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Do now

Do now. What is the formula for speed? What is the formula for velocity? What is the formula for acceleration? If Armon is traveling in his car at 25 m/s and speeds up to a rate of 35 m/s in 5 seconds, what is his acceleration?. Announcements. Happy Friday! Notebook Check today

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Do now

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  1. Do now What is the formula for speed? What is the formula for velocity? What is the formula for acceleration? If Armon is traveling in his car at 25 m/s and speeds up to a rate of 35 m/s in 5 seconds, what is his acceleration?

  2. Announcements • Happy Friday! • Notebook Check today • Test on Monday covering acceleration, speed and velocity. • We will have more lab activities on Thursday and Friday.

  3. Agenda for Today • Independent Practice Sheet—30 minutes. Once the timer goes off, you will have no additional time to complete it, so STAY ON TASK and DO NOT GET OUT OF YOUR SEAT. • Review for Test • Forces and Motion Guided Notes

  4. Discussion: • Why do you think a penguin slides/rolls further than a bear?

  5. Newton’s Laws • Newton’s Laws are all about force and motion. • Force is a push or pull

  6. Types of force • Contact force: when on object pushes/pulls another object • Gravity: Force of attraction between two masses. • Friction: Force that resists motion between two surfaces.

  7. Balanced and unbalanced forces • Overall force acting on an object when forces are combined is the net force. • If the net force on an object is zero, the forces acting on the object are balanced. • Unbalanced force can change the motion of an object.

  8. Checking for Understanding • What is force? • What is an unbalanced force?

  9. Sir Isaac Newton • Born on December 25th, 1642 and died March 20th, 1727. • Considered to be one (if not the) greatest and most influential scientist who ever lived.

  10. What’s so great about him? • Wrote a book about classical mechanics. • Described universal gravitation • Three laws of motion.

  11. Why’s he important to us as 7th graders? • We are studying motion currently and are beginning to learn about his three laws.

  12. Newton’s 1st Law • Newton’s 1st Law: An object at rest will remain at rest and an object in motion will remain in motion unless an unbalanced force acts upon it.

  13. Newton’s 1st Law • Anytime you read about a situation where something is at rest and then it starts moving or is moving and then it stops, it is talking about Newton’s 1st Law.

  14. Newton’s 1st Law • There is a box that is sitting on the floor at rest. It will remain at rest until somebody pushes it. At rest… In motion…

  15. Checking for Understanding • What does Newton’s first law state?

  16. Newton’s 1st Law • You are driving in a car with no seat belt on. You see a family of ducks and slam on your brakes to avoid hitting them. Since you are not wearing your seat belt, you fly out of the car (remain in motion) until you hit the ground (an unbalanced force). AHH! Ouch In motion… At rest…

  17. Inertia (ih-NER-shuh) • Inertia is the resistance of an object to a change in the speed or direction of its motion. • How does this apply to Newton’s 1st law? • The first law describes the tendency of objects to resist changes in motion. • AKA they’re one in the same.

  18. Graphic organizer • I’m passing out a graphic organizer that YOU MUST NOT LOSE! Attach it in your science notebook. • We’ll be using this for all of Newton’s three laws. • When you get the organizer, go ahead and write in what Newton’s first law states.

  19. Exit Ticket • Shelly was walking through the mall at .5 m/s when she noticed Mrs. Ward walking through the food court with her family. She increased her speed to 1 m/s in 1 second to catch up to say hello. What was Shelly’s acceleration?

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