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جامعة الملك عبدالعزيز KING ABDULAZIZ UNIVERSITY PHYS 110 Ch. 8 Potential Energy and Conservation of Energy Physics Department Chapter 8 Chapter Eight Potential Energy and Conservation of Energy 2 Work and Potential Energy Conservation of Mechanical Energy Work Done on a system by an External Force Conservation of Energy Physics Department Work and Potential Energy 3 Physics Department Work and Potential Energy 4 Physics Department Work and Potential Energy 5 Physics Department Work and Potential Energy Example 1 : A force F causes the 2 kg box to slide up from point A to point B. The gravitational potential energy gained by the box is: Solution: (A) (A) 35.28 J (B) 28.40 J (C) 88 J (D) 270 J B A F 6 5.6 m 1.8 m 300 Physics Department Conservation of Mech. Energy 7 Physics Department Conservation of Mech. Energy Example 2: In a sliding game at a fun fair, a child train was sliding in different heights. If the train slipped from height A 10 m till height B 7 m. The speed of the train at point B is Solution: (C) (A) 10.3 m/s (B) 9.87 m/s (C) 7.67 m/s (D) 6.42 m/s 8 Physics Department Work Done on Sys. by an Ext. Force 9 Physics Department Work Done on Sys. by an Ext. Force 10 Physics Department Work Done on Sys. by an Ext. Force Example 3: A car of mass 2000 kg moving on a rough road at speeds of 25 m/s, and then begins to slow down till it’s stop after 200 m. The frictional force that caused the car to stop is: Solution: (B) (A) 2456 N (B) 3125 N (C) 5620 N (D) 7435 N 11 Physics Department Conservation of Energy 12 Physics Department