A review of concepts, equations, units, and variables for Semester 2 of Physics.
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| The units for momentum. | kilograms times meters per second, kg · m / s
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| An object's mass multiplied by its velocity (m · v). | momentum
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| The variable for momentum. | p
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| The total momentum before a collision is equal to the total momentum after a collision. | conservation of momentum
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| Force applied over a distance. | work
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| The units for work. | Joules, J
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| The variable for work. | W
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| The amount of work done per second. Also work divided by time (W / t). | power
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| The units for power. | watts, W
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| The variable for power. | P
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| The energy from an object's motion. (½ · m · v²) | kinetic energy
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| The energy due to an object's position. | potential energy
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| The energy due to an object's height and also due to gravity. (m · g · h) | gravitational potential energy
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| The units for kinetic energy. | Joules, J
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| The units for potential energy. | Joules, J
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| The total energy before an object falls is equal to the total energy right before it hits the ground. (PE₁ + KE₁ = PE₂ + KE₂) | conservation of energy
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| The variable for kinetic energy. | KE
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| The variable for potential energy. | PE
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| The units for electrical charge. | Coulombs, C
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| The variable for electrical charge. | q
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| The amount of charge per second that flows past a spot on a wire. Also charge divided by time (q / t). | current
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| The units for current. | amperes, A
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| The variable for current. | I
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| The force of attraction or repulsion between objects that are electrically charged. | electrostatic force
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| The units for electrostatic force. | newtons, N
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| The strength of an electrostatic force is equal to the constant times both charges divided the their distance squared (ke · q₁ · q₂ / r²). | Coulomb's law
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| The force multiplied by the time of contact (F · Δt). It is also equivalent to an object's change in momentum. | impulse
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| The units for impulse. | N · s OR kg · m / s
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| When an electrically charged object charges another object by simply touching. | charging by conduction
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| When an electrically charged object charges part of another object by moving near it without touching. | charging by induction
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| When an two objects rub against each other and one object transfers some of its electrons to the other object. | charging by friction
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| The electrical potential energy divided by its charge. Also how strong a battery is. | voltage OR potential difference
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| The units for voltage or potential difference. | volts, V
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| The variable for voltage or potential difference. | V
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| How much a component in a circuit (such as a lightbulb) prevents current from flowing through it. | resistance
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| The units for resistance. | ohms, Ω
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| The variable for resistance. | R
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| A circuit that branches off along different paths with different resistors before coming back together again. | parallel circuit
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| A circuit that is made from multiple resistors in a row (one after another) without branching paths. | series circuit
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| The current travelling through a circuit is equal to its voltage divided by its resistance (I = V / R) | Ohm's law
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| The equation for the total resistance (or equivalent resistance) of a parallel circuit. | 1 / Rᴛ = 1 / R₁ + 1 / R₂ + ...
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| The equation for the total resistance (or equivalent resistance) of a series circuit. | Rᴛ = R₁ + R₂ + ...
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| The height of a wave from the middle line to the crest OR from the middle line to the trough. | amplitude
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| The distance from one crest to the next crest OR from one trough to the next trough. | wavelength
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| The number of waves that pass per second. | frequency
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| The wave phenomena which has a wave bounce off a surface. | reflection
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| The wave phenomena whereby waves change speed as they pass from one medium to a different medium. This changes the angle of the waves slightly. | refraction
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| The wave phenomena whereby waves spread out and form interference patterns when they pass through a slit. | diffraction
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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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Created by:
john.boren
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