CHAPTER 15 ENERGY RESOURCES Vocabulary Review Quizlet Ch

CHAPTER 15: ENERGY!

RESOURCES Vocabulary Review: Quizlet Ch 15 Doodle Science Playlist: High School Physics BILL Nye: Energy (30 min. )

Kahoot to review OR work on late work quietly Review: Quizlet Live : Ch. 15 ENERGY Terms Kahoot – Work Power Machines Kahoot - ENERGY

SMart. Starter List as many types and forms of energy as you can think of! (Feel free to represent them in drawing form if you would rather)

SS –Phys Sci List three different ways you have used energy today. Where does the energy you use come from?

SS –Phys Sci L M 1. 2. 3. 5. 4. Where is the highest PE? Why? Where are the PE and KE almost the same? How do you know?

SS –Phys Sci --- Follow up Where is the highest PE? Where are the PE and KE almost the same?

At what point would a car on the track have the greatest PE? KE? Explain WHY? ! B F C G D A E Lab Questions: How does height affect speed? How does PE affect KE?

SS –Phys Sci An object has a kinetic energy of 14 J and a mass of 17 kg , how fast is the object moving?

Smart. Starter - How many questions have you completed on your EXAM Study Guide? How many do you have left? When specifically will you make time to complete them?

Attendance & Good Things!

Smart. Starter - ANSWER Who has the most done on their STUDY GUIDE? Good Job!!! Preparation proceeds Success!

Watch HBO VICE: The Future of ENERGY (25 min. ) h c t a to w k lin k c i Cl Assignment: On a piece of paper, write 10 facts about alternative energy that you learn from this video. …don’t forget your name and period

…or teach them how to be successful in life through wise stories

Energy: The ability to do work Work = Force x distance

ENERGY

Energy The ability to do work (F*d). THERMAL internal motion of particles MECHANICAL NUCLEAR ENERGY Motion or position of objects changes in the nucleus ELECTRICAL CHEMICAL bonding of atoms joules (J) motion of electric charges

Forms of Energy: Kinetic: energy of movement (depends on mass and velocity) Bozeman AP Physics Kinetic & Potential Energy Kinetic Energy

Forms of Energy: Potential: energy of position - gravitational: depends on mass, height and acceleration due to gravity - elastic: depends on ability to be stretched or compressed - chemical: stored in bonds - electrical: associated with charge - nuclear: stored in the atomic nucleus - electromagnetic: waves (light/rays/sound)

Calculating Potential Energy m = mass (kg) g = acceleration due to gravity (9. 8 m/s 2) h = height (m) PE = potential energy (Joules) Doodle Science GPE and Kinetic Energy

Calculating Potential Energy Example Problem A mover carries a television with a mass of 62 kg a distance of 18 m up the stairs. How much potential energy does the TV have? PE = (62)(9. 8)(18) = 10, 937 J

Calculating Potential Energy PE = (m)(g)(h) Practice Problem A 74 kg man at the top of a ladder is 8 m off the ground while attaching Christmas lights. How much potential energy does the man have? PE = (74)(9. 8)(8) = 5, 802 J

Calculating Kinetic Energy m = mass (kg) v = velocity (m/s) KE = kinetic energy (Joules)

Calculating Kinetic Energy What is the kinetic energy of a 75 -kg student running at a speed of 3 m/s?

Kinetic Energy (KE) energy in the form of motion depends on mass and velocity • Which has the most KE? 80 km/h truck • Which has the least KE? 50 km/h motorcycle 80 km/h 50 km/h 80 km/h

Practice: KE Math A silverback gorilla can run at a speed of about 25 mph (11. 2 m/s). The tallest gorilla recorded was a 1. 95 m (6 ft. 5 in) silverback with an arm span of 2. 7 m (8 ft. 10 in), a chest of 1. 98 m (6 ft 6 in), and a weight of 219 kg (483 lb), shot in Alimbongo, northern Kivu in May 1938. What would the kinetic energy of the gorilla be if it had charged the shooter?

