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Newton’s First Law of Motion 11/18/13 – 11/22/13

Newton’s First Law of Motion 11/18/13 – 11/22/13. 11/18 Weight vs Mass Textbook p 392-393 11/19 Newton’s 1 st Law of Motion Workbook p 65-68 11/20 Newton’s 1 st Law of Motion Workbook p. 69-72 11/21 Newton’s 1 st Law of Motion WB p. 73-76 11/22 Quiz.

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Newton’s First Law of Motion 11/18/13 – 11/22/13

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  1. Newton’s First Law of Motion11/18/13 – 11/22/13 11/18 Weight vs Mass Textbook p 392-393 11/19 Newton’s 1st Law of Motion Workbook p 65-68 11/20 Newton’s 1st Law of Motion Workbook p. 69-72 11/21 Newton’s 1st Law of Motion WB p. 73-76 11/22 Quiz

  2. Date: Objective: I can distinguish between mass and weight. I can also calculate weight in Newtons (N) Bell Ringer: • As the roller coaster travels from point A to B, how do its potential and kinetic energies change? • As the roller coaster travels from point D to E, how do its potential and kinetic energies change? A E B D C

  3. Date: Objective: I can distinguish between mass and weight. I can also calculate weight in Newtons (N) Activity Titled : Textbook p. 392 Answer Investigate Part A questions 1-5 in your Notebook Answer questions with your shoulder partner. Both partners must write their answers

  4. DEFINITIONS Mass- the amount of matter an object has. Matter- something that has mass and takes up space. Weight- is the amount of mass of an object, it is dependent upon gravity. 1 pound (lbs)= .45 kilogram (kg)

  5. Look at this figure. The mass of the bowling ball does not change, but the mass of the puppy does. How? Where does the matter come from? Can the mass of the bowling ball ever change?

  6. Tennis ball House fly Elephant Place these 5 items in the order they would be the most attracted to the Earth due to gravity. Explain why you picked your order. peanut Bowling ball

  7. Exit Question What would happen to your mass and to your weight if you went to the moon? Explain how you arrived at your answer. Singing on the moon https://www.youtube.com/watch?v=FMnzi8iFnG8 Lunar Olympics https://www.youtube.com/watch?v=16D0hmLt-S0

  8. Date: Objective: I can investigate Newton’s first law of motion Bell Ringer: • What would happen to your mass and to your weight if you went to the moon? Explain how you arrived at your answer. • Calculate the weight of a 50kg ball? Fw=mg

  9. Tennis ball House fly Elephant Place these 5 items in the order they would be the most attracted to the Earth due to gravity. Explain why you picked your order. peanut Bowling ball

  10. Activity Workbook page 65 Read demonstration as a group Complete workbook p.67 independently

  11. Activity Complete workbook p.68

  12. Date: Objective: I can understand Newton’s first law of motion and apply the concept to my daily life Bell Ringer: Based on our activity Yesterday, if the roller Coaster starts at point B What point will the cart Reach? D or E or F Explain why

  13. Read Workbook p 69-71 independently And take cornell notes 7 minutes

  14. 11/6/13 Newton’s 1st Law Video

  15. 11/15/12 Newton’s 1st Law Workbook page 72 complete TEJ

  16. m h1 h2 v Example of a conservative system: The simple pendulum. • Suppose we release a mass m from rest a distance h1 above its lowest possible point. • What is the maximum speed of the mass and where does this happen ? • To what height h2 does it rise on the other side ?

  17. Example: The simple pendulum. • What is the maximum speed of the mass and where does this happen ? E = K + U = constant and so K is maximum when U is a minimum. y y=h1 y=0

  18. Example: The simple pendulum. • What is the maximum speed of the mass and where does this happen ? E = K + U = constant and so K is maximum when U is a minimum E = mgh1at top E = mgh1 = ½ mv2 at bottom of the swing y y=h1 h1 y=0 v

  19. Example: The simple pendulum. To what height h2 does it rise on the other side? E = K + U = constant and so when U is maximum again (when K = 0) it will be at its highest point. E = mgh1 = mgh2 or h1 = h2 y y=h1=h2 y=0

  20. 1 3 2 h Potential Energy, Energy Transfer and Path • A ball of mass m, initially at rest, is released and follows three difference paths. All surfaces are frictionless • The ball is dropped • The ball slides down a straight incline • The ball slides down a curved incline After traveling a vertical distance h, how do the three speeds compare? (A) 1 > 2 > 3 (B) 3 > 2 > 1 (C) 3 = 2 = 1 (D) Can’t tell

  21. N T T m2 fk m1 m2g m1g An experiment Two blocks are connected on the table as shown. The table has a kinetic friction coefficient of mk. The masses start at rest and m1 falls a distance d. How fast is m2 going? Mass 1 S Fy = m1ay = T – m1g Mass 2 S Fx = m2ax = -T + fk= -T + mkN S Fy = 0 = N – m2g | ay | = | ay | = a =(mkm2 - m1) / (m1 + m2) 2ad = v2 =2(mkm2 - m1) g / (m1 + m2) DK= - mkm2gd – Td + Td + m1gd = ½ m1v2+ ½ m2v2 v2 =2(mkm2 - m1) g / (m1 + m2)

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