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Number _________________ Name _____________________________________PHYSICS Honors Section 5-2 questions 1. If your book bag has a total mass of 3.00 kg what would be its mass if it were taken to Jupiter? Jupiter’s acceleration due to gravity is 10 times that of Earths. __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 2. Compare the force needed to lift a 10.0 kg rock on the Earth and on the moon. __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 3. Compare the force needed to throw a 10.0 kg rock horizontally at the same speed on earth and on the moon. __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 4. You place a carton of books on a handcart. When you accelerate the cart, the carton also accelerates. What supplies the force that accelerates the carton? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 5. Why does a package on the seat of a bus slide backward when the bus accelerates quickly from rest? Why does it slide forward when the driver applies the brakes? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 6. Suppose the acceleration of an object is zero. Does this mean there are no forces acting on it? Give an example supporting your answer. __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 7. When a basketball player dribbles a basketball, it falls to the floor and bounces up. Is a force required to make it bounce? Why? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 8. Drag racers often set their tires on fire to soften the rubber and increase the coefficient of friction. What is the role friction plays? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 9. Which creates a greater force of friction: sliding your physics book across a table on its back cover or along one of its edges? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 10. Is the coefficient of friction the same between two identical surfaces in a lab on Earth and in a lab in a space colony on the moon? Explain __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 11. The same object is dropped in a vacuum and then in air. Which of the parameters (distance, velocity, acceleration) vary and which remain constant during succeeding seconds of time a. in a vacuum? ____________________________________________________________________________________ b. in air when terminal velocity from air resistance has been reached? ____________________________________________________________________________________ 12. While riding in a helicopter, you drop two ping-pong balls, one filled with air and the other with water. Both experience air resistance as they fall. a. Which ball reaches terminal velocity first? ______________________________________ b. Do both hit the ground at the same time? Explain. ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________