Practice: KE Math A silverback gorilla can run at a speed of about 25 mph (11. 2 m/s). The tallest gorilla recorded was a 1. 95 m (6 ft 5 in) silverback with an arm span of 2. 7 m (8 ft 10 in), a chest of 1. 98 m (6 ft 6 in), and a weight of 219 kg (483 lb), shot in Alimbongo, northern Kivu in May 1938. What would the kinetic energy of the gorilla be if it had charged the shooter?

Practice: KE Math The maximum operating speed of a N 700 bullet train is 320 km/h. The mass of a 16 car set is 715 metric tons. What is the kinetic energy of a N 700 Bullet Train at its top operation speed? HINTS 1 metric ton = 1000 kg 1 m/s = 3. 6 km/h

The Law of Conservation of Energy is never created or destroyed – it is transformed from one form to another. (PE+KE)Beginning = (PE+KE)End

ENERGY Transformations EXAMPLES: PE KE mechanical thermal chemical thermal PE KE

Conservation of Energy: Example Problem If 2500 -kg roller coaster car begins its descent from 500 m above the first hill, what is its kinetic energy at the bottom of that hill? PE = (2500)(9. 8)(500) = 12, 250, 000 J = KE!

The Law of Conservation of Energy Often, kinetic energy will be transformed into thermal energy, via FRICTION. This is the reason we always LOSE efficiency when work is done!

Mechanical (ME = KE + PE) Thermal

Conservation of Energy: Practice Problem Happy Gilmore. -> PG-13 : / Happy's Long Drive If 0. 5 kg golf ball begins its descent from a long drive 30 m above the green, what is its mechanical energy at that moment if the ball is traveling at 90 m/s (~200 mph)? ME = PE + KE FUN FACT: The highest recorded ball speed is 226 mph by Connor Powers during the Quarterfinals of the 2014 World Long Drive Championship.

Smart. Starter Give two examples of non-renewable energy resources AND Give two examples of renewable energy resources

Renewable & Nonrenewable Energy Sources

Renewable & Nonrenewable Energy Sources Renewable Energy 101 | National Geographic (3 min. )

Renewable Energy APES Renewable Energy BOZEMAN -9 min.

Energy Resources History of Human Energy Use: CC 7 min. Non-renewable Energy Resources: Doodle Renewable Energy Resources: Doodle 1 & Doodle 2 Which country runs on 100% renewable energy? 4 min Energy National Grid NOVA Energy Lab - Discovery Channel: Powering the Future (article) National Geographic Channel - Free Power Energy Future Prospect (44 min. ) NOVA 2011 – Power Surge

EARTH DAY How well do you know your planet? Jeopardy 4 Teams In Energy Folder…

YOUR TURN TO DOODLE Writing/Drawing Assignment On a piece of paper draw & LABEL: 1. A building with a purpose of your choice (i. e. gym/school/house, etc. ) 2. Must use 4 types of Energy Resources Strive for a sustainable design. 3. Write a paragraph about your building: What is its purpose? How does the design conserve energy? What energy resources does it use? Is this practical? Could you market this design? Why or Why not?

Exploring Alternative Energy Sources Day 1: Research HW -- 9 different topics + others Day 2: Poster or g. CR Slides – Rubric DRAFT Day 3: Summary Grid Share – Notes Grid

Ch. 15 - Energy I. Energy and Work & Energy Conservation of Energy u u

A. Energy THERMAL The ability to cause change. internal motion of particles MECHANICAL NUCLEAR ENERGY motion of objects changes in the nucleus ELECTRICAL CHEMICAL bonding of atoms joules (J) motion of electric charges

A. Energy Kinetic Energy (KE) energy in the form of motion depends on mass and velocity • Which has the most KE? 80 km/h truck • Which has the least KE? 50 km/h motorcycle 80 km/h 50 km/h 80 km/h

A. Energy Potential Energy (PE) stored energy depends on position or configuration of an object • Which boulder has greater gravitational PE? • What other ways can an object store energy?

