KE Energy and PE Energy Powerpoint no equations manipulated.pptx
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Potential energy is stored energy due to an object's position or shape, while kinetic energy is energy of motion. There are two types of potential energy: gravitational potential energy, which depends on an object's mass and height, and elastic potential energy, which depends on the stretching or compressing of an object. Kinetic energy depends on an object's mass and velocity and represents the energy of motion. Potential energy is converted to kinetic energy when a stored energy begins to move or change form.
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KE Energy and PE Energy Powerpoint no equations manipulated.pptx
- 2. Learning Objectives I can define Kinetic and Potential energy. I can identify Kinetic and Potential energy. I can give examples of the two forms of energy. I can explain how one can transfer to the other.
- 3. Work The product of distance and the force in the direction an object moves. Work = Force x Distance
- 4. Definition of Energy The ability or capacity to do work. Measured by the capability of doing work: potential energy or the conversion of this capability to motion: kinetic energy.
- 5. What is Energy? The ability to cause change Its what causes change in everything! Nothing changes without some energy causing it. Earthquakes, Rain, even human growth is all because of energy.
- 6. Kinetic and Potential Energy 2 types of energy
- 7. How is all energy divided? Potential Energy Kinetic Energy All Energy Gravitation Potential Energy Elastic Potential Energy
- 8. Potential Energy Energy that is stored due to position or shape. It is stored energy. There are 2 types of Potential Energy 1) Gravitational Potential Energy (GPE) 2) Elastic Potential Energy
- 9. Gravitational Potential Energy (GPE) Potential Energy that depends upon an objects height above a reference point Formula: PE = mgh Potential energy is calculated by: The objects mass (m), multiplied by the earths gravitational pull (g) (9.8 m/sec/sec), multiplied by the height (h) the object can fall.
- 10. Formula Representation Formula Represents Units PE = mgh m = Kilogram (kg) g = acceleration due to gravity m/s/s h = height Meter (m) mass
- 11. Gravitational Potential Energy Books on a shelf have Gravitational Potential Energy. Which books have the most Gravitational Potential Energy? Why?
- 12. Gravitational Potential Energy A man and his cell phone are on a ledge outside a very tall building. Which object (the man or his cell phone) has the most Gravitational Potential Energy? Why?
- 13. What does Potential Energy depend on and how does it affect potential energy? Height The higher the object, the more potential energy. Mass The greater the mass of the object, the more potential energy it has. Potential energy depends on both mass and height.
- 14. Examples of Gravitational Potential Energy Water at the top of a waterfall.. -Stores energy YoYo in held in your hand.. -Stores energy because of position
- 15. Elastic Potential Energy (EPE) The potential energy of an object that is stretched or compressed. Examples of Elastic Potential Energy Stretching a rubber band.. -Stores energy Drawing a Bow -Stores energy because of position
- 16. Elastic Potential Energy The bow has energy because work has been done to change its shape. The energy of that work is turned into potential energy. When the arrow is released the potential energy of the bow and string will be transferred to the arrow, sending it flying through the air.
- 17. Elastic Potential Energy Compressed, or squished, springs also have potential energy. A spring has energy because work has been done to change its shape. Just like the bow, the energy of that work is turned into potential energy.
- 18. Elastic Potential Energy What about rubber bands and other things that stretch? Elastic Potential Energy
- 19. There are two types of Potential energy: Potential: stored energy (able or about to do something but isnt just yet) The bow can shoot the arrow but isnt right now. The boulder can fall but it hasnt yet Elastic Energy is caused by changing the shape of an object (stretching, bending, pulling, squishing) Elastic Gravitational Gravitational Energy is caused by the force of gravity Pulling down on an object while the object is being held up! The ball could fall, but it hasnt yet! There are two basic examples of Potential Energy:
- 20. When the position of an object is altered it, creates Potential Energy. A yo-yo on the table, doesnt have energy, but when picked up, it alters its position and now it has the ability (or potential) to do work. A bow doesnt have the capacity to do work, unless its held at an elevated position.
- 21. Potential Energy Converted to Kinetic Energy When stored energy begins to move, the object now transfers from potential energy into kinetic energy. Standing still Running
- 22. Kinetic Energy Preview Kinetic Energy is the energy of motion or energy in use Any matter in motion has Kinetic Energy There are many forms of Kinetic Energy Some forms include: electromagnetic (light - radiant), thermal (heat), electrical, and mechanical (sound acoustic)
- 23. Kinetic Energy Definition and Formula The energy an object has due to its motion Formula: KE = 1 2 mv2 Kinetic energy is calculated by: Squaring the velocity (v), multiply by the objects mass (m), than divided by 2.
- 24. Formula Representation Formula Represents Units KE = 1 2 mv2 KE = Joules (J) m = mass kilogram (kg) v = velocity Meter/second (m/s) Kinetic Energy
- 25. Kinetic energy: Kinetic: Energy of movement Ball falling down = Movement Movement = Kinetic Energy Gravity pulls the liquid down through the hole! This container is full of a red liquid But there is a hole! The motion of the liquid is an example of a substance with Kinetic Energy
- 26. What is the unit for Kinetic and Potential Energy? Unit: Joule Named after: James Prescott Joule He discovered the relationship between heat (energy) and mechanical work which led to the law of conservation of energy. How do we derive this unit? 1 Joule = 1kg m2/s2 KE = 遜 m(kg) v(m/s) 2 PE = m(kg) g(m/s) 2 height(m)
- 27. What does Kinetic Energy depend on and how does it affect kinetic energy? Velocity/Speed The faster the object moves, the more kinetic energy it has. Mass The greater the mass of a moving object, the more kinetic energy it has. Kinetic energy depends on both mass and velocity.
- 28. Which affects kinetic energy more? Mass or Velocity and why? Velocity has more of an affect on kinetic energy because the velocity is squared.
- 29. Examples of Kinetic Energy Shooting a rubber band. Water falling over the fall. A Yo-Yo in motion. Releasing the arrow from the bow.
- 30. Potential vs. Kinetic: The Roller Coaster has potential energy at the top of the hill But it has Kinetic energy when it rolls down the hill! The rocket has potential energy when the fuel hasnt been lit The rocket has Kinetic energy when its fuel is lit and it flies through the air Wow! Theres a lot of potential energy in this sucker!
- 31. Summary of What Youve Learned.. Example using a coin: Holding a coin in you hand, alters the coins original position. The coin has potential energy, because it has ability to do work. Dropping the coin in the bank, changes the stored energy into motion. This transfers the coins energy from potential to kinetic energy.
- 32. Big Ideas 2 main types of energy: Kinetic and Potential Kinetic energy is energy of motion and depends on mass and velocity. Potential energy is stored energy Potential energy has 2 types: Gravitational and Elastic Gravitational potential energy depends on mass and height.