UNIT 1 - FORCE GRAVITATIONAL FORCE ACTIVITY LESSON DESCRIPTION SCORE/POINTS 1. NTS GRAVITATIONAL NOTE GUIDE /10 2. NTS EXAMPLES OF GRAVITY FORMULA /10

Transcription

1 NAME PERIOD UNIT - FORCE GRAVITATIONAL FORCE ACTIVITY LESSON DESCRIPTION SCORE/POINTS. NTS GRAVITATIONAL NOTE GUIDE /0. NTS EXAMPLES OF GRAVITY FORMULA /0 3. WS Universal gravitation worksheet /0 4. NTS ADDITIONAL NOTES /0 5. WS FREE FALL WORKSHEET /0 6. TX PP WORKSHEET FROM BOOK READING /4 OBJECTIVES: WHAT YOU NEED TO LEARN FROM THIS UNIT: Use Newton s Law of Universal Gravitation to explain the gravitation force between objects of different and objects at different distances. Explain the difference between and weight. Solve for weight when you know and acceleration due to gravity. Give examples of how Newton s Law of Universal Gravitation applies in your life. Solve problems using acceleration from gravity for speed and distance of a falling object

2 Write at least 5 study questions from the notes (5pts) GRAVITATIONAL FORCE NOTE GUIDE = the total amount of matter in an object = the pull of gravity on an object Gravitational Forces Act between two or more es Newton observed the planets orbiting the sun Newton s Universal Law of Gravitation: G = universal gravitational constant = 6.67 x 0 - So, the bigger the, the the gravity. It is directly proportional - which means: ( times more = times more gravity) Earth has 6 times more than the moon, so its gravity is times more. The farther apart, the the gravity It is inversely proportional which means: However, you are dividing by the distance squared d times farther apart = times closer together = 3 times farther apart = 3 times closer together = This is called an inverse square law. Universal Gravitation important when dealing with large objects or large distances.

3 EXAMPLES OF GRAVITY FORMULA Fill in from Class Discussion Change in Mass D= D = 4 4 D = D = 4 times more = times more = D = D = times farther apart = D = 3 3 times farther apart = D = D= times closer together =

4 CHECK YOUR UNDERSTANDING: Your Weight = (your ) (Earth s ) Distance to center of earth What if Earth got times more? (like if all iron atoms turned to lead) What would happen to your weight? What if you eat a lot of donuts and candy and you become twice as ive Would you weigh more or less up on top of a high mountain? Why? Suppose a girl on the Earth weighs 400 N. If she could climb ladder the same height as radius of earth. (so now she is times farther from the center) How much would she weigh? 400 N Newtons radius radii By the 800 s people had discovered the outer planets of Jupiter, Saturn, and Uranus. But the planets seemed to have some force acting on them. Mathematicians used Newton s formula and predicted the location another planet. Then astronomers looked and discovered The same process was used in the 930 s to discover

5 Universal Gravitation Practice Worksheet (0pts). Write the formula Newton s Law of Universal gravitation and explain what the letters mean. (4 points). Explain how the changing the affects the gravitational force. ( points) 3. Explain how changing the distance between es affects the gravitational force. ( points) Use the diagram below for questions 4-5 : 50 Kg 00 Kg D = 4 units 4. If the on the left goes up to 00 Kg (the distance stays the same) How many times more is this? How will the gravitational force between the two es be affected? ( points) 5. What if the goes on the left goes up to 00 Kg (the distance stays the same). How many times more it this? How will the gravitational force between the two es be affect? ( points)

6 Use the diagram below for questions 6-9 : 50 Kg 00 Kg D = 4 units 6. In the diagram above: If the distance between the es decreases from 4 units to units, How many times less distance is this? How will the gravitational force between the es be affected? ( points) 7. In the diagram above: If the distance between the es decreases from 4 units to unit, How many times closer is this? How will the gravitational force between the es be affected? ( points) 8. In the diagram above: If the distance between the es increases from 4 units to 8 units, How many times more distance is this? How will the gravitational force between the es be affected? ( points) 9. In the diagram above: If the distance between the es increases from 4 units to units, How many times more distance is this? How will the gravitational force between the es be affected? ( points)

7 Importance for understanding Newton s Law of Universal Gravitation. ADDITIONAL NOTES Write at least 5 study questions from the notes (5pts) Tides: Space Program: Satellites: Fill in Note guide Acceleration due to gravity Acceleration from gravity is (SI) or (English) That means that the speed of a falling object increases by about every second that it falls. So after seconds, an object is traveling After 8 seconds it is traveling about The distance an object falls can be determined by the formula A rock fall for 4.5 seconds before it hits the ground, how far did it fall?

8 FREE FALL WORKSHEET

9

10 . What are the two universal forces in nature? () WORKSHEET - PP in textbook. Why are they called universal? () 3. Gravitational forces act between two or more () 4. Who came up with the law of Universal Gravitation? () 5. What did he observe to help him come up with this law? () 6. Newton deduced that the force of gravity between planets decreases with the square of the distance between them. For example, a planet twice as far from the sun as the Earth would be pulled toward the sun with the force. A planet 3 times as far would be pulled with the force. () 7. This type of relationship described in question 5 is called what? () 8. State the Universal law of gravitation. () 9. Mathematically, the law can be written as what? () 0. Tell what each letter in the formula means. (3)