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1 Name Period Score / 74 Physics Core Curriculum Review Gravitational and Electrical forces (2 pts per word) = 14 points + 60 in worksheets Vocabulary Word Definition in words you understand Give examples or Draw a picture Electrical Force Electrical charge Coulomb s Law Mass Weight Gravitational Force Newton s Law of Gravitation / 26 points Coulombs Law Practice Worksheet 1. Write the formula Coulombs Law of Electrical Force and explain what the letters mean. (4 points) 2. Opposite charges and like charges 3. If the Pith ball below has a static charge of -3, which way will it move if it hangs freely, but the charged rods next to it cannot move? Explain why Which way would the ball move if it has a charge of + 2? Explain why

2 4. You determine that the force between two static charges is + 4 N. Is the force repulsive or attractive? Explain why 5. If the distance between the pith ball and the post is 2 times farther apart, what happens to the force between them? Explain why. +3 charge on ball If the distance between the pith ball and the post is 3 times farther apart, what happens to the force between the? Explain why 7. Look at the picture below. +3 charge on ball distance between = 4 units -1 If the distance between the charges decreases to 2 units, how many times closer is this? What happens to the total electrical force between the ball and the post? If the distance goes down to 1 unit apart? How many times closer is this? What happens to the total Electrical force between the ball and the post? 8. Look at the picture above. Will the ball be attracted or repelled from the charged rod? Explain why. If the charge on the rod changed from -1 to + 2, (so 2 times the charge) how would have affect total electrical force between the ball and the rod? Explain why. If the charge on the rod changed to + 2, how would that affect the movement of the pith ball? Explain why.

3 / 20 points Universal Gravitation Practice Worksheet 1. Write the formula Newton s Law of Universal gravitation and explain what the letters mean. (4 points) 2. Explain how the changing the mass affects the gravitational force. 3. Explain how changing the distance between masses affects the gravitational force. Use the diagram below for questions 4-5 : 50 kg 200 Kg D = 4 units 4. If the mass on the left goes up to 100 Kg (the distance stays the same) How many times more mass is this? How will the gravitational force between the two masses be affected? 5. What if the mass goes on the left goes up to 200 Kg (the distance stays the same). How many times more mass it this? How will the gravitational force between the two masses be affect?

4 Use the diagram below for questions 6-10 : 50 kg 200 Kg D = 4 units 6. In the diagram above: If the distance between the 2 masses decreases from 4 units to 2 units, How many times less distance is this? How will the gravitational force between the 2 masses be affected? 7. In the diagram above: If the distance between the 2 masses decreases from 4 units to 1 unit, How many times closer is this? How will the gravitational force between the 2 masses be affected? 9. In the diagram above: If the distance between the 2 masses increases from 4 units to 8 units, How many times more distance is this? How will the gravitational force between the 2 masses be affected? 10. In the diagram above: If the distance between the 2 masses increases from 4 units to 12 units, How many times more distance is this? How will the gravitational force between the 2 masses be affected? / 14 Additional Practice Core Questions 1. If an astronaut took a rocket ship to Mars what would change? (1pt) A. Width of the astronaut. B. Height of the astronaut. C. Mass of the astronaut. D. Weight of the astronaut.

5 2. Can Newton s law of universal gravitation be used to calculate your weight on Jupiter (if you could actually stand on the surface)? (1pt) A. Yes the value of gravity is the same everywhere B. Yes the natural laws operate the same everywhere C. No the value of gravity changes from place to place. D. No natural laws operate differently in different places. 3. Newton s law of universal gravitation states that F = G m1 m2 d 2 What is the effect on the gravitational force is m1 is doubled? (1pt) A. The force is doubled because force and mass are directly proportional. B. The force is halved because force and mass are directly proportional. C. The force is 4 times greater because force and mass are inversely proportional. D. The force is ¼ because force and mass are inversely proportional. 4. According to Newton's law of universal gravitation, what will have a greater affect on the gravitational force? (1pt) A. An increase in m1 C. A decrease in m2 B. An increase in d D. A decrease in G 5. During an experiment, you notice that as you increase the mass on a spring scale (used to measure weight) that the reading on the scale also increases. Which statement best describes the relationship between the variables in this experiment? (1pt) A. Weight directly influences the amount of mass B. Mass has little influence on weight C. As mass increases, weight will increase D. Weight and mass are identical 6. Tides are the result of gravitational forces between the moon and the water on the earth. The sun also has an effect on the tides but its influence is less than half that of the moon even though the sun has so much more mass than the moon. Where does this knowledge come from? (1pt) A. Observations by astronomers and physicists give the evidence that geologists use. B. Observations by astronomers and physicists give the evidence, but geologists would not know this. C. Each science area must study this for themselves. D. Physics is the only science that studies such phenomena. 7. Newton s law of universal gravitation states that F = G m1 m2 d 2 What is the effect on the gravitational force is d is halved? (1pt) A. The force is doubled because force and distance are directly proportional. B. The force is halved because force and distance are directly proportional. C. The force is 4 times greater because force and distance are inversely proportional. D. The force is ¼ because force and distance are inversely proportional.

6 8. In a professional automobile paint shop, an electric charge is created on the surface of the automobile, and an electric charge is created on the tiny paint particles that are to be applied. This will help create a better paint job on the automobile. Using what you understand about electric charges, which of the following best explains why this would be done? (1pt) A. The two electric charges are the same so the paint will be attracted to the car B. The two electric charges are different so the paint will be attracted to the car C. The two electric charges are the same so the paint will be repelled from the car D. The two electric charges are different so the paint will be repelled from the car (2pts) A. Will the 2 objects above attract or repel? (1pt) B. What will happen to the charge between the 2 objects when they touch? (1pt) USE THE FOLLOWING PICTURE FOR THE NEXT 4 QUESTIONS Two electrical charges are shown in the diagram. 10. How would the strength of the electrostatic force change if Q1 were doubled? (1pt) D. The electrical force would be ¼ as strong 11. How would the strength of the electrostatic force change if d were doubled? (1pt) D. The electrical force would be ¼ as strong 12. How would the strength of the electrostatic force change if Q1 were half as much? (1pt) D. The electrical force would be ¼ as strong 13. How would the strength of the electrostatic force change if d were cut in half? (1pt) D. The electrical force would be ¼ as stronger

Name Date Block Review for Test on Universal Gravitation and Electrostatics Test is on:

Name Date Block Review for Test on Universal Gravitation and Electrostatics Test is on: Please bring a completed (in your own handwriting) and corrected packet to the test. You will be able to use it on