Catalyst – Tuesday 18th 1. Give two examples of heat convection. Essential Questions: How are temperature and energy related? Where does energy come from and where does it go? How is energy converted into different forms? 1. Give two examples of heat convection. 2. Describe specific heat in your own words. 3. Which of the following substances heats up the quickest? Aluminum = 900 c/J kg K Copper = 390 c/J kg K Iron = 470 c/J kg K 4. Do you remember the law of conservation of energy? Define it in your own words!

Catalyst – Tuesday 18th 1. Give two examples of heat convection. Essential Questions: How are temperature and energy related? Where does energy come from and where does it go? How is energy converted into different forms? 1. Give two examples of heat convection. Heating system, creamer swirling in coffee Describe specific heat in your own words. Energy needed to change temperature. 3. Which of the following substances heats up the quickest? Aluminum = 900 c/J kg K Copper = 390 c/J kg K Iron = 470 c/J kg K 4. Do you remember the law of conservation of energy? Define it in your own words! Yes, it is when matter cannot be created nor destroyed but ONLY change form!

Agenda (10) Catalyst & Answers) (5) Blocks 3&4 Heat transfer rap video (10) Specific Heat worksheet (40) Gallery Notes on KE & PE (20) Teacher Lecture (5) Exit ticket

Catalyst – Tuesday 19th Essential Questions: How are temperature and energy related? Where does energy come from and where does it go? How is energy converted into different forms? 1. What is the formula for Work? 2. What is the formula for Power? 3. If substance A has a specific heat of 5J/C and substance B has a specific heat of 1 J/C, which one will heat up quicker? 4. I do 20J of work on a box and move it 5m, what force did I apply to the box?

Unit 8 - Energy Heat Temperature Thermal Energy Work Power Kinetic Energy Potential Energy

Law of Conservation of Energy Energy is neither created nor destroyed, it can only change form. Example: A flashlight - The energy from the battery is converted into light energy.

Kinetic Energy Kinetic Energy is the energy of motion Write 3 examples of something that would have HIGH Kinetic energy. 1. Running 2. Roller Coaster 3. High speed train motion

Things like:

Kinetic Energy Formula Kinetic Energy Formula = ½ (mass x velocity2) KE (J) = ½ m (kg) x v2 (m/s) 1. Calculate the kinetic energy of a running back that has a mass of 80 kg and is running at a velocity of 8 m/s. KE=2,560 J

Which has more Kinetic Energy??? 1. A bus full of passengers travelling at 25 mph OR an empty bus at 25 mph 2. A toy car moving at 4 m/s OR a toy car sitting at rest on a shelf 3. 7kg bowling ball moving down the alley, 7kg bowling ball at rest. 4. An adult riding a bicycle, a teenager driving a car.

Gravitational Potential Energy Gravitational potential energy is the stored energy of an object as a result of it’s position/height . Higher up = more Potential Energy Write 3 examples of something that would have HIGH POTENTIAL energy 1)Basketball player in the air dunking 2)Air plane in the sky 3)Football in the air

Things like:

Gravitational Potential Energy Formula PEgravitational = mass (kg) x gravity (Ag) x height (m) 2. John has an object suspended in the air. It has a mass of 50 kilograms and is 50 meters above the ground. Find its gravitational potential energy. PEgravitational = 24,500J

Which has more Potential Energy??? 1. An empty box sitting on a shelf OR a full box sitting on the same shelf 2. A 10kg cat at the top of a flight of stairs OR a 3 kg kitten at the top of the stairs 3. A pitcher throwing a baseball OR a softball on the ground. 4. Roller coaster cart on top of the coast OR cart at the bottom of the coaster?

Mechanical Energy Mechanical Energy = Kinetic Energy +Potential Energy Where does the roller coaster have the most Potential Energy? W Where does the roller coaster have the most Kinetic Energy? X Where does the roller coaster have the most Mechanical Energy? W, X, Y,Z Energy goes through a series of transformation and changes. So potential energy turns into kinetic energy and turning back into potential energy. A small quantity of this energy is transferred as heat to the wheels and as vibrations that produce a roaring sound in the air. In a mechanical system such as a roller coater or a swinging pendulum, the energy in the system at any time can be calculated by adding the kinetic and potential energy to get the total mechanical energy. The law of conservation of energy requires that at any given time, total energy should be the same.

Mechanical Energy....What??!? Energy goes through a series of transformation and changes. So potential energy turns into kinetic energy and turning back into potential energy. A small quantity of this energy is transferred as heat to the wheels and as vibrations that produce a roaring sound in the air. In a mechanical system such as a roller coater or a swinging pendulum, the energy in the system at any time can be calculated by adding the kinetic and potential energy to get the total mechanical energy. The law of conservation of energy requires that at any given time, total energy should be the same. https://www.youtube.com/watch?v=LrRdKmjhOgw

Friction and Mechanical Energy Why doesn’t a roller coaster go on forever? Reasons below….. Energy is used for other things. Roller coasters produce heat , the track heats up, etc. Friction is a force that uses some of the mechanical energy in a system. USED, HEAT, USES

Conceptual Understanding A penny is dropped off the Eiffel tower. As it falls, what happens to it’s potential energy? What happens to it’s kinetic energy? As it falls, it’s velocity increases so ….. However, it loses height so …. Mechanical energy stays the same in the air because ….. velocity increases so the kinetic energy increase; it loses height so potential energy decreases; mechanical energy stays the same because the force of gravity is an internal force that does not change the total mechanical energy since gravity is always constant.

Kinetic or Potential? 1. A car is driving down the highway at 65 mph 2. A car is parking at the top of a hill 3. a rubber band zinged from your finger 4. moving a skateboard 5. A glass of milk

Kinetic & Potential Energy Questions 1. What is the potential energy of a 2-kilogram potted plant that is 1 meter-high plant stand? PEgravitational = mgh PEgravitational = (2kg)(9.8m/s2)(1m) PEgravitational = 19.6J 2. What is the kinetic energy of a 3-kilogram ball that is rolling at 2 meters per second? KE = ½ mv2 KE = ½(3kg)(2m/s2) KE = 6 J

For the Final….. Answer: ?

For the Final…. Answer: ?

ET - Kinetic/Potential Energy 3.1.2 1. What is kinetic energy? 2. Object A is sitting 100m above the ground, Object B is sitting 10m above the ground. They are the same size, which has more potential energy? 3. Calculate the kinetic energy of a 3 kg car moving 6 km/s 4. Calculate the potential energy of a box that is sitting 2 m above the ground and has a mass of 2kg 5. Why does a roller coaster lose some energy while running on the tracks? Where does that energy go?

ET – Wednesday 19th When a rock is dropped from a height of one meter, the graviational potential energy of the rock is converted to kinetic energy. When the rock hits the floor and does not bounce, what happends to the kinetic energy of the rock? When one form of energy is converted into other forms of energy, what happens to the total amount of energy?