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Do Now

Do Now.

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Do Now

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  1. Do Now A student stands on a skateboard as the skateboard remains in place. When the student pushes his foot against the ground, the skateboard moves forward. The harder he pushes against the ground, the faster the skateboard moves. A friend jumps on for a ride, and the skateboard slows down. The student must push even harder to get the skateboard moving again. Once they get going, they hit a curb. The skateboard stops moving, but the students fly onto the grass. Fortunately, everyone is fine.– Describe three instances in the above paragraph where the skateboard was under the influence of unbalanced forces. For each instance, identify the primary forces involved, and explain why they were unbalanced.

  2. Announcements • Take home quiz • I’ll be gone Friday-Tuesday next week. • Class jobs while I am gone.

  3. Agenda • Professionalism • Introduce Newton’s Three Laws. • We’ve already learned one! • Café walk • Real life examples poster

  4. Professionalism • TIAA-CREF • Be aware of your body language • Walking through building

  5. Newton’s First Law • We’ve already learned this one, but in case you’ve forgotten… • Newton’s First Law: A scientific law stating that objects at rest remain at rest, and objects in motion remain in motion with the same velocity, unless acted on by an unbalanced force.

  6. What’s this look like? • Explain to me how this is an example of N1stL?

  7. Newton’s Second Law • Newton’s Second Law: A scientific law stating that the acceleration of an object increases with increased force and decreased with increased mass. • This can be stated mathematically! • Force = Mass x acceleration

  8. F = M x A Units of measurement • Mass = Kg • Acceleration = M/S2 • Force = Newtons • We can still use our speed triangle!!

  9. F = M x A Practice problem • Suppose that a sled is accelerating at 2 m/s2 and it weighs 50 kg. How much force must be applied to keep it moving?

  10. F = M x A Practice problem • Determine the accelerations that result when a 12-N net force is applied to a 3-kg object.

  11. What’s this look like? • Explain to me how this is an example of N2ndL?

  12. Newton’s Third Law • Newton’s Third Law: A scientific law stating that every time one object exerts a force on another object, the second object exerts a force that is equal in size and opposite in direction back on the first object. • Simply put, for every action there is an opposite and equal reaction.

  13. What’s this look like? • Explain to me how this is an example of N3rdL?

  14. Café Walk • I believe that you’ve done this before. • Around the room are posters with different pictures on them. • When I tell you to, you’ll take your marker and walk around the room. You’ll choose three pictures and you’ll explain on the paper what law they are representing and how you know that. • You have 10 minutes.

  15. Newton’s Law Poster • Illustrate an example of each of the three laws of motion. • Use one poster board or large piece of paper - 3 illustrations on one board or sheet of paper. • You may draw or use images from magazines. • Include an explanation of how the illustration demonstrates or describes the law of motion. Put the explanation next to the illustration. Do not use a separate sheet of paper for the explanation. • Make sure your illustrations are colorful and neat.

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