B. Work transfer of energy through motion force exerted through a distance W = Fd W: F: d: work (J) force (N) distance (m) 1 J = 1 N·m Distance must be in direction of force!

B. Work l Brett’s backpack weighs 30 N. How much work is done on the backpack when he lifts it 1. 5 m from the floor to his back? GIVEN: F = 30 N d = 1. 5 m W = ? WORK: W = F·d W = (30 N)(1. 5 m) W = 45 J W F d

B. Work l A dancer lifts a 40 kg ballerina 1. 4 m in the air and walks forward 2. 2 m. How much work is done on the ballerina during and after the lift? GIVEN: m = 40 kg d = 1. 4 m - during d = 2. 2 m - after W = ? W F d WORK: W = F·d F = m·a F =(40 kg)(9. 8 m/s 2)=392 N W = (392 N)(1. 4 m) W = 549 J during lift No work after lift. “d” is not in the direction of the force.

C. Conservation of Energy Law of Conservation of Energy may change forms, but it cannot be created or destroyed under ordinary conditions. EX: ENERGY CONVERSIONS PE KE mechanical thermal chemical thermal

C. Conservation of Energy PE KE View pendulum animation. View roller coaster animation.

C. Conservation of Energy Mechanical Thermal View rolling ball animations. View skier animation.

Energy and MASS E=mc 2 E: energy (J) M: mass (kg) C: speed of light (3. 0 X 108 m/s) Einstein showed that mass and energy are equivalent and can be converted into each other.

Energy and MASS E=mc 2 E: energy (J) M: mass (kg) C: speed of light (3. 0 X 108 m/s) How much energy is released if 1 gram of matter is completely converted into energy?

YOUR TURN TO DOODLE Writing/Drawing Assignment On a piece of paper draw & LABEL: 1. A building with a purpose of your choice (i. e. gym/school/house, etc. ) 2. Must use 4 types of Energy Resources Strive for a sustainable design. 3. Write a paragraph about your building: What is its purpose? How does the design conserve energy? What energy resources does it use? Is this practical? Could you market this design? Why or Why not?

POTENTIAL ENERGY Practice Problems

POTENTIAL ENERGY Practice Problems

Kinetic Energy Practice Problems 1. What is the Kinetic Energy of a 150 kg object that is moving with a speed of 15 m/s? 2. An object has a kinetic energy of 25 J and a mass of 34 kg , how fast is the object moving? 3. 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. 4. What is the Kinetic Energy of a 1200 kg object that is moving with a speed of 24 m/s? 5. An object has a kinetic energy of 14 J and a mass of 17 kg , how fast is the object moving? 6. An object moving with a speed of 67 m/s and has a kinetic energy of 500 J, what is the mass of the object. 7. What is the Kinetic Energy of a 478 kg object that is moving with a speed of 15 m/s? 8. An object has a kinetic energy of 88 J and a mass of 45 kg , how fast is the object moving? 9. An object moving with a speed of 21 m/s and has a kinetic energy of 140 J, what is the mass of the object. 10. What is the Kinetic Energy of a 100 kg object that is moving with a speed of 12. 5 m/s?

An object has a kinetic energy of 14 J and a mass of 17 kg , how fast is the object moving?

Energy Resources History of Human Energy Use: CC 7 min. Non-renewable Energy Resources: Doodle Renewable Energy Resources: Doodle 1 & Doodle 2 Energy National Grid

HEAT – Thermal Energy Transfer Ch. 16. 1 & 16. 2 -- Thermodynamics Kinetic Theory – energy determines state of matter What is heat? Transfer of thermal energy from one object to another Heat Transfer Conduction & Convection Radiation What is temperature? Measure of heat compared to a reference point (degrees)