Ch. 4- work & energy
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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Work | The use of force to move an object in some distance.
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Joule | Unit of measurement when multiplying force and distance
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Equation to calculate Work | Force * Distance
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Potential Energy | the energy of motion
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Kinetic Energy | stored energy, or the energy that an object has due to its position or shape
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Mechanical Energy | the energy possessed by an object due to its motion or position (The objects combined/sum of potential and kinetic energy)
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Law of Conservation of Energy | No matter how energy is transferred/transformed, all energy is still present somewhere in one form or another
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Equation to calculate Gravitational Potential Energy (GPE) | Mass * Gravitational acceleration *height
aka: mgh
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Gravitational Potential Energy (GPE) | Potential Energy caused by gravity
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Equation to calculate Kinetic Energy | Mass * Velocity^2 / 2
aka: 1/2 mv^2
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Equation to calculate Mechanical Energy | Potential Energy + Kinetic Energy
aka. PE + KE
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Thermal Energy | the energy that an object has due to the motion of it's molecules
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Chemical Energy | The energy stored in chemical bonds that hold chemical compounds together
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Nuclear Energy | the potential energy stored in the nucleus of an atom.
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Electromagnetic Energy | the energy associated with electrical and magnetic interactions.
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Power | the rate at which you do work
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Watt | the unit of measurement for power (light bulbs, microwave, etc)
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Horsepower | measurement unit for power; the amount of work a horse can do per minute (motors, engines, tractors, etc)
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equation to calculate power (from work) | Work / Time
aka: W/t
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equation to calculate power (from energy) | Energy / time
aka: E/t
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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