Concept explainers
Here’s a great everyday use of the physics described in this chapter. If you are trying to get ketchup out of the bottle, the best way to do it is to turn the bottle upside down and give the bottle a sharp upward smack, forcing the bottle rapidly upward. Think about what subsequently happens to the ketchup, which is initially at rest, and use Newton’s first law to explain why this technique is so successful.
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- What forces act on you as you walk across a room? Draw a free-body diagram showing all of them. Which force or forces propel you forward? Why is it more difficult to walk on a slippery surface than on a nonslippery one? Explain how you use Newtons third law to control your motion.arrow_forwardDoes the ground need to exert a force on you for you to jump off the ground, or do you need to exert a force on the ground? If the ground must exert a force on you, is that force greater than the force you exert on the ground?arrow_forwardDrawing Free-Body Diagrams In completing the solution for a problem involving forces, what do we do after constructing the tree-body diagram? That is, what do we apply?arrow_forward
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- Which of the following scenarios demonstrates Newton's 2nd Law? A. A planet exerts an attractive force on all objects on its surface. B. A box sliding on the floor slowly comes to a rest due to friction.arrow_forwardConsider applying Newton's second law to a man riding an elevator (perhaps calculating his acceleration)Which of the following forces must be considered? Choose all that apply.1.) The force that the man's feet exert on the floor of the elevator. 2.) The force of gravity on the elevator. 3.) The force of the elevator cable exerts on the elevator car. 4.) The force that the elevator floor exerts on the man's feet. 5.) The force of gravity on the man. 6.) The force that the man's head exerts on his neck.arrow_forwardSuppose that during the launch of a rocket from the surface of the Earth, an astronaut onboard the rocket stands on a bathroom scale and measures her weight to be 2.7 times her normal weight. Determine the magnitude of the acceleration of the rocket.arrow_forward
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