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Warm-Up: November 7, 2011

Warm-Up: November 7, 2011. A 725 kg car is driving around a circle with a radius of 60.0 m at 35.0 m/s. What is the acceleration of the car? What force must the road exert on the tires to produce this acceleration?. Homework Questions?. Forces Project. Due November 18.

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Warm-Up: November 7, 2011

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  1. Warm-Up: November 7, 2011 A 725 kg car is driving around a circle with a radius of 60.0 m at 35.0 m/s. What is the acceleration of the car? What force must the road exert on the tires to produce this acceleration?
  2. Homework Questions?
  3. Forces Project Due November 18

  4. Universal Law of Gravitation

    Chapter 7
  5. Gravity There is a force of gravity between every pair of objects with any mass (large or small) The force of gravity is larger for larger masses. The force of gravity decreases with increasing distance between the objects. The force of gravity is inversely proportional to the square of the distance
  6. Law of Universal Gravitation G = Universal gravitational constant r = Distance between the centers of the objects
  7. G, The Universal Gravitational Constant This value is on your CST Reference Sheet (you don’t have to memorize) This value is the same everywhere
  8. How is G related to g? G = 6.67x10-11 N m2/kg2 Radius of Earth = 6.38x106 m Mass of Earth = 5.97x1024 kg
  9. Example 1 Two people, one 51 kg and the other 64 kg, are standing 1.0 m away from each other. What is the force of gravity between them?
  10. You-Try #1 Two people, one 51 kg and the other 64 kg, are standing 3.0 m away from each other. What is the force of gravity between them?
  11. r-squared If you double the distance between two objects, the force of gravity is divided by 4 If you triple the distance between two objects, the force of gravity is divided by 9 If you cut the distance between two objects in half, the force of gravity is multiplied by 4 If you reduce the distance between two objects to 1/3 of the previous distance, the force of gravity is multiplied by 9
  12. Example 2 Using the following data, calculate the force of gravity between Earth and its moon.
  13. You-Try #2 Using the following data, calculate the force of gravity between Earth and the Sun.
  14. A little review Uniform circular motion is at constant speed Centripetal force and centripetal acceleration towards the center of the circle Acceleration is perpendicular to direction of travel For an object in a circular orbit, the force of gravity is the centripetal force, which is also the net force
  15. Formula Review
  16. Worksheet You may work in groups of no more than 4, as long as you are all working on each problem together NO SPLITTING UP WORK If you finish the “Planet Z” worksheet, show it to Mr. Szwast and get a “How fast are we moving?” worksheet
  17. Warm-Up: November 9, 2011 The force of gravity between two objects when they are 10 meters apart is 8.0x10-6 N. What is the force of gravity between the same two objects when they are 20 meters apart? If you don’t know how to solve this problem, look back in last week’s notes for the section titled “r-squared”
  18. Warm-Up: November 9, 2011 The force of gravity between two objects when they are 10 meters apart is 8.0x10-6 N. What is the force of gravity between the same two objects when they are 5 meters apart? If you don’t know how to solve this problem, look back in last week’s notes for the section titled “r-squared”
  19. Quizzes and Test Next Week Unit 1 Test on Friday, November 18 Will include EVERYTHING from the semester We will review next week Monday, Tuesday, and Wednesday Reminder: Project due November 18 Calculator quiz on Monday Units quiz on Tuesday
  20. Worksheet: How Fast Are We Moving? You may work in groups of no more than 4, as long as you are all working on each problem together NO SPLITTING UP WORK Due Thursday at the beginning of class
  21. Warm-Up: November 10, 2011 A 12 kg box is pushed from rest with a constant force of 45 N. Assume static friction is overcome and the box accelerates. The coefficient of kinetic friction between the box and floor is 0.35. Draw a free body diagram. What is the weight of the box? What is the force of friction on the box? What is the acceleration of the box? How far does the box move in 3.00 seconds?
  22. Agenda Finish “Planet Z” worksheet Finish “How Fast Are We Moving?” worksheet Work on forces unit project May use netbook computers if you have turned in your netbook agreement form to Mr. Szwast Both worksheets due Monday Project due Friday
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