760 likes | 1.06k Views
ENERGY. April 19, 2004 BY: BRIANNA SHIELDS. DO NOW- Element, Compound, Mixture. 1. What type of matter is copper? 2. What type of mixture is a cup of beans, rice and sunflower seeds? 3. What type of mixture is a can of paint?. GOAL.
E N D
ENERGY April 19, 2004 BY: BRIANNA SHIELDS
DO NOW- Element, Compound, Mixture • 1. What type of matter is copper? • 2. What type of mixture is a cup of beans, rice and sunflower seeds? • 3. What type of mixture is a can of paint?
GOAL • TO IDENTIFY THE FIVE MAIN TYPES OF ENERGY AND DESCRIBE ENERGY TRANSFORMATIONS
Energy 1. The ability to do work 2. When work is done, energy is used What is energy?
Mechanical 1. Energy associated with motion- movement of particles The five main types of energy
Mechanical 2. Examples Airplane propeller Waterfall Wind Walking Hitting a ball Sound energy The five main types of energy
Heat 1. The motion of particles and how fast they move 2. Faster movement = more heat The five main types of energy
Heat 3. Examples Created when you rub hands together Causes ice to melt and water to boil The five main types of energy
Chemical 1. Required to bond atoms together 2. When bonds break, energy is released The five main types of energy
Chemical 3. Examples Start a fire to release it Shoot off a rocket Digesting food Using muscles to play sports The five main types of energy
Electromagnetic 1. Created by moving electric charges 2. Associated with electricity and light The five main types of energy
Electromagnetic 3. Examples Power lines Electric motors Light energy (colors of light) X-rays, radios, laser light The five main types of energy
Nuclear 1. Created by splitting the nucleus of an atom 2. Powerful!! 3. Ex: Atomic bomb The five main types of energy
Label the type of energy used: • a. Ice cream cone melting • b. Earthquakes
Label the type of energy used: • c. Volcanoes • d. Lightning
Label the type of energy used: • e. Lizard crawling • f. Someone shouting
Label the type of energy used: • g. Digesting food • h. Dropping a bomb
Label the type of energy used: • i. Rainbows • j. Playing a guitar (as well as sound coming out)
Label the type of energy used: • k. Radio • l. Launching a space shuttle
Energy Conversions 1. Changing one type of energy into another Energy Conversions
Energy Conversions Examples A. Battery: Chemical --> Electromagnetic Energy Conversions: Battery
Energy Conversions B. Electric Motor: Electromagnetic--> Mechanical Energy Conversions: Electric Motor
Energy Conversions C. Car engine = chemical ---> heat---> mechanical (fuel burned--> heated up--> car moves/runs) Energy Conversions: Car Engine
Energy Conversions D. Microphone = mechanical --> electromagnetic---> mechanical Sound --> electricity--> into loudspeaker---> creates sound Energy Conversions: Microphone
Energy Conversions E. Flashlight = chemical (batteries) ---> electromagnetic (electricity)---> electromagnetic (light) Energy Conversions: Flashlight
Energy Conversions F. Hair dryer = chemical (coal) ---> heat (steam)---> mechanical (turbine)--> electromagnetic (electric)--> heat and mechanical (dryer) Energy Conversions: Hair Dryer
Describe the energy conversions • Water is boiled. The resulting steam is blown against huge turbine blades. The turning blades spin in a magnetic field, producing electricity. Describe in order, the energy conversions • ANSWER: heat energy--> mechanical energy--> electromagnetic energy
Describe the energy conversions • Corn growing during the summer due to photosynthesis. • ANSWER: electromagnetic (light) energy--> chemical energy (photosynthesis)--> mechanical energy (growth)
Describe the energy conversions • Battery lighting a light bulb • ANSWER: chemical--> electromagnetic
Electro-magnetic Mechanical Types of Energy Nuclear Chemical Heat
Kinetic Types of Energy Potential
Kinetic Energy 1. The energy of motion or movement 2. The faster something is, the more KE it has Kinetic Energy
Kinetic Energy Examples: A. Soaring tennis ball Kinetic Energy
Kinetic Energy Examples: B. Car driving Kinetic Energy
Kinetic Energy Examples: Flung rubberband Thrown Baseball Kinetic Energy
Kinetic Energy Examples: E. Falling Object Kinetic Energy
KINETIC ENERGY: Examples • Which has more KE………… • A fast ball or a curve ball in baseball? • An airplane flying or a car driving? • A running rabbit or a walking turtle? • HOW DO YOU KNOW THIS?
Kinetic Energy Formula KE = 1/2 mv^2 KE = kinetic energy M= mass (kg) V= velocity Kinetic Energy
KINETIC ENERGY: Example • Which has more kinetic energy? A 1 kg fast ball going 100m/s or a 1kg curve ball going 50 m/s? Show your calculations
KINETIC ENERGY: Example • Which has more kinetic energy? A 10kg turtle going 5 m/s or a 2 kg rabbit going 25 m/s? • How could you make the rabbit have more kinetic energy than the turtle?
Potential Energy 1. Energy of position = stored energy 2. The higher an object is in position, the more PE it has
Potential Energy 3. Examples A. Compressed spring
Potential Energy B. Stretched rubberband
Potential Energy C. An archer’s bow pulled back
Potential Energy D. House sitting on a hill
Potential Energy E. Golf club wound back
Potential Energy F. Trampoline pushed down
Potential Energy Formula: PE = mgh PE= potential energy M= mass (kg) G= 9.8 m/s^2 H= height (m)
POTENTIAL ENERGY: Examples • Which has more potential energy- a 10kg box on a 12 meter tall shelf, or a 10kg box on a 5 meter shelf. Show your calculations for this. • How could you increase the potential energy of the box on the 5 meter tall shelf?
ASSESSMENT • Stacked wood logs