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Transcript

Name______________________________________ Date__________________ Friction: Study Guide 1. True or False: A wagon filled with rocks would have the same frictional force with the ground as an empty wagon. 2. Three students decided to go sledding in the park. Each of the students owned the same model of sled, but each of the students weighed different amounts, as shown in the charts below. Whose sled would have to overcome the most friction to move down the hill? Student A B C A. B. C. D. Weight 40 kg 60 kg 50 kg Student A Student B Student C There would be no difference. 3. True or False: If a basketball rolls off of smooth pavement onto unpaved bumpy ground, the frictional force between it and the ground would increase. 4. Michael started walking down his sidewalk at a speed of 2 m/s. He increased his speed to 3 m/s as he crossed a street. He then slowed to 1 m/s. Finally, when he came to the next street, he turned left and continued traveling 1 m/s. At what point in his trip did Michael accelerate? A. B. C. D. When he increased his speed from 2 m/s to 3 m/s. When he decreased his speed from 3 m/s to 1 m/s/. When he changed direction. All of the above. 5. True or False: Increasing the frictional force between a moving object and the ground will increase the object’s velocity. 6. In cold climates ice can form on streets and roads. Ice on a road can be dangerous because it is slippery and makes it difficult for cars to stop. Sometimes when ice appears, road crews will pour sand onto the road. Why would this be helpful? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 7. When a roller coaster travels down a hill, it experiences positive acceleration. What changes occur when this happens? A. Speed and frictional force decrease. B. Speed increases and frictional force decreases. C. Speed and frictional force increase. D. Speed increases and frictional force remains constant. 8. Beth pushed on her computer mouse and the mouse moved across her desk. What can be determined about the force of friction between the mouse and the desk? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 9. Which of the following would have the coefficient of friction (μ) value that is closest to zero? A. Sand paper pushed against sand paper. B. Smooth iced pushed against smooth ice. C. Sand paper pushed against smooth ice. D. Smooth ice pushed against gravel. 10. Nick is learning to drive a car. One of the car’s controls, the accelerator, positively accelerates the car every time that he pushes it. What should Nick expect to happen to his car after pushing the accelerator? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 11. Sam and Lesley are each pulling a speaker from the school’s music room to the auditorium. Both speakers have a mass of 50 kg; however, Sam’s speaker has double the surface area of Lesley’s speaker. Does Sam need to apply more force than Lesley to pull his speaker? Explain your answer. 50 kg Lesley’s Speaker gg50 kg 50 k Sam’s Speaker __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 12. Corey rode her bike on her city’s paved bike path. She started her trip traveling 4 m/s. She slowed down to 0.5 m/s as she biked up a hill, but she sped up to 7 m/s as she traveled down to the other side. At what point was the frictional force between the pavement and the bike the highest? A. When the bike was traveling 4 m/s. B. When the bike was traveling 0.5 m/s. C. When the bike was traveling 7 m/s. D. Frictional force was the same for all speeds. 13.What is the difference between weight and mass? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 14. What factors determine the strength of friction force when two surfaces slide against each other? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 15. State the law of universal gravitation. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 16.What is acceleration? _____________________________________________________________ _____________________________________________________________ 17.What is velocity? _____________________________________________________________ _____________________________________________________________ 18.What is the coefficient of friction? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 19.Define normal reaction force. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 20.What is applied force? _____________________________________________________________ _____________________________________________________________ 21. What does ΣF= ma stand for? _____________________________________________________________ _____________________________________________________________ 22.What is fluid friction? _____________________________________________________________ _____________________________________________________________ 23.Give an example of fluid friction. _____________________________________________________________ _____________________________________________________________ 24.What is rolling friction? _____________________________________________________________ _____________________________________________________________ 25.How much do objects accelerate as they fall? ____________________ 26.What is air resistance? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 27. Give two examples of how friction is useful. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 28.What is Newton’s First Law of Motion? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 29. An object in __________________ accelerates as it falls. 30.What is sliding friction? _____________________________________________________________ _____________________________________________________________ 31.Define terminal velocity. _____________________________________________________________ _____________________________________________________________