Unit 5 Relationships among forms of energy 8

  • Slides: 30
Download presentation
Unit 5 Relationships among forms of energy 8 th Grade Middle School science Union

Unit 5 Relationships among forms of energy 8 th Grade Middle School science Union township school district S

Energy S The ability of a system to do work. Two types of energy:

Energy S The ability of a system to do work. Two types of energy: • Kinetic Energy • Potential Energy

Energy All forms of energy can be in either of two states: KINETIC ENERGY

Energy All forms of energy can be in either of two states: KINETIC ENERGY POTENTIAL ENERGY

What’s the difference? S Kinetic Energy is the energy of MOTION S Potential Energy

What’s the difference? S Kinetic Energy is the energy of MOTION S Potential Energy is STORED energy due to an objects position.

Kinetic Energy – what does it depend on? The faster an object moves (velocity)

Kinetic Energy – what does it depend on? The faster an object moves (velocity) , the more kinetic energy it has. ¡ The greater the mass of a moving object, the more kinetic energy it has. ¡ Kinetic energy depends on both mass and velocity. ¡

Some types of kinetic energy include… S Electrical - The energy that an electric

Some types of kinetic energy include… S Electrical - The energy that an electric current carries is a form of kinetic energy. S Radiant - the energy carried by electromagnetic waves. S Sound - energy carried by sound waves S Seismic - is the energy transferred by waves moving

Calculating Kinetic Energy What has a greater affect of kinetic energy, mass or velocity?

Calculating Kinetic Energy What has a greater affect of kinetic energy, mass or velocity? Why?

What is the unit for Kinetic Energy? S

What is the unit for Kinetic Energy? S

Practice Problem 1 S What is the Kinetic Energy of a 150 kg object

Practice Problem 1 S What is the Kinetic Energy of a 150 kg object that is moving with a velocity of 15 m/s?

Practice Problem 2 S What is the Kinetic Energy of a 1200 kg object

Practice Problem 2 S What is the Kinetic Energy of a 1200 kg object that is moving with a velocity of 24 m/s?

Practice Problem 3 S What is the Kinetic Energy of a 478 kg object

Practice Problem 3 S What is the Kinetic Energy of a 478 kg object that is moving with a velocity of 15 m/s?

Practice S What is the Kinetic Energy of a 150 kg object that is

Practice S What is the Kinetic Energy of a 150 kg object that is moving with a speed of 15 m/s? S An object has a kinetic energy of 25 J and a mass of 34 kg, how fast is the object moving? S An object moving with a speed of 35 m/s and has a kinetic energy of 1500 J, what is the mass of the object.

Potential Energy S Stored energy that depends on the interaction of objects, particles, or

Potential Energy S Stored energy that depends on the interaction of objects, particles, or atoms.

Some types of Potential Energy include… l Gravitational potential energy - stored energy

Some types of Potential Energy include… l Gravitational potential energy - stored energy due to an objects position (height) - depends on mass of the object and its distance from earth. l Elastic potential energy – - Stored energy due to compression or expansion of an elastic object

Some types of Potential Energy include… l Chemical energy - energy that is

Some types of Potential Energy include… l Chemical energy - energy that is stored in and released from the bonds between atoms. l Nuclear– energy stored in and released from the nucleus of an atom.

Calculating Potential Energy • If you are given Newton’s (N) that is the product

Calculating Potential Energy • If you are given Newton’s (N) that is the product of mass and gravity. • A Newton is a force • Gravity (acceleration due to gravity) = 9. 8 m/s 2 on Earth.

What unit do we use for Potential Energy? S

What unit do we use for Potential Energy? S

1. You serve a volleyball with a mass of 2. 1 kg. The ball

1. You serve a volleyball with a mass of 2. 1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has ______ energy. Calculate it.

2. A baby carriage is sitting at the top of a hill that is

2. A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 N. The carriage has ______ energy. Calculate it.

3. A car is traveling with a velocity of 40 m/s and has a

3. A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. The car has ______energy. Calculate it.

4. A cinder block is sitting on a platform 20 m high. It has

4. A cinder block is sitting on a platform 20 m high. It has a mass of 5 kg. The block has _______ energy. Calculate it.

5. A roller coaster is at the top of a 72 m hill

5. A roller coaster is at the top of a 72 m hill and weighs 966 N. The coaster (at this moment) has ______ energy. Calculate it.

6. Two objects were lifted by a machine. One object had a mass of

6. Two objects were lifted by a machine. One object had a mass of 2 kilograms, and was lifted at a speed of 2 m/sec. The other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec. a. Which object had more kinetic energy while it was being lifted? b. Which object had more potential energy when it was lifted to a distance of 10 meters? Show your calculation.

