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Transcript
Energy • Identify several forms of energy. Calculate Kinetic Energy Distinguish between kinetic energy and Potential energy • Classify different types of potential Energy • Calculate Potential energy associated with an object • • Energy: Ability to do work Different Types of Energy The Ninja, a roller coaster at Six Flags over Georgia, has a height of 122 ft and a speed of 52 mi/h. The potential energy due to its height changes into kinetic energy of motion. Energy Mechanical Kinetic Non Mechanical Potential Gravitational Elastic Kinetic Energy Aim: What is a Kinetic Energy? Kinetic Energy - the energy an object possesses due to its' motion KE = 2 (½)mv Relationship KE/v? Direct Square Work and Kinetic Energy A resultant force changes the velocity of an object and does work on that object. v f vf F F Work mv mv 1 2 2 f 1 2 2 0 Example: A 60.0-kg runner has 1920 joules of kinetic energy. At what speed is he running? KE = (½)mv2 m = 60.0 kg KE = 1920 J V=? 1920 J=(1/2)60.0kgV2 1920 J = 30 V2 64.0 = V2 V = 8.00 m/s A car with a mass of 1,300 kg is going straight ahead at a speed of 30 m/sec (67 mph). The brakes can supply a force of 9,500 N. Calculate: a) The kinetic energy of the car. b) The distance it takes to stop. M= 1300 kg, v= 30m/s, F= 9500 N KE= ½ m𝑣 2 = ½ (1300kg)(30𝑚./𝑠)2 KE= 5.85x102 J W= ∆ 𝐾𝐸 2 F.d= ½ (m𝑉𝑓2 )- ½ (m𝑣𝑖2 )= 9500N.d=0J-1/2(1300 Kg)(30m/s) D= 61.57m
