Forms of Energy and Energy Transformations

Energy Basics Energy is the ability to do work All forms of energy can be in either of two states: Potential (PE) and Kinetic (KE) When PE KE Potential – stored Dependent on mass and position Larger mass = greater PE Higher up = greater PE Kinetic – moving Dependent on mass and velocity Larger mass = greater KE Greater velocity = greater KE http://www.brainpop.com/games/coastercreator/

Atomic / Nuclear Energy https://www. brainpop Potential energy in an atom Can be split apart (fission) Can be put or fused together (fusion) Mainly used for generating electricity but also used in medicine (diagnosis and treatment) and industry and radiometric dating Click to add text Click to add text

Chemical Energy Potential energy that is stored in the bonds of atoms and molecules; when the bonds are broken the energy is released Sources include: Burning / Combustion Food Fuels/gasoline Batteries Photosynthesis

Heat (Thermal) Kinetic energy of particles Transferred 3 ways More particles = greater heat Faster moving = greater heat Transferred 3 ways Conduction Touching Aluminum bar heats up and transfers energy to the cold water Convection Currents in fluids Hot water rises, cools then sinks where it is heated again Radiation Through space Energy from the Sun reaches Earth through radiation

Mechanical (motion and machines) Kinetic energy in a moving object that is doing work Simple machines are used to provide extra force to move an object (make the work easier)

Mechanical Math Speed = distance / time Some “motion” formulas to consider: Speed = distance / time Velocity = speed in a certain direction Acceleration = ∆Velocity / time Some “machine” formulas to consider: Work = force x distance Power = Work / time MA = output / input ME = output * 100% / input

Newton's Three Laws of Motion First:  An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force. Second The force an object exerts is equal to its mass times its acceleration. Third For every action, there is an equal and opposite reaction.

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force. The object sits there 'til something moves it and moves 'til something stops it Law of inertia Inertia is the ability of an object to resist  change

FORCES can... Make objects move (speed up/slow down) Make objects stop Make objects change direction Forces include: Gravity Magnetic Electrical Resistance ~ FRICTION  Tension (string, rope, cable) climbing a mountain Spring Normal (1 is stable) pushing on a wall

Friction OPPOSES motion Rolling Object rolls over surface, wheels Sliding Two surfaces slide past each other, sliding into home plate Fluid  Air resistance or moving though a liquid, swimming, throwing a ball

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force. Why we wear seatbelts in a car and why airbags deploy

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force. everyday examples: A hockey puck sliding on ice until it hits the boards or a hockey stick A soccer ball sitting on the ground until a player kicks it Zion Williamson's foot going through his sneaker when his sneaker stopped moving...ouch

The force an object exerts is equal to its mass times its acceleration. It is easier to push (force) an empty grocery cart than a larger  cart because the empty cart has less mass

Second Law Calculations: The diagram represents a cart with a mass of 10 kilograms (kg) being pulled to the right with a force of 20 newtons (N).  Using the equation above, calculate the acceleration of the cart in meters per second squared (m/s2). [1]  ______________ m/s2 

A wagon with a mass of 50. 0 kg accelerates 8 A wagon with a mass of 50.0 kg accelerates 8.0 m/s2 when the parent pulls it. What is the amount of the force required?  A force?  How much force would the parent need to use to pull the wagon with 200.0 kg, while keeping acceleration at 8.0 m/s2?

For every action, there is an equal and opposite reaction.

Equal and Opposite

Electricity and Magnetism Flow of electrons Static or current Static Lightning Rubbing foot on rug Balloon on head/wall Current Two kinds: Series – 1 path Parallel – more than 1 path Need: resistor (bulb), wire, battery Also can use: switches Closed = on Open = off Magnetism 2 poles (North and South) Poles are strongest Even if cut in pieces each piece would have N and S poles Opposites attract and likes repel

Light Radiant energy moving in transverse waves and packets (photons) Visible light makes up part of the electromagnetic spectrum