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# Physics Review

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

Expression for velocity. | v=x/t |

Expression for acceleration. | a=v/t |

Value for the acceleration of objects in free fall. | 9.8 meters per second squared |

Physical quantity that has both a magnitude and direction. | vector |

If a certain car is traveling down the road at a certain velocity and then slows down to travel only half as fast as before. What fraction would this be of the original velocity? | 1/2 |

Coordinate system for specifying the precise location of objects in space. | frame of reference |

Cause of acceleration or a change in an object's motion. | force |

Forces that exist between objects even in the absence of direct physical contact. | field force |

Tendency of an object to maintain its state of motion. | inertia |

Newton's Second Law of Motion | F=ma |

Simultaneous equal but opposite forces resulting from the interaction of two objects. | action-reaction pairs |

Formula for work. | W=Fx |

Work is done when | displacement is not zero. |

Form of energy associated with an object in motion. | kinetic energy |

Form of energy associated with an object due to its position. | potential energy |

Equations for power. | P=F d/t or P=Fv or P=W/t |

Equation for momentum. | p=mv |

Forces that exist between objects in direct contact. | contact forces |

A large constant force acting over a long time interval causes a large change in momentum. | Ft=p |

Two objects move separately after colliding, and both the total momentum and total kinetic energy remain constant. | elastic collision |

Two objects move together after colliding, and and kinetic energy is not conserved. | inelastic collision |

Angles equals 2 pi rad | 360 degrees |

One radian equals | 57.3 degrees |

Quantity that measures the ability of a force to rotate or accelerate an object around an axis. | torque |

Farther the force is from the axis of rotation | more torque produced |

Newton's second law for rotating objects | net torque = moment of inertia x angular acceleration |

Time it takes to complete a cycle of motion | period |

Relation of frequency and period in simple harmonic motion | inversely related |

Phase difference between two waves that are traveling in the same medium when they undergo constructive interference. | 0 degrees |

How we perceive sound (high or low) depends on the frequency of the sound wave | pitch |

Number of cycles per unit of time | frequency |

Repelling force occurs between two charged objects when | charges are of like sign. |

Attracting force occurs between two charged objects when | charges are of unlike signs. |

Easily transfers charge | conductors |

Does not easily transfer charge | insulator |

Charges on their surface do not move | electric insulator |

Three resistors connected in series carry currents. | I total = I1 = I2 = I3 |

Three resistors connected in series have voltages. | ΔV total = ΔV1 + ΔV2 + ΔV3 + |

Three resistors connected in series have resistance. | R total = R1 + R2 + R3 + |

Three resistors connected in parallel carry currents. | I total = I1 + I2 + I3 + |

Three resistors connected in parallel have voltages. | ΔV total = ΔV1 = ΔV2 = ΔV3 |

Three resistors connected in parallel have resistance. | 1/R total = 1/R1 + 1/R2 + 1/R3 + |