Chapter+5,+book+1,+lesson+1

Chapter:5 energy and power I. the nature of energy A. energy - the ability to do work or cause change. 1. work- transfer of energy 2.kinetic energy - energy motion i. depends on object's masses and velocity ii. kinetic energy increases when velocity decreases 3.kinetic energy=mass x velocity2(Squared)/2 4. Changing the velocity of an object have a greater effect on its kinetic energy than changing its mass. B. potential energy 1. energy that is stored and held in readiness. i. elastic potential energy- the potential energy associated with objects that can be stretched or compressed. ii. gravitational potential energy - potential energy that depends on your height. a). force is the force you use to lift the object or its weight. b). distance the object moves or its height. c). gravitational potential energy= weight x height. d). unit of measure = joule or newton- meter e). greater weight of an object or greater height lifted. f). gravitational potential energy = mass x gravitational acceleration x height 1). unit of measure is joule. C. different forms of energy 1. mechanical energy- energy associated with the motion or position of an object. i. can be kinetic or potential energy. 2. thermal energy- total energy of the particles in a substance or material i. can be kinetic or potential energy 3. chemical energy-is potential energy stored in chemical bonds that hold chemical compounds together. 4. electrical energy - moving electric charges produce electricity. 5. electromagnetic energy- travels in waves. i. waves have electrical and magnetic properties. ii. light you see 6. nuclear energy - stored in the core or nucleus of an atom i. potential energy ii, nuclear fission- nucleus splits iii. nucleus fusion- nucleus fuses or join.

Quiz 5.1 1. by adding together its potential and kinetic energy 2. nuclear, electrical, chemical, thermal. 3. electrical, thermal, chemical , electromagnetic- stove. 4. bike- mechanical 5. toaster- mechanical electrical, thermal, electromagnetic 6. light- electrical, thermal, electromagnetic 7. sun - thermal, nuclear, electromagnetic 8. matches- mechanical, thermal, chemical, electromagnetic.