Forms and Conservation ENERGY
Nature of Energy Energy is all around you! _______________________. _______________________. ________________________.
What is Energy? Energy is the _______ ______. If an object or organism does _____(exerts a force over a distance to move an object) the object or organism uses _______.
1 _____ = 1 ______-______ Work is a ________ of energy. Because of the direct connection between energy and work, energy is measured in the same unit as work: joules (J). An object that has energy ____ ___________ __________.
Kinetic Energy ___________ __________. KINETIC ENERGY wc ___________ ___________ ___________ __________.
K.E. = ________ KINETIC ENERGY The ______ an object moves, the more ________ _________ it has. Kinetic energy depends on both ____ and ________. The _______ the ____ of a moving object, the more kinetic energy it has.
Potential Energy is _______________ _______________ _______________ Stored chemically in fuel, the nucleus of atom, and in foods. Or __________________ _________________: Stretching a rubber band. Winding a watch. Pulling back on a bow’s arrow. Lifting a brick high in the air. POTENTIAL ENERGY
______________________________ ______________________________ gravitational potential energy. GRAVITATIONAL POTENTIAL ENERGY A waterfall, a suspension bridge, and a falling snowflake all have gravitational potential energy.
PE = _____ GRAVITATIONAL POTENTIAL ENERGY An object’s gravitational potential energy (GPE) depends on its ____, ______, and ____________ due to ________. I. E. If you stand on a 3-meter diving board, you have 3 times the G.P.E, than you had on a 1- meter diving board. G stands for ________ _____________________ It’s value is ____m/s 2
Energy that is _____due to being ________ or _________ is called elastic potential energy. ELASTIC POTENTIAL ENERGY
All energy can be classified as ________, ___________, ______________________. The major forms are: _________ ___________ __________ ___________ __________ FORMS OF ENERGY
_____________ _____________ _____________ ____________. Sum of an object’s ______ and _________ energy. When you kick a football, you give mechanical energy to the football to make it move. MECHANICAL ENERGY
The _____________ of the _____ is called thermal energy, because _______ ________ produce ____. Thermal energy can be ________________. Thermal energy causes _______________ ________________________________ _______________. THERMAL ENERGY
Energy Stored in ______________. Chemical Energy is ___________ ___________________. And when _____ are ______, energy is ________. Fuel and food are forms of stored chemical energy. CHEMICAL ENERGY
Electrical ENERGY Associated with _____________. Batteries convert ___________ into _____________that you then use to power your small appliances. Lightning is an example of electrical energy.
ELECTROMAGNETIC ENERGY Form of energy that _____________________ ______________________. ___________carry electromagnetic energy into your home in the form of electricity. ______ is a form of electromagnetic energy. Each color of light (Roy G Bv) represents a different amount of electromagnetic energy. Electromagnetic Energy is also carried by X-rays, radio waves, and laser light.
NUCLEAR ENERGY _______________________________ ______________. When the _________(fission), _______ ________________________________ ____. Nuclear energy is ________________ __________________________ (fuse).
Energy Conversion Energy can be ______ from one form to another. Changes in the form of energy are called ______ ________________.
Energy conversions _____________________________________ ______________. – The __________through _________can be converted directly into __________. – ___________ convert the sun’s energy (____________) into starches and sugars (_______________).
Other energy conversions – In an electric motor, ____________ energy is converted to ____________ energy. – In a battery, __________ energy is converted into _____________ energy. – The __________ energy of a waterfall is converted to _____________ energy in a _____________.
Energy Conversions In an automobile engine, ___________________ ___________________ ___________________ ______________. The thermal energy is then ___________________ _________________.
________ ______ _________
Kinetic-Potential Energy Conversion Roller coasters work because of the energy that is built into the system. Initially, the cars are pulled __________ up the tallest hill, giving them a great deal of ______________. From that point, the conversion between _______________________ powers the cars throughout the entire ride.
Kinetic vs. Potential Energy At the point of maximum __________ energy, the car has minimum _________ energy.
Kinetic-Potential Energy Conversions As a basketball player throws the ball into the air, various energy conversions take place.
Ball slows down Ball speeds up
The Law of Conservation of Energy Energy can be neither created nor destroyed by ordinary means. – It can only be converted from one form to another. – If energy seems to disappear, then scientists look for it – leading to many important discoveries. – (PE + KE) beginning = (PE + KE) ending
Law of Conservation of Energy In 1905, Albert Einstein said that ____ and ______ can be converted into each other. He showed that if ______ _______, _____________, and if energy is ______________________. E = MC 2