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Ty Phy Sci Chpt 9

Energy and Energy Resources

QuestionAnswer
the ability to do work energy
the energy of motion kinetic energy
the energy an object has because of its position or shape potential energy
the total energy of motion and position of an object mechanical energy
What is the equation for kinetic energy? (Mass x speed)/ 2
What is the formula for calculating gravitational potential energy? weight x height
What is the formula for calculating mechanical energy? potential energy + kinetic energy
What determines an object's thermal energy? its temperature, the arrangement of its particles, and the number of particles in the object
energy conversion a change from one form of energy into another
Describe an example in which electrical energy is converted into thermal energy. an iron, or a hair dryer
A car that brakes suddenly comes to a screeching halt. Is the sound energy produced in this conversion a useful form of energy? Why? It is not useful because it cannot be used to do work
a force that opposes motion between two surfaces that are touching friction
energy can be neither created or destroyed law of conservation of energy
Why is perpetual motion impossible? In every system, some of the energy put in is converted to thermal energy that is waste energy; so energy must be continually added
a natural resource that can be converted by humans into other forms of energy in order to do work energy resource
energy resources that cannot be replaced after they are used or that take thousands of years to replace nonrenewable resources
energy resources that can be used and replaced in nature over a relatively short period of time renewable resources
energy resources that formed from the buried remains of plants and animals that lived millions of years ago fossil fuels
Compare fossil fuels and biomass. Both result from living things and can be burned to release energy. However, fossil fuels are millions of years old while biomass is organic matter obtained from things living today.
Why is nuclear energy a nonrenewable resource? the elements from which it is generated are in limited supply
Created by: beth2244
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