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# PScienceSM2-U1

### Study stack for Physical Science Chapter 11 and 12

Term | Definition |
---|---|

frame of reference- | a system of objects that are not moving with respect to one another. |

relative motion,- | movement in relation to a frame of reference ex. people standing looking at train see people moving- people on train don't see self moving |

distance, | the length of a path between two points |

vector | a quantity that has magnitude and direction. Magnitude can be size, length, or amount |

resultant vector | the vector sum of two or more vectors |

speed -- | the ratio of the distance an object moves to the amount of time the object moves |

average speed | - is computed for the entire duration of a trip - average speed = total distance/total time |

instantaneous speed | is the rate at which an object is moving at a given moment in time ex. speedometer speed driving down the street |

velocity, | the speed and direction in which an object is moving |

acceleration, | as changes in speed, changes in direction, or changes in both. |

free fall, | the movement of an object toward Earth solely because of gravity. |

constant acceleration, | The velocity of an object moving in a straight line changes at a constant rate when the object is experiencing constant acceleration. |

Force | a push or a pull that acts on an object |

Newton | the force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per second each second |

Net Force | the overall force acting on an object after all the forces are combined. |

Friction | a force that opposes the motion of objects that touch as they move past each other. |

Static Friction | is the friction force that acts on objects that are not moving. |

Sliding Friction | a force that opposes the direction of motion of an object as it slides over a surface. |

Rolling Friction | the friction force that acts on rolling objects |

Fluid Friction | opposes the motion of an object through a fluid |

Air Resistance | Fluid friction acting on an object moving through the air |

Gravity | a force that acts between any two masses. Gravity is an attractive force, that is, it pulls objects together |

terminal velocity | the constant velocity of a falling object when the force of air resistance equals the force of gravity. |

projectile motion | the motion of a falling object (projectile) after it is given an initial forward velocity. Air resistance and gravity are the only forces acting on a projectile. |

Inertia | the tendency of an object to resist a change in its motion. |

Mass | is a measure of the inertia of an object and depends on the amount of matter the object contains. |

Weight | is the force of gravity acting on an object |

Momentum | the product of an object's mass and its velocity. |

Created by:
gilcherdonna