Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 4 types of energy in physics: KE, PEg , PEs, Q
Document related concepts
Efficient energy use wikipedia , lookup
Directed-energy weapon wikipedia , lookup
Work (physics) wikipedia , lookup
William Flynn Martin wikipedia , lookup
Open energy system models wikipedia , lookup
Dark energy wikipedia , lookup
Energy subsidies wikipedia , lookup
Energy storage wikipedia , lookup
100% renewable energy wikipedia , lookup
Low-Income Home Energy Assistance Program wikipedia , lookup
Public schemes for energy efficient refurbishment wikipedia , lookup
Zero-energy building wikipedia , lookup
Low-carbon economy wikipedia , lookup
World energy consumption wikipedia , lookup
Alternative energy wikipedia , lookup
Energy Charter Treaty wikipedia , lookup
Potential energy wikipedia , lookup
Life-cycle greenhouse-gas emissions of energy sources wikipedia , lookup
International Energy Agency wikipedia , lookup
Energy policy of the United Kingdom wikipedia , lookup
Energy returned on energy invested wikipedia , lookup
Distributed generation wikipedia , lookup
Energy harvesting wikipedia , lookup
Energy policy of Finland wikipedia , lookup
Energy in the United Kingdom wikipedia , lookup
Energy efficiency in transport wikipedia , lookup
Kinetic energy wikipedia , lookup
Internal energy wikipedia , lookup
Negawatt power wikipedia , lookup
Regenerative brake wikipedia , lookup
Energy policy of the European Union wikipedia , lookup
United States energy law wikipedia , lookup
Energy efficiency in British housing wikipedia , lookup
Energy applications of nanotechnology wikipedia , lookup
Energy Independence and Security Act of 2007 wikipedia , lookup
Transcript
Reference Table Review Mechanical Energy: Sum of all the Kinetic and Potential Energy 4 types of energy in physics: KE, PEg , PE s, Q kinetic energy gravitational potential energy elastic potential energy Internal Energy (heat) only 3 of them figure into mechanical energy: not part of mechanical energy velocity = 4.0 m/s 2.0 kg What is the Total Mechanical Energy of the block at the instant shown in this diagram 1.5 meters h = 0 Total Mechanical Energy Conservation of ENERGY The total energy of a closed and isolated system remains constant in equation form: Conservation of Energy vi = 0 This Anvil has a gravitational potential energy of 100 Joules cliff What is its kinetic energy just as it reaches the ground? h = 0 1. ID the system of objects and types of energy involved 2. set total sum of E's in one place = total sum of E's in another 3. expand and solve for unknown 98 N 50 m Find..... a) the work done lifting it up b) the gravitational potential after lifting it up c) the Kinetic energy it will have if it is dropped and falls down 50 m (just before hit no air resist.) A rock is thrown downward with an unknown initial speed from a height of 5.0 m. Just prior to striking the ground, the rock's speed is 15 m/s. Ignoring air resistance, use conservation of energy to determine the rock's initial speed. 5.0 m cliff 1 4.0 m/s m= 250 kg 3 35 m h Assuming the car is moving to the right at 4.0 m/s at position 1, determine: a) velocity at position 2 2 9.0 m No friction or air resistance. a) 4 b) if the car is moving to the right at 12.4 m/s at position 3, what is height, h? c) How much kinetic energy does the car possess in position 4? 1 m= 250 kg 3 35 m h 2 9.0 m No friction or air resistance. Assuming the car is moving to the right at 4.0 m/s at position 1, determine 4 b) if the car is moving to the right at 12.4 m/s at position 3, what is height, h? 1 m= 250 kg 3 35 m h Assuming the car is moving to the right at 4.0 m/s at position 1, determine 2 9.0 m No friction or air resistance. c) How much kinetic energy does the car possess in position 4? 4
