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Week #2 Notes

Week #2 Notes. Monday, October 17 th Reminder: Week #2 Vocabulary and notes are Due on Friday, October 21st. Newton’s Second Law. Fancy Definition : an object acted on by an unbalanced force will accelerate in the direction of the force Math Plug n Chug : Acceleration = Force / Mass

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Week #2 Notes

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  1. Week #2 Notes Monday, October 17th Reminder: Week #2 Vocabulary and notes are Due on Friday, October 21st

  2. Newton’s Second Law Fancy Definition: an object acted on by an unbalanced force will accelerate in the direction of the force Math Plug n Chug: Acceleration = Force / Mass Acceleration = m/s2 Force = Newtons Mass = kilograms

  3. Newton’s Second Law Easy Definition: If you apply a force, the object will move in the direction of the force Example: if you kick a ball forward….it will move forward.

  4. Draw it. Use it. Love it.

  5. Newton’s Second Law can tell you about changes in motion….using everyone’s favorite: math!  Question: If a 10N force acts on a 2kg object, what acceleration does it give the object? Step #1: Write the plug n chug (formula) Step #2: Write the formula again, but replace with the actual measurements Step #3: Chug out the answer

  6. Which 2 numbers can you plug in?

  7. a = F/m a = 10N / 2kg a = 5 m/s2 Question: If a 10N force acts on a 2kg object, what acceleration does it give the object?

  8. Friction There are 3 kinds: Rolling, static, and sliding

  9. Rolling Friction When a wheel rolls over a surface The force is in the direction of the way the wheel is rolling

  10. Would I be able to ride my bike on ice as good as on concrete? Bike wheel is moving forwardThe rolling friction is forward

  11. Static Friction The friction that keeps a stationary object from moving

  12. Static Friction keeps her food in place http://www.inmagine.com/tt062/tt0132042-photo Why is her food not moving around on her tray?

  13. Sliding Friction Happens when 2 surfaces slide past one another

  14. Why is this player not moving in a straight line at a constant speed?

  15. Acceleration Change in velocity divided by the amount of time required for the change to occur If the object changes speed, direction, or both  its accelerating Unit of measure: m/s2

  16. If you calculate acceleration and the answer is positive: the object is speeding up • If you calculate acceleration and the answer is negative: the object is slowing down Acceleration

  17. Acceleration = (final speed – start speed) time Calculate Acceleration

  18. When molecules collide with an object and slows its motion • Example: hand out the car window • Example: parachuting • Example: walking in hurricane winds • Air resistance is a type of friction • Will be opposite of the direction of the object • Air resistance increases with speed Air Resistance

  19. Weight & Mass They are not the same!

  20. Weight is the force of gravity on an object • On Earth, objects fall back to Earth with the same acceleration: 9.8 m/s2 Weight = mass x acceleration due to gravity For us its 9.8 m/s2 Weight

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