Eg = 294 J

Why would a ball on the ground, have no gravitational potential energy?

Gravitational Potential Energy (Eg).

TBI for Gravitational Potential Energy (Eg)

The higher that an object is elevated, the greater the Eg…

What is Kinetic Energy?

Kinetic Energy is the energy of motion. The amount of Ek depends on the mass and velocity of the object.

Kinetic Energy (Ek)

Kinetic Energy (Ek)

To calculate the kinetic energy, use the formula…

Ek= ½ m * V2

m = mass V = velocity of the object.

If the car has a mass of 1000 kg, and travels at a velocity of 20 m/s, then the Kinetic Energy equals…

Kinetic Energy (Ek)

Kinetic Energy (Ek)

Ek= ½ m * V2

Ek= ½ 1000kg * (20 m/s)2

Ek= 500 kg * 400 m2/s2

Ek= 200,000 J

The greater the velocity or speed of an object, then the greater the Ek!

TBI for Kinetic Energy (Ek)

How do Eg and Ek relate in an energy system?

As the car moves down the track, what happens to the Eg?

As the height is lower, the Eg becomes less.

As the car moves down the track, what happens to the Ek?

The car speeds up, so Ek increases!!!

What is the car’s position on the track when the Eg = Ek?

One-half of the distance down the track.

What happens to the Total Mechanical Energy (TME)?

Total Mechanical Energy (TME) TME = Eg + Ek

The TME will always remain constant!!

As the pendulum swings, the Eg is transformed into Ek…

but the Total Mechanical Energy (TME) remains constant.

What is the position of the pendulum when all energy is Eg?

The pendulum is at the top and not moving.

What is the position of the pendulum when Ek is the greatest?

The pendulum is at the bottom of the swing and fastest!!

What is the position of the pendulum when Eg = Ek?

The pendulum is ½ way through the drop.

As the coaster travels on the track, the Eg is exchanged for the Ek.

but the Total Energy (TME) remains constant.

The BIG IDEA for energy is Total Mechanical Energy in the system is equal to the Eg + Ek….

The Total Energy in the system will always remain constant.

TBI - Energy can not be created or destroyed; it can only be transformed from one type of energy form to another.

Conservation of Energy!

Reflection: What are 2 things you figured out about energy from this PPT??

SMART Notebook

Eg and Ek in an Energy System

By Laura Zinszer 2016

Columbia Public Schools & Physics First

How do Eg and Ek relate in an energy system?

As the car moves down the track, what happens to the Eg?

As the height is lower, the Eg becomes less.

As the car moves down the track, what happens to the Ek?

The car speeds up, so Ek increases!!!

What is the car’s position on the track when the Eg = Ek?

One-half of the distance down the track.

What happens to the Total Energy in this system?

Total Energy = Eg + Ek

The Total Energy in a system will always remain constant!!

As the pendulum swings, the Eg is transformed into Ek…

but the Total Energy remains constant.

What is the position of the pendulum when all energy is Eg?

The pendulum is at the top and not moving.

What is the position of the pendulum when Ek is the greatest?

The pendulum is at the bottom of the swing and fastest!!

What is the position of the pendulum when Eg = Ek?

The pendulum is ½ way through the drop.

As the coaster travels on the track, the Eg is exchanged for the Ek.

but the Total Energy of this Energy System remains constant.

The BIG IDEA for energy is Total Energy in the system is equal to the Eg + Ek….

The Total Energy in the system will always remain constant.

TBI - Energy can not be created or destroyed; it can only be transformed from one type of energy form to another.

Conservation of Energy!

In your notebook: 1. What does “Conservation of Energy” actually mean to you?

2. How does a a swinging pendulum demonstrate the idea of “Conservation of Energy?”

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SMART Notebook

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