Intro to Energy

Energy ability to do work. Energy is a scalar. General symbol for energy is E. Energy is measured in Joules (J) 1 Forms of Energy All forms of energy fall into 2 basic types Potential Energy Kinetic Energy stored energy energy of motion H Mechanical Kinetic C H Chemical Energy Energy H Nuclear Energy Radiant Energy Mechanical Potential Thermal Energy Energy Electrical Energy 2 Mechanical Energy: Gravitational Potential Energy Gravitational Potential Energy energy the object has due to its position in Earth's (or other planet's) gravitational field. 3 4 PE = mgh where PE gravitational potential energy m mass of the object g acceleration due to gravity h height of the object above the "zero" position 5 Problem Time! Example 1: Legend has it that Isaac Newton “discovered” gravity when an apple fell from a tree and hit him on the head. If a 0.20 kg apple fell 7.0 m before hitting Newton, what was its change in PE during the fall? 6 Example 2: A Mexican jumping bean jumps with the aid of a small worm that lives inside the bean. If a bean of mass 2.0 g jumps 1.0 cm from your hand into the air, how much potential energy has it gained in reaching its highest point? 7 Example 3: A flea gains 1.0x107J of potential energy jumping up to a height of 0.030 m from a dog’s back. What is the mass of the flea? 8 Mechanical Energy: Kinetic Energy Kinetic Energy energy of motion. Any object that has velocity possesses kinetic energy. KE = 1/2 mv2 where KE kinetic energy m mass of the object v velocity of the object 9 What happens to the Kinetic Energy if 1. Mass doubles? 2. Velocity doubles? 3. Mass triples? 4. Velocity triples? 5. Mass doubles & velocity doubles? 6. Mass halves? 7. Velocity halves? 8. mf=mi/3 and vf=vi/3 9. mf=mi/4 and vf=vi/4 10 Problem Time! Example 1: The 2000 Belmont Stakes winner, Commendable, ran the horse race at an average speed of 15.98 m/s. If commendable and jockey Pat Day had a combined mass of 550.0 kg, what was their KE as they cross the finish line? 11 Example 2: Missy Diwater, the former platform diver for the Ringling Brother's Circus had a kinetic energy of 15 000 J just prior to hitting the bucket of water. If Missy's mass is 50 kg, then what is her speed? 12.

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250000 Pat Day Mile Presented by LG&E and KU
$250,000 Pat Day Mile Presented by LG&E and KU (Grade III) 92nd Running – Saturday, May 7, 2016 (Kentucky Derby Day) 3-Year-Olds at One Mile on Dirt at Churchill Downs Stakes Record – 1:34.18, Competitive Edge (2015) Top Beyer Speed Figure – 112, Richter Scale (1997) Average Winning Beyer Speed Figure (since 1992) – 99.9 (2,398/24) Name Origin: Formerly known as the Derby Trial, the one-mile race for 3-year-olds was moved from Opening Night to Kentucky Derby Day and renamed the Pat Day Mile in 2015 to honor Churchill Downs’ all-time leading jockey Pat Day. Day, enshrined in the National Museum of Racing’s Hall of Fame in 2005, won a record 2,482 races at Churchill Downs, including 156 stakes, from 1980-2005. None was more memorable than his triumph aboard W.C. Partee’s Lil E. Tee in the 1992 Kentucky Derby. He rode in a record 21 consecutive renewals of the Kentucky Derby, a streak that ended when hip surgery forced him to miss the 2005 “Run for the Roses.” Day’s Triple Crown résumé also included five wins in the Preakness Stakes – one short of Eddie Arcaro’s record – and three victories in the Belmont Stakes. His 8,803 career wins rank fourth all-time and his mounts that earned $297,914,839 rank second. During his career Day lead the nation in wins six times (1982-84, ’86, and ’90-91). His most prolific single day came on Sept. 13, 1989, when Day set a North American record by winning eight races from nine mounts at Arlington Park.
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John R. Velazquez Born: Nov. 24, 1971 in Carolina, Puerto Rico Family
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750 Tarantino 2018 on 12-May-21 (C) Copyright 2021
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Alphabet Soup Fraise Amazombie Gulch Black Tie Affair Little Mike Cajun Beat Precisionist Eldaafer Prized
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Work, Power and Energy
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