A combination of Kinetic and Potential Energy S Thermal - The sum of the

A combination of Kinetic and Potential Energy S Thermal - The sum of the kinetic energy and potential energy of the particles that make up an object S The motion of the particles PLUS the distance between the particles. S Mechanical - The sum of potential energy and kinetic energy in a system of objects. S The motion of the object PLUS the objects position

¡ As a basketball player throws the ball into the air, various energy conversions

¡ As a basketball player throws the ball into the air, various energy conversions take place.

Law of Conservation of Energy S Energy can be neither created nor destroyed by

Law of Conservation of Energy S Energy can be neither created nor destroyed by ordinary means. S Energy can be transformed or transferred from one form to another. S The total amount of before energy is the same and after any transformation or transfer.

Energy Transfer S Energy TRANSFER is the passing of energy from one object to

Energy Transfer S Energy TRANSFER is the passing of energy from one object to another object. Example: A cup of hot tea has thermal energy. Some of this thermal energy is transferred to the particles in cold milk, in which you put to make the coffee cooler.

Energy Transformation S A change from one form of energy to another.

Energy Transformation S A change from one form of energy to another.

Energy Transformation S An objects energy can be: 1. All Kinetic Energy 2. All

Energy Transformation S An objects energy can be: 1. All Kinetic Energy 2. All Potential Energy 3. A combination of both S As velocity increases kinetic energy increases and potential energy decreases S As velocity decreases kinetic energy decreases and potential energyincreases WHAT IS THE TYPE OF RELATIONSHIP KE AND PE HAVE? INVERSE

Identify the following: Greatest Potential Greatest Kinetic Least Potential Least Kinetic Area where both

Identify the following: Greatest Potential Greatest Kinetic Least Potential Least Kinetic Area where both kinetic and potential energy is almost even.

UNIT 5 RELATIONSHIPS AMONG FORMS OF ENERGY 8UNIT 5 RELATIONSHIPS AMONG FORMS OF ENERGY 8
Normal Forms Relationships Among Normal Forms Relations inNormal Forms Relationships Among Normal Forms Relations in
LONG FORMS CONTRACTED FORMS SHORT FORMS Long formsLONG FORMS CONTRACTED FORMS SHORT FORMS Long forms
Weak forms strong forms Weak forms strong formsWeak forms strong forms Weak forms strong forms
Forms Forms and Forms n What forms ofForms Forms and Forms n What forms of
Weak forms strong forms Weak forms strong formsWeak forms strong forms Weak forms strong forms
FORMS OF EMPLOYMENT RELATIONSHIPS Forms of employment relationshipsFORMS OF EMPLOYMENT RELATIONSHIPS Forms of employment relationships
Forms of Energy Forms of Energy All energyForms of Energy Forms of Energy All energy
ENERGY Energy Energy exists in many forms EnergyENERGY Energy Energy exists in many forms Energy
Energy Potential Kinetic Energy Forms Energy Energy isEnergy Potential Kinetic Energy Forms Energy Energy is
Energy Kinetic Energy Forms of Energy Potential EnergyEnergy Kinetic Energy Forms of Energy Potential Energy
Forms of Energy energy kinetic energy potential energyForms of Energy energy kinetic energy potential energy
Energy Forms of Energy Kinetic Energy Energy ofEnergy Forms of Energy Kinetic Energy Energy of
Forms of Energy Five Forms of Energy ThereForms of Energy Five Forms of Energy There
Forms of Energy Part II Forms of EnergyForms of Energy Part II Forms of Energy
Forms of Energy 5 Fundamental Forms of EnergyForms of Energy 5 Fundamental Forms of Energy
Energy Section 14 6 Forms of Energy FormsEnergy Section 14 6 Forms of Energy Forms
FORMS OF ENERGY FOLDABLE Foldable Energy Forms ChemicalFORMS OF ENERGY FOLDABLE Foldable Energy Forms Chemical
Forms of Energy Forms of Energy 1 AllForms of Energy Forms of Energy 1 All
Forms of Energy Forms of Energy o AllForms of Energy Forms of Energy o All
Energy Forms and Changes Forms of Energy TheEnergy Forms and Changes Forms of Energy The
Day 3 Forms of Energy Forms of EnergyDay 3 Forms of Energy Forms of Energy
Energy Forms and Changes Forms of Energy TheEnergy Forms and Changes Forms of Energy The
Google Forms Google Form Google Forms Google FormsGoogle Forms Google Form Google Forms Google Forms