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5. The normal force always is in the opposite direction of the gravitational force. a. true b. false c. depend on the position of the object d. neither a or b is correct

5. The normal force always is in the opposite direction of the gravitational force. a. true b. false c. depend on the position of the object d. neither a or b is correct

Physics for Scientists and Engineers: Foundations and Connections
Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter7: Gravity
Section: Chapter Questions
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5. The normal force always is in the opposite direction of the gravitational force. Fnorm a. true b. false c. depend on the position of the object d. neither a or b is correct Farav 6. Which of the following cases does the free body diagram below illustrate? a. A book falling off a table. Fnorm b. A book sliding across the table at a constant speed. c. A book sliding across the table at a constant acceleration. grav d. A book at rest on a tabie 7. A body at rest tends to remain at rest and a body in motion tends to remain in motion unless acted upon by an unbalanced force is stated in the law of a. motion b. inertia d. action and reaction C. momentum 8. In a "coin and feather" jar, the feather falls at a slower rate than the coin because of a. inertia d. air resistance b. buoyant force c. momentum 9. An orange might roll off your cafeteria tray when you stop suddenly because of a. the balanced forces acting on the orange. the orange. b. the centripetal force acting on the orange. c. the friction forces acting on d. the orange's inertia. 10. In which of the following are action and reaction forces involved? a. when a tennis racket strikes a tennis ball b. when stepping from a curb c. when rowing a boat d. all of the above 11. What kind of friction occurs as a fish swims through water? a. fluid b. sliding c. rolling d. static 12. If you push on a railroad boxcar with a force of 200 N and it doesn't move, you can conclude that a. Newton's second law is not valid. b. This force is canceled by the third law force. c. The boxcar has too much mass to accelerate. d. There is a force of 200 N in the opposite direction 13. Since the forces demanded by Newton's third law of motion are equal in magnitude and opposite in direction, how can anything ever be accelerated? a. Newton's 3rd law only applies when there is NO acceleration. b. The forces in question act on different bodies. c. Newton's 2nd law is more important. d. Other changes create the acceleration 14. The sum of all forces acting on an object and direction a. Contact Force b. Unbalanced Force c. Balanced Force d. Net Force 15. Which of the following is an example of a contact force? a. A magnet picking up safety pins c. The moon orbiting Earth A toannd ball in follin tn the ennd
Transcribed Image Text:5. The normal force always is in the opposite direction of the gravitational force. Fnorm a. true b. false c. depend on the position of the object d. neither a or b is correct Farav 6. Which of the following cases does the free body diagram below illustrate? a. A book falling off a table. Fnorm b. A book sliding across the table at a constant speed. c. A book sliding across the table at a constant acceleration. grav d. A book at rest on a tabie 7. A body at rest tends to remain at rest and a body in motion tends to remain in motion unless acted upon by an unbalanced force is stated in the law of a. motion b. inertia d. action and reaction C. momentum 8. In a "coin and feather" jar, the feather falls at a slower rate than the coin because of a. inertia d. air resistance b. buoyant force c. momentum 9. An orange might roll off your cafeteria tray when you stop suddenly because of a. the balanced forces acting on the orange. the orange. b. the centripetal force acting on the orange. c. the friction forces acting on d. the orange's inertia. 10. In which of the following are action and reaction forces involved? a. when a tennis racket strikes a tennis ball b. when stepping from a curb c. when rowing a boat d. all of the above 11. What kind of friction occurs as a fish swims through water? a. fluid b. sliding c. rolling d. static 12. If you push on a railroad boxcar with a force of 200 N and it doesn't move, you can conclude that a. Newton's second law is not valid. b. This force is canceled by the third law force. c. The boxcar has too much mass to accelerate. d. There is a force of 200 N in the opposite direction 13. Since the forces demanded by Newton's third law of motion are equal in magnitude and opposite in direction, how can anything ever be accelerated? a. Newton's 3rd law only applies when there is NO acceleration. b. The forces in question act on different bodies. c. Newton's 2nd law is more important. d. Other changes create the acceleration 14. The sum of all forces acting on an object and direction a. Contact Force b. Unbalanced Force c. Balanced Force d. Net Force 15. Which of the following is an example of a contact force? a. A magnet picking up safety pins c. The moon orbiting Earth A toannd ball in follin tn the ennd
Post Test I. Multiple Choice: Choose the letter of the correct answer 1. A space probe is drifting to the right at n constant velocity in deep interstellar space far from any influence due to planets and atare-with its rockets off. If two rocket thrusters both turn on simultaneously exerting identical forces leftward and rightward in the directions shown, what would happen to the motion of the rocket? The space probe would continue with constant velocity. b. The space probe would speed up. c. The space probe would slow down and eventually stop d. The space probe would immediately stop. Space cable 2. An elevator is being pulled upward at a constant velocity by a cable as seen in the diagram. While the elevator is moving upward at constant velocity, how does the magnitude of the upward force exerted on the elevator by the cable elevator a. F. is greater than F b. Fe is equa o Fg c. F. is smaller than Fk d. F. could be larger or smaller than F. 3. A space probe is drifting to the right with constant velocity in deep interstellar space-far from any influence due to planets and stars. If a rocket thruster turns on and then off for a short burst of force in the direction Sabo Picbe Soace shown, what would best represent the path travelled by the rocket after the thrasher turns off? a. Path a b. Path b c. Path e d. Path d 4. Which of the following cases does the free body diagram below ilhustrate? a. A book falling off a table. b. A skydiver falling through the sky. c. A soccer ball after it has been hit straight up into the air. d. A leaf floating to the ground. Fgrav
Transcribed Image Text:Post Test I. Multiple Choice: Choose the letter of the correct answer 1. A space probe is drifting to the right at n constant velocity in deep interstellar space far from any influence due to planets and atare-with its rockets off. If two rocket thrusters both turn on simultaneously exerting identical forces leftward and rightward in the directions shown, what would happen to the motion of the rocket? The space probe would continue with constant velocity. b. The space probe would speed up. c. The space probe would slow down and eventually stop d. The space probe would immediately stop. Space cable 2. An elevator is being pulled upward at a constant velocity by a cable as seen in the diagram. While the elevator is moving upward at constant velocity, how does the magnitude of the upward force exerted on the elevator by the cable elevator a. F. is greater than F b. Fe is equa o Fg c. F. is smaller than Fk d. F. could be larger or smaller than F. 3. A space probe is drifting to the right with constant velocity in deep interstellar space-far from any influence due to planets and stars. If a rocket thruster turns on and then off for a short burst of force in the direction Sabo Picbe Soace shown, what would best represent the path travelled by the rocket after the thrasher turns off? a. Path a b. Path b c. Path e d. Path d 4. Which of the following cases does the free body diagram below ilhustrate? a. A book falling off a table. b. A skydiver falling through the sky. c. A soccer ball after it has been hit straight up into the air. d. A leaf floating to the ground. Fgrav
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