2015-02-12 Freshman Science Physics Activity 2

We discuss Newton's Second Law and how to interpret in words and symbols (numbers).

Physical SciencePhysics
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2015-02-12 Freshman Science Physics Activity 2

Created 3 years ago

Duration 0:24:21
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We discuss Newton's Second Law and how to interpret in words and symbols (numbers).
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  1. Coordinated ScienceChapter 1 Activity 2

    Slide 1 - Coordinated ScienceChapter 1 Activity 2

    • Mr. Weisenfeld
  2. Date:  Thu., Feb. 12, 2015

    Slide 3 - Date: Thu., Feb. 12, 2015

    • Objective: Our goal today is to get comfortable using Newton’s 2nd Law (N2L).
    • We will know we have learned this when we can use (force = mass times acceleration) correctly with both words and numbers.
  3. Aaaa

    Slide 4 - Aaaa

  4. Entry Task:   Choose one of the following statements in your notebook, write it out and complete it based on your experiences in the lab:

    Slide 5 - Entry Task: Choose one of the following statements in your notebook, write it out and complete it based on your experiences in the lab:

    • “The greater the constant, unbalanced force pulling on an object, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.”
    • “When equal amounts of constant, unbalanced force are used to pull objects having different masses, the more massive object, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.”
  5. Quiz Question Here

    Slide 6 - Quiz Question Here

  6. Make sure you have this definition (the bold words below) in your glossary.

    Slide 7 - Make sure you have this definition (the bold words below) in your glossary.

  7. Let’s look at the definition in pieces.

    Slide 9 - Let’s look at the definition in pieces.

    • “The acceleration of an object”
    • Means an object is speeding up
    • The units are meters per second per second
    • If Speed is meters per second (like miles per hour, or feet per second)
    • Then Acceleration is (meters per second) per second
    • An object that is getting faster has more (meters per second) every second.
  8. In the following simulation

    Slide 11 - In the following simulation

    • Click on Acceleration to get started
    • 2. Check to show speed and acceleration of the box.
    • 3. Click on the black arrows to apply a force to the box.
  9. You should have seen (go back if you have to):

    Slide 13 - You should have seen (go back if you have to):

    • Unless the force applied is greater than friction, the box won’t move.
    • If the force is greater than friction, the box will have an acceleration.
    • If the box has an acceleration, then the speed is increasing.
    • If you stop pushing, the box will slow down and stop due to friction.
    • If you start pushing against the motion, it will slow down quicker.
    • If you turn off friction, a small force will get the box moving, faster and faster and faster…
    • If you give a small push and then stop, the box will move at a constant velocity when there is no friction.
  10. Next piece of the definition.

    Slide 14 - Next piece of the definition.

    • “The acceleration of an object is directly proportional to the unbalanced force acting on it”
    • Means that if you don’t have an unbalanced (or net) force, nothing is going to move.
    • Means that the harder you push the greater the acceleration.
    • * Go back to the simulation and try it right now if you don’t believe me…
  11. Next piece of the definition.

    Slide 16 - Next piece of the definition.

    • “The acceleration of an object is directly proportional to the unbalanced force acting on it and inversely proportional to the objects mass.”
    • Now keep the force constant and change the mass.
    • Inversely proportional means that if you double the mass the acceleration goes down by 1/2, for the same force.
    • * Go back to the simulation and try pushing on two boxes, instead of just one…
  12. The last piece of the definition.

    Slide 18 - The last piece of the definition.

    • “…The direction of the acceleration is the same as the direction of the unbalanced force.”
    • In pictures, this box has a net force (greater force, unbalanced force) to the right, and so it is accelerating to the right.
  13. That was N2L in words now how about symbols?

    Slide 20 - That was N2L in words now how about symbols?

    • If you are given any two of , , or , you can find the third.
  14. Let’s do a problem from the book,   pg 25, problem #1

    Slide 21 - Let’s do a problem from the book, pg 25, problem #1

  15. Sprinter

    Slide 22 - Sprinter

  16. Long Jumper

    Slide 23 - Long Jumper

  17. Shot put ball

    Slide 24 - Shot put ball

  18. Ski jumper

    Slide 25 - Ski jumper

  19. Hockey player

    Slide 26 - Hockey player

  20. Running back

    Slide 27 - Running back

  21. Thanks for listening!

    Slide 28 - Thanks for listening!