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Work, Power, and Energy Assessment HMS 2015 Which would involve doing the most work? Which would involve doing the most work? Which person has the most power? Which person has the most power? What is the ability to do work or cause change? What is the ability to do work or cause change? ENERGY What is the energy an object has due to motion? What is the energy an object has due to motion? Kinetic Energy Which ball has more kinetic energy? Ball Masses Velocity A 20 kg 10 m/s B 25 kg 10 m/s Which ball has more kinetic energy? Ball Masses Velocity A 20 kg 10 m/s B 25 kg 10 m/s Which ball has more kinetic energy? Ball Masses Velocity C 30 kg 40 m/s D 30 kg 32 m/s Which ball has more kinetic energy? Ball Masses Velocity C 30 kg 40 m/s D 30 kg 32 m/s What is energy stored within an object? What is energy stored within an object? Potential Energy Which 2 factors does gravitational potential energy depend on? Which 2 factors does gravitational potential energy depend on? Weight and Height Pulling back the string of a bow is an example of what type of energy? Pulling back the string of a bow is an example of what type of energy? Elastic Potential Energy Using the image below, explain why one of the skiers has greater gravitational potential energy? Using the image below, explain why one of the skiers has greater gravitational potential energy? The one on the right has more gravitational potential energy because he weighs more Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy is this? • • • • • Mechanical Electromagnetic Electrical Thermal Chemical Which type of energy occurs continuously in the sun? Which type of energy occurs continuously in the sun? Nuclear Energy What do you call the change from one form of energy to another? What do you call the change from one form of energy to another? Energy Transformation Lighting a match requires multiple energy transformations? T or F Lighting a match requires multiple energy transformations? T Which law states that energy cannot be created nor destroyed? Which law states that energy cannot be created nor destroyed? Law of Energy Conservation Why, when you drop a golf ball, will it not bounce up to the same height it was dropped from? Why, when you drop a golf ball, will it not bounce up to the same height it was dropped from? • Some energy is transformed into thermal energy • Some energy is transformed into sound energy What is a material that forms over millions of years from the remains of ancient plants and animals? What is a material that forms over millions of years from the remains of ancient plants and animals? A fossil fuel Which are fossil fuels? Which are fossil fuels? You are at Mt. Olympus and riding the roller coaster, Pegasus. The roller coaster pulls you up a distance of 50 m while exerting a force of 8000 N, how much work is being done by the roller coaster? You are at Mt. Olympus and riding the roller coaster, Pegasus. The roller coaster pulls you up a distance of 50 m while exerting a force of 8000 N, how much work is being done by the roller coaster? W=F * D W=8000 * 50 400,000 J You are dog sitting your neighbor’s pet this summer, and are pulling Fido in a wagon. You are exerting a force of 250 N. You move the wagon a distance of 40 m over 70 seconds. How much power was exerted? You are dog sitting your neighbor’s pet this summer, and are pulling Fido in a wagon. You are exerting a force of 250 N. You move the wagon a distance of 40 m over 70 seconds. How much power was exerted? P=w/t P= (f * D)/t P= (250 * 40)/70 P=10000/70 142.86 W Randy Moss is timed at running the 100 meter dash (when he was 14 years old) at a speed of 10.96 m/s while weighing 36 kg. What was his kinetic energy during the race? Randy Moss is timed at running the 100 meter dash (when he was 14 years old) at a speed of 10.96 m/s while weighing 36 kg. What was his kinetic energy during the race? KE= ½ * m * v2 KE=1/2 * 36 * 10.962 KE= .5 * 36 * 120.1216 2162.1888 J Jeff Brushie, 1991 World Cup Halfpipe Champion is at the top of a snow covered halfpipe that is 6.7 m tall. He has a weight of 550 N. What is his gravitational potential energy? Jeff Brushie, 1991 World Cup Halfpipe Champion is at the top of a snow covered halfpipe that is 6.7 m tall. He has a weight of 550 N. What is his gravitational potential energy? GPE=w * h GPE=550 * 6.7 3685 J This review has been brought to you by… This review has been brought to you by… The Letter This review has been brought to you by… The Letter And Ms. Zeke’s mom