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Mechanical Energy Monuments Review

Mechanical Energy Monuments Review. So you can commit it to M.E.M.Re. Lets start with work. What is work? The transfer of energy by mechanical means; is done when a constant force is exerted on an object in the direction of motion. Work 2. What does that mean?

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Mechanical Energy Monuments Review

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  1. Mechanical Energy Monuments Review So you can commit it to M.E.M.Re

  2. Lets start with work • What is work? • The transfer of energy by mechanical means; is done when a constant force is exerted on an object in the direction of motion.

  3. Work 2 • What does that mean? • My version: Work is the energy we use/get on/from an object moving because a force (push pull) was applied. • I move an object I am doing work.

  4. Picture time • Draw a picture:

  5. Work 3 • What is the equation for work? • W = Fd (cosΘ) • What does that cos mean? • We can have positive, negative, and 0 work.

  6. Work 4 • Positive: When the force and the direction are pointed in the same direction • Negative: When the force and the direction are pointed in opposite directions • Zero: When the force and the direction are perpendicular.

  7. Work video • http://youtu.be/_N0r1ignq1w

  8. Kinetic energy • What is Kinetic energy? • Kinetic means ‘to move’ so it is energy from motion.

  9. Picture time • Draw a picture:

  10. Equation • What is the equation for KE? • KE= ½ mv2 • Don’t forget the squared velocity!

  11. KE video • http://youtu.be/2MkAZu6QW0I

  12. Potential energy • What is potential energy? • It is energy stored, in this class we are dealing with potential energy gravitation. So the stored energy is based on how high up is the object.

  13. Picture time • Draw a picture:

  14. Equation • What is the equation for PE? • PE = mgh

  15. PE video • http://youtu.be/pNl8flwGWD8

  16. Mechanical energy • What is Mechanical energy? • Energy of an object due to its motion or position.

  17. ME 2 • What does that mean? • Mechanical energy is if a physical object is moving or can move.

  18. Picture time • Draw a picture:

  19. Equation • What is the equation for Mechanical energy. • MEi=MEf • What I start with is what I will end with.

  20. Concept question • A man rides an elevator to the 3rd floor of his building. (12 m high), his identical twin takes the stairs. If the stairs go around the entire building who has more Energy when they reach the room?

  21. Boxy (5kg of mass) falls from 2m up, how fast is boxy moving just before he hits the ground?

  22. You try. • A roller coaster cart (100kg) is traveling at 40m/s at the bottom of the track. How high will the cart climb up the track?

  23. Pendulum • A mass of 3kg is held 0.5m above the ground. If released from rest how much Kinetic energy will the mass have at the bottom of the swing?

  24. Pendulum 2 • How much KE will it have at 0.25m above the ground?

  25. Hill • A man on top of a hill 7m tall slides down to the bottom. If the man has a mass of 90kg and we ignore friction how fast is the man traveling ½ way down the hill?

  26. Hill 2 • What is the KE of the man at the bottom of the hill.

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