Presentation on theme: "WORK AND ENERGY. POTENTIAL ENERGY An object can store energy as the result of its position Potential energy is the stored energy possessed by an object."— Presentation transcript:
POTENTIAL ENERGY An object can store energy as the result of its position Potential energy is the stored energy possessed by an object
CALCULATING POTENTIAL ENERGY Potential energy = mass x acceleration of gravity x height Mass- kilograms Acc- m/s/s Height- m PE- joules (J) PE = mgh
PE EXAMPLES A stuntman is standing at the top of a 25 meter building. He has a mass of 72.6 kilograms. What is his potential energy? A 500 kg rollercoaster has 1102.5 kJ (or 1,102,500 J) at the peak of its first hill. How high is the hill?
KINETIC ENERGY What do you think the definition is?
KINETIC ENERGY Kinetic energy is the energy of motion Anything moving horizontally or vertically
CALCULATING KINETIC ENERGY Kinetic Energy = ½ x mass x velocity squared Mass- kilograms Velocity- m/s KE- Joules KE = ½mv 2
KE EXAMPLES Determine the kinetic energy of a 625-kg roller coaster car that is moving with a speed of 18.3 m/s. Missy Diwater, the former platform diver for the Ringling Brother's Circus, had a kinetic energy of 12 000 J just prior to hitting the bucket of water. If Missy's mass is 40 kg, then what is her velocity?
What is the relationship between kinetic energy and potential energy?