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Improvements. Have students identify lots more force pairs & do more problems These last 3 sections…this hole chapter…is pretty disjointed  Use physics classroom online more!. Bell Work 5/8/13. Turn in lab if you’re done! (+1)

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improvements
Improvements
  • Have students identify lots more force pairs & do more problems
  • These last 3 sections…this hole chapter…is pretty disjointed 
  • Use physics classroom online more!
bell work 5 8 13
Bell Work 5/8/13

Turn in lab if you’re done! (+1)

  • Alyssa pushes a 5.0 kg ball with a force of 22.5 N. What will the ball’s acceleration be?
slide4

Today you are going to…take notes on Newton’s 3rd Law of Motion.

So you can…further understand forces & motion

You’ll know you’ve got it when you can

  • State Newton’s 3rd Law
  • Identify force pairs
  • Give motion & no motion examples
  • Why don’t both objects always accelerate?
  • Why don’t both objects have the same acceleration?
  • Calculate accelerations.
newton s 3 rd law
Newton’s 3rd Law
  • For every action force, there is an equal and opposite reaction force.

OR

  • Forces occur in equal and opposite pairs.
newton s 3 rd law1
Newton’s 3rd Law
  • My hand pushes up on the eraser.
  • The eraser pushes down on my hand.
  • If the force on the eraser is 5 Newtons upward, what is the other force?
newton s 3 rd law2
Newton’s 3rd Law
  • Identify force pairs
newton s 3 rd law3
Newton’s 3rd Law
  • Cat-a-pult sitting on desk
  • Shuster pushing on wall
  • Hand pushing game!
  • Cat-a-pult launching golf ball
  • Which happens first?
newton s 3 rd law4
Newton’s 3rd Law
  • It can make stuff move!!
newton s 3 rd law5
Newton’s 3rd Law
  • Sarah pushes to the righton the wall.
  • The wall pushes to the left on Sarah.
  • If Sarah pushes to the right with 110 N of force, what is the magnitude and direction of the other force?
  • If Sarah is on roller skates and has a mass of 55 kg, what will her acceleration be?
  • What will the wall’s acceleration be? Why?
newton s 3 rd law6
Newton’s 3rd Law
  • Sarah pushes to the righton the wall.
  • The wall pushes to the left on Sarah.
  • If Sarah pushes to the right with 110 N of force, what is the magnitude and direction of the other force?
  • If Sarah is on roller skates and has a mass of 55 kg, what will her acceleration be?
  • What will the wall’s acceleration be? Why?
newton s 3 rd law7
Newton’s 3rd Law
  • In an action/reaction pair, why does one object sometimes accelerate while the other doesn’t?
flyboard video
Flyboard Video
  • Flyboard
    • What are the action/reaction forces?
  • http://www.youtube.com/watch?NR=1&v=m4Bm3cs9TFo&feature=endscreen
newton s 3 rd law8
Newton’s 3rd Law
  • If they’re equal and opposite forces, why don’t action/reaction forces cancel out???
slide24

Big Jim & Tiny Tina are ice skating close together. Big Jim says something Tiny Tina finds insulting. She pushes him with a force of 80.0 N. Calculate their acceleration.

newton s 3 rd law on ice
Newton’s 3rd Law on Ice
  • If Big Jim & Tiny Tina are ice skating. They push off from one another. Describe their acceleration.
    • They both experience the same force.
    • Tiny Tina accelerates more because she has less mass (inertia).
bell work 4 22 13
Bell Work 4/22/13
  • State Newton’s 3rd law. (c.s.)
  • Vinny kicks a board. Identify the pair of forces.
  • Why don’t action/reaction forces cancel out?
  • W5SAYWoS
schedule
Schedule
  • Thursday
    • Newton’s 3rd Law notes
  • Friday
    • Newton’s 3rd Law notes
  • Monday
    • Finish Newton’s 3rd Law notes
    • Newton’s 3rd Law questions (homework)
  • Tuesday
    • Review Newton’s 3rd Law questions
    • Begin Racecar Project
  • Wednesday
    • Build racecar
  • Thursday
    • Test racecars
  • Friday
    • Newton’s 3rd Law quiz
    • Work, power, & machines
slide29

Bill and Sarah are ice skating. Bill has a mass of 155 kg and Sarah has a mass of 65.0 kg. Sarah pushes off of Bill with a force of 88.0 Newtons. Calculate Bill’s acceleration AND Sarah’s acceleration.

In the above problem, Bill and Sarah started off standing still, so their initial velocity was 0 m/s. If Sarah pushed for 0.400 seconds, calculate her velocity & his velocity using the acceleration equation.

newton s 3 rd law9
Newton’s 3rd Law
  • Allison pushes downon the ground.
  • The ground pushes upon Allison.
  • If Allison pushes with 603.4 N of force, what is the magnitude and direction of the other force?
  • If Allison has a mass of 61 kg, what will her acceleration be?
  • What will the Earth’s acceleration be?

mass of Earth = 5.9742 × 1024 kilograms

slide31

If Allison pushes with 603.4 N of force, what is the magnitude and direction of the other force?

  • If Allison has a mass of 61 kg, what will her acceleration be?
  • What will the Earth’s acceleration be?

mass of Earth = 5.9742 × 1024 kilograms

chuck norris fact
Chuck Norris Fact
  • When Chuck Norris does a push up, he’s not pushing himself up. He’s pushing the Earth down.
newton s 3 rd law10
Newton’s 3rd Law
  • Why don’t both objects have the same acceleration?
video
Video!
  • Steve Spangler Newton’s 3rd Law Video 2:20 (propels himself using 3rd Law)
slide37

Shooting a gun

  • Astronaut pushes off of spacecraft
why don t both objects have the same acceleration
Why don’t both objects have the same acceleration?
  • Forces occur in equal and opposite pairs.
  • They don’t cancel out because the forces are acting on two different objects.
  • The result of the forces is not the same because:
    • The objects have different masses, so the same force results in different acceleration.
    • There are often other forces acting on the objects.
bell work
Bell Work
  • Sit in your seat & get your hw out.Schedule:
    • Collect HW
    • Review for tomorrow’s quiz
    • Launch cars
      • Distance to beat is 15.9 m