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# Phys Sem.2 - Boren

### A review of concepts, equations, units, and variables for Semester 2 of Physics.

Question | Answer |
---|---|

The units for momentum. | kilograms times meters per second, kg · m / s |

An object's mass multiplied by its velocity (m · v). | momentum |

The variable for momentum. | p |

The total momentum before a collision is equal to the total momentum after a collision. | conservation of momentum |

Force applied over a distance. | work |

The units for work. | Joules, J |

The variable for work. | W |

The amount of work done per second. Also work divided by time (W / t). | power |

The units for power. | watts, W |

The variable for power. | P |

The energy from an object's motion. (½ · m · v²) | kinetic energy |

The energy due to an object's position. | potential energy |

The energy due to an object's height and also due to gravity. (m · g · h) | gravitational potential energy |

The units for kinetic energy. | Joules, J |

The units for potential energy. | Joules, J |

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 |

The variable for kinetic energy. | KE |

The variable for potential energy. | PE |

The units for electrical charge. | Coulombs, C |

The variable for electrical charge. | q |

The amount of charge per second that flows past a spot on a wire. Also charge divided by time (q / t). | current |

The units for current. | amperes, A |

The variable for current. | I |

The force of attraction or repulsion between objects that are electrically charged. | electrostatic force |

The units for electrostatic force. | newtons, N |

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 |

The force multiplied by the time of contact (F · Δt). It is also equivalent to an object's change in momentum. | impulse |

The units for impulse. | N · s OR kg · m / s |

When an electrically charged object charges another object by simply touching. | charging by conduction |

When an electrically charged object charges part of another object by moving near it without touching. | charging by induction |

When an two objects rub against each other and one object transfers some of its electrons to the other object. | charging by friction |

The electrical potential energy divided by its charge. Also how strong a battery is. | voltage OR potential difference |

The units for voltage or potential difference. | volts, V |

The variable for voltage or potential difference. | V |

How much a component in a circuit (such as a lightbulb) prevents current from flowing through it. | resistance |

The units for resistance. | ohms, Ω |

The variable for resistance. | R |

A circuit that branches off along different paths with different resistors before coming back together again. | parallel circuit |

A circuit that is made from multiple resistors in a row (one after another) without branching paths. | series circuit |

The current travelling through a circuit is equal to its voltage divided by its resistance (I = V / R) | Ohm's law |

The equation for the total resistance (or equivalent resistance) of a parallel circuit. | 1 / Rᴛ = 1 / R₁ + 1 / R₂ + ... |

The equation for the total resistance (or equivalent resistance) of a series circuit. | Rᴛ = R₁ + R₂ + ... |

The height of a wave from the middle line to the crest OR from the middle line to the trough. | amplitude |

The distance from one crest to the next crest OR from one trough to the next trough. | wavelength |

The number of waves that pass per second. | frequency |

The wave phenomena which has a wave bounce off a surface. | reflection |

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 |

The wave phenomena whereby waves spread out and form interference patterns when they pass through a slit. | diffraction |

Created by:
john.boren