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Forms of Energy and Energy Transformations

Learn about energy basics, various forms of energy (potential, kinetic), atomic and nuclear energy, chemical energy, heat, mechanical energy, forces, and electricity and magnetism. Explore laws of motion, friction, laws of thermodynamics, and more.

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Forms of Energy and Energy Transformations

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  1. Forms of Energyand Energy Transformations

  2. 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/

  3. Atomic / Nuclear Energy https://www.brainpop.com/science/energy/nuclearenergy/ • 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

  4. 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

  5. Heat (Thermal) • Kinetic energy of particles • More particles = greater heat • Faster moving = greater heat • Transferred 3 ways

  6. 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)

  7. Mechanical Math 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

  8. 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.

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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?

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

  18. Equal and Opposite

  19. Electricity and Magnetism • Electricity • 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

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

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