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Unit 2 Energy and Work Exam
Terms in this set (52)
What is the work equation?
W = F x d
the force applied to move an object over a distance
What is positive work?
When force and distance are in the same direction
What is negative work?
When force and distance are in the opposite direction
What is zero work?
When force and distance are perpendicular or when force or distance is missing
Is it work when carrying a backpack across campus?
No, because force and distance are perpendicular. Force is being applied up and the backpack is moving forward.
What is energy?
the ability to cause change or do work
What is the measurement for work, kinetic energy, and potential energy?
How does work relate to energy?
Work transfers energy from one place to another
What is potential energy?
Energy that is stored due to an objects position
What are the five kinds of potential energy?
Mechanical stored, Gravitational PE, Elastic PE, Nuclear PE, Chemical PE
How is gravitational potential energy calculated?
PE = mgh
What is the constant for gravity at earth's surface?
What is kinetic energy?
Energy due to an object's motion
What are the five types of kinetic energy?
Mechanical, sound, electrical, radiant, and thermal
What is the equation for Kinetic energy?
(^2 means squared)
State the law of conservation of energy.
Energy cannot be created nor destroyed, it can only change forms or be transferred
Anything that can fall has...
gravitational potential energy
The sun shining in the afternoon is an example of what energy?
What is a renewable resource?
It can be replenished faster than humans can consume it
What are examples of renewable energy resources?
solar, wind, geothermal, and water
What is a nonrenewable energy resource?
It cannot be replenished faster than humans can consume it
What are examples of nonrenewable energy resources?
Oil, gas, petroleum, and nuclear energy
What are two alternative energy sources discussed in the notes?
Hydrogen cells: use hydrogen to react with air and oxygen to act like a battery
Biomass fuels: burning or organic matter such as wood, soybeans, corn, or manure to produce energy
How is nuclear energy produced?
Splitting the atom to release heat and radiation
What are advantages of nuclear energy?
Produces a lot of energy
no CO2 production
cleaner than fossil fuels
What are disadvantages of nuclear energy?
Catastrophic accidents can happen
No plan for nuclear waste disposal
What are the sources for renewable energy we discussed?
Which renewable energy sources uses moving water to create electricity?
What converts solar energy into electrical energy?
What is a pollutant?
Anything that contaminates the environment
What are ways human contaminate the environment?
agriculture, plastics, burning fossil fuels
What is radioactive waste called?
What is thermal energy?
Measure of KE and PE
What is temperature?
Measure of average KE
What is heat?
Energy transferred between objects do to temperature differences
What is Conduction?
transfer of energy from one place to another by contact ex. stirring spoon in coffee cup
What is convection?
Transfer of heat energy through a fluid (liquid or gas) lava lamp
What is radiation?
The transfer of energy by electromagnetic waves ex. car heating up in sun
A spoon absorbing heat from hot coffee is an example of...
A car warming up in the hot sun is an example of...
A lava lam is an example of ...
What is the first law of thermodynamics?
There are two ways to increase the temperature of a system: do work or add heat
What is the second law of thermodynamics?
Energy spontaneously moves from high to low (warm to cool)
In an isolated system energy cannot...
be lost or gained, but it can change forms
An example of energy changing forms is when it changes ...
Is nuclear energy renewable ?
NO because there is a limited supply of uranium
Petroleum, oil, and natural gas are examples of...
What energy sources do not have a negative impact on the environment?
solar, wind, water, geothermal
What are the units for distance and height?
What is the secret to passing this test?
There is no secret just study until you can't get these questions wrong
What is the secret to getting the math correct?
There is no secret, write the equation, show your work, and double check your answers. Plus Practice, practice, practice.
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