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# Phys Sem.1 - Boren

### A review of concepts, equations, units, and variables for Semester 1 of Physics.

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

How fast something gets faster or how fast it slows down or how fast something changes direction. Also the change in velocity divided by time. Δv / Δt | acceleration |

How fast something is moving without regard to its direction. Also the distance traveled divided by time. d / t | speed |

Speed and direction. Also the displacement divided by time. Δx / Δt | velocity |

A push or a pull. | force |

A measure of how difficult it is to speed something up or get it to stop. | inertia (or Newton's 1st Law) |

The units for velocity. | meters per second, m/s |

The units for time. | seconds, s |

The units for mass. | kilograms, kg |

The units for force. | Newtons, N |

The units for acceleration. | meters per second squared, m/s² |

For every action force there is an equal but opposite reaction force. | Newton's 3rd Law |

The acceleration of an object is equal to the net force acting on it divided by its mass. a = Fnet / m | Newton's 2nd Law |

An objects change in position. | displacement |

The gravitational acceleration near the surface of the Earth. | g = 9.8 m/s² |

The variable for velocity. | v |

The variable for acceleration. | a |

The variable for force. | F |

The variable for time. | t |

The force that keep an object moving along a circular path. Also m·v²/r . | centripetal force |

The sum of the forces acting on a single object. | net force, Fnet |

When an object is allowed to fall without any significant forces holding it back. Its motion is determined by the gravitational acceleration. | freefall |

When forces acting on an object cancel out completely. The net force acting upon it is 0 N. The object may be at rest or moving with a constant velocity, but it will not accelerate. | balanced forces |

When forces acting on an object do not cancel out completely. The net force acting upon it is NOT zero. The object will accelerate. | unbalanced forces |

The velocity when an object is at rest, stationary, or stopped. This is also the initial velocity of an object that is dropped. | v = 0 m/s |

What you can determine from a position versus time graph of an object's motion (aka x vs. t graph). | slope = velocity |

What you can determine from a velocity versus time graph of an object's motion (aka v vs. t graph). | slope = acceleration |