KE and GPE – conservation of energy! Practice problems KE and GPE Draw a Swing – Label where GPE is highest – Label where KE is highest – Label where GPE is lowest – Label where KE is lowest Roller coaster on board (explanation of GPE and KE)

Bellwork QUiz Which energy would be highest if you were standing on top of a 20 meter building? A. Kinetic energy B. Thermal energy C. Gravitational potential energy D. All of these would be equal

Energy conversions on a Coaster 25 points Coaster drawing = 5 points Coaster analysis = 20 points Neatness/appearance = 5 points

Design Your Roller Coaster! – Name the coaster ( 1 point) – Include height (in meters) of 3 points on the coaster ( 1 points) – Include 3 spots where gravitational potential energy is almost 0 ( 1 point) – Include 3 spots where kinetic energy is almost 0 (1 point) – Include a 3 cart car (label mass of cart – choose a REASONABLE mass) (1 point)

Analyze your coaster – Put a square on the 3 places of the coaster you believe the cart will have the HIGHEST GPE. (2 points) – Put a circle on ALL of the spots where the coaster has almost 0 KE. (2 points) – Put a heart on ALL the spots the coaster will have almost 0 GPE. (2 points) – Put a star on the spot of the coaster you believe the cart will have the HIGHEST kinetic energy. (2 points) ANSWER ON BACK (complete sentences – at least 5 each): – What do you notice about the location of your shapes? (3 points) – How is energy conservation demonstrated in your roller coaster? (3 points) – How do energy conversions relate to energy conservation? (3 points)

Forms of Energy Where’s Waldo Energy Find

Bellwork Quiz A piece of wood on the ground contains: A. Gravitational potential energy B. Kinetic energy C. Thermal energy D. Chemical energy

Renewable-nonrenewable

Important Concepts THE SUN! provides ALL energy on Earth. We get our energy to move etc. from the FOOD we eat (which is CHEMICAL energy) Energy is NEVER lost but can change into heat from FRICTION Kinetic energy is affected MORE by velocity than mass (think of equation) Electricity produced from MECHANICAL energy of a turbine! (WHAT makes the turbine move changes…wind/water/steam) Solar panels use energy from sun to make the electrons “jump”/flow on the panel into wires

Non-Renewable Energy Energy TypeWhere does it come from? HOW does it work?Pros/consAbundance OilFound deep in Earth’s surface created from buried marine organisms under extreme temp. & pressure. -Gas burned -Heats water -Steam turns turbine -Mechanical energy converted -to electrical energy Pros: Gives great speed and distance for transportation and relatively abundant Cons: CO2, greenhouse gases, oil spills, Timely Cannot be found everywhere 50 years or less Natural GasFound in deep underground rock created from buried marine organisms under extreme temp. & pressure. -Gas burned -Heats water -Steam turns turbine -Mechanical energy converted -to electrical energy Pros: affordable, clean, abundant, employment, efficient, Cons:CO2 (less than oil/coal), explosive (dangerous), extensive pipelines Abundant ( years left) CoalFound deep in Earth’s surface created from buried plant material under extreme temp. & pressure. -Gas burned -Heats water -Steam turns turbine -Mechanical energy converted -to electrical energy Pros: cheap, abundant. Jobs, versatile, Cons: difficult/dangerous to mine, CO2, other pollutants LOTS! Enough for another 250 years at current usage. Nuclear fissionSplitting the nucleus of a uranium atom produces e large amount of heat energy. -Nucleus split (releases HEAT) -Heats water -Steam turns turbine -Mechanical energy converted -to electrical energy Pros: lower CO2, cheap operating cost, large power generating capacity (cities/industries) Cons: Large construction cost, high risk, terrorism target, waste lasts yrs, meltodowns Common/abundant

Renewable Energy Energy sourceWhere does it come from? HOW does it work?Pros/ConsAbundance? hydroelectricMovement of waterRunning water moves turbine Pros: no pollution Cons: Space, environmental impact on organisms (dams) Running rivers sometimes hard to find – not as abundant as other sources SolarThe sunSun hits panel with enough energy to make electrons in panel “jump”/flow through wire Pros: no pollution, remote locations, less dependent on fossil fuels, Cons: installation price, weather, pollution affects panels Limitless GeothermalDeep Inside EarthHeat from earth makes water boil. Steam turns turbine. Mechanical - electrical Pros: emission free, no fuel required, Cons: location specific, far from population centers, expensive construction, difficult to drill into rock Limitless WindWind produced from uneven heating from sun. Wind mill moves turbine. Mechanical to electrical. Pros: clean, free energy once infrastructure is built Cons: inconsistent wind, eye sore, noise, wildlife Need enough SPACE to put hundreds of windmills. BiomassLiving organisms.-Bacteria decompose organic waste and release methane (to burn) -Burning wood Pros: abundant, low cost, low carbon Cons: deforestation, some CO2, large land utilization Abundant, but takes time for trees to grow back OceanMovement of water.Water movement turns turbines Pros: emission free, efficient, predictable Cons: expensive, location specific, animal impact Few sites (about 20) with high potential

What to study Word problems using KE and GPE equation Vocabulary from online text Renewable and Non-renewable facts (chart) Examples/explanation of the conservation of energy Example/definition of each TYPE of energy (electromagnetic, mechanical, sound etc.)