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Motion and Energy

Motion and Energy. Motion is in the eye of the beholder. We sometimes call this RELATIVE motion. We have to see something move in relation to something else – we need a FRAME OF REFERENCE. UNBALANCED forces create motion. It’s like a tug-o-war

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Motion and Energy

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  1. Motion and Energy

  2. Motion is in the eye of the beholder • We sometimes call this RELATIVE motion. • We have to see something move in relation to something else – we need a FRAME OF REFERENCE

  3. UNBALANCED forces create motion • It’s like a tug-o-war • When both sides are evenly matched, neither one wins, and there is no mevement

  4. UNBALANCED forces create motion • If one side starts to overcome the other, the center of the rope moves toward the stronger side • We have created motion with unbalanced force

  5. Isaac Newton described motion in 3 brilliant “laws” • Objects that are in motion will stay in motion • Objects at rest will stay at rest • Unless a force acts on them Law #1

  6. Isaac Newton described motion in 3 brilliant “laws” • For Every Action, there is an equal and opposite reaction • “You push on the floor as hard as the floor pushes back on you.” Law #2

  7. Isaac Newton described motion in 3 brilliant “laws” • Force = Mass x acceleration • The bigger you are, the harder you hit • The faster you run, the harder you hit Law #3

  8. Speaking of Acceleration… • Acceleration is an increase or decrease in speed. • Sometimes we say that acceleration is a change in speed.

  9. So what is Speed? • No, it’s not Lightning McQueen • Speed is how far you went divided by how look it took to get there • Speed = distance/time

  10. So what does speedhave to do with energy and gravity and all that stuff we’ve been learning? • Gravity accelerates things toward the center of the earth

  11. Gravity accelerates things toward the center of the earth • The higher above the ground something is, the longer it has to fall, and the faster it will be going when it hits the ground.

  12. Gravityaccelerates things toward the center of the earth • When something is way up high, it has the POTENTIAL to fall a long distance, and get going really fast, so we say it has POTENTIAL ENERGY

  13. Gravityaccelerates things toward the center of the earth • When something finally does fall off, we say that it has KINETIC ENERGY, or the energy of MOTION.

  14. Now we’ve come full circle to MOTION again • Remember those unbalanced forces? • When the force of friction slowing down a skiier is not equal to the force of gravity accelerating him, motion happens!

  15. What was that about friction? • Friction always acts in the direction opposite of motion. • When there is little friction, funny things happen 

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