 # Nature of Energy You use energy when you: hit a softball. lift your book bag. compress a spring.

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Nature of Energy You use energy when you: hit a softball. lift your book bag. compress a spring.

Nature of Energy Living organisms need energy for growth and movement.

Nature of Energy Energy is involved when: a bird flies. a bomb explodes. rain falls from the sky. electricity flows in a wire.

Nature of Energy What is energy that it can be involved in so many different activities? Energy can be defined as the ability to do work. If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy.

Nature of Energy Because of the direct connection between energy and work, energy is measured in the same unit as work: joules (J). In addition to using energy to do work, objects gain energy because work is being done on them.

Forms of Energy The five main forms of energy are: Heat Chemical Electromagnetic Nuclear Mechanical

Mechanical Energy  When you kick a football, you give mechancal energy to the football to make it move.

What is Mechanical Energy? o Energy due to a object’s motion (kinetic) or position (potential). The bowling ball has mechanical energy. When the ball strikes the pins, mechanical energy is transferred to the pins!

Examples of Mechanical Energy

What is Electromagnetic Energy? o Light energy o Includes energy from gamma rays, xrays, ultraviolet rays, visible light, infrared rays, microwave and radio bands

Electromagnetic Energy  Light 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.

What is Electrical Energy? o Energy caused by the movement of electrons o Easily transported through power lines and converted into other forms of energy

What is Chemical Energy? o Energy that is available for release from chemical reactions. The chemical bonds in a matchstick store energy that is transformed into thermal energy when the match is struck.

Examples of Chemical Energy

Nuclear Energy  When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light energy.  Nuclear energy is also released when nuclei collide at high speeds and join (fuse).

Nuclear Energy The sun’s energy is produced from a nuclear fusion reaction in which hydrogen nuclei fuse to form helium nuclei.

Nuclear Energy  Nuclear energy is the most concentrated form of energy.

What is Thermal (Heat) Energy? o Heat energy o The heat energy of an object determines how active its atoms are. A hot object is one whose atoms and molecules are excited and show rapid movement. A cooler object's molecules and atoms will show less movement.

QUIZ TIME! What type of energy cooks food in a microwave oven? ELECTROMAGNETIC ENERGY What type of energy is the spinning plate inside of a microwave oven? MECHANICAL ENERGY

QUIZ TIME! Electrical energy is transported to your house through power lines. When you plug an electric fan to a power outlet, electrical energy is transform into what type of energy? MECHANICAL ENERGY

QUIZ TIME! What energy transformation occurs when an electric lamp is turned on? ELECTRICAL ENERGY  ELECTROMAGNETIC ENERGY

What types of energy are shown below? Mechanical and Thermal Energy (Don’t forget friction)

What type of energy is shown below? Chemical Energy

What types of energy are shown below? Electrical, Mechanical and Electromagnetic Energy

What type of energy is shown below? Chemical Energy

What type of energy is shown below? Thermal Energy

Draw a flow map showing the flow of energy transformations in a car from starting vehicle to driving. You should have 5 different types of energy.

Energy Transfer Chemical Electrical Sound (mechanical) Light (Electromagnetic) Thermal Mechanical

States of Energy  The most common energy conversion is the conversion between potential and kinetic energy.  All forms of energy can be in either of two states: Potential Kinetic

States of Energy: Kinetic and Potential Energy  Kinetic Energy is the energy of motion.  Potential Energy is stored energy.

Kinetic Energy  The energy of motion is called kinetic energy.  The faster an object moves, the more kinetic energy it has.  The greater the mass of a moving object, the more kinetic energy it has.  Kinetic energy depends on both mass and velocity.

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