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Unformatted text preview: Physics 7A Exit Handout from DLM 06 Note: Graph paper can be found in the lab room or downloaded from the Physics 7 website. If you ran out of time in DL, finish Activity 2.2.3 (Checking Understanding With a New Phenomenon) now. 2.3-1) A 300-g ball is thrown straight up into the air. It is exactly 2 m above the ground when it is released. It reaches a height 12 m above the height from which it was released , and then falls straight back down. a) Assume that y = 0 is located at the point of release of the ball . Find the maximum and minimum values of y and PE g . What is the total energy of the system? Find the maximum and minimum values of KE. b) Repeat part (a) , with y = 0 located at the ground . 2.3-2) A 200-g mass is attached to a spring as in DL. The mass is lifted up 5 cm and released so that the mass begins to oscillate about the equilibrium point. The spring has a spring constant k = 500 N/m (J/m 2 ). a) Calculate and accurately plot on a full size (8.5 x 11 in.) sheet of graph paper PE spring-mass , E total , and KE . The vertical axis of the graph should be energy (joules). The horizontal axis is distance from equilibrium. b) On the same graph, quickly sketch (without calculating values) the PE, KE and E tot of the system if the mass were initially pulled back (stretched) 2.5 cm from its equilibrium point, instead of lifted up (compressed) 5 cm. initially pulled back (stretched) 2....
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- Spring '08