click below

click below

Normal Size Small Size show me how

# Chptr: 11 Kinematics

### This is a review over chapter 11 in the Physical Science 6th edition textbook.

Question/Term | Answer/definition |
---|---|

Define mechanics | the study of motion |

Define kinematics | the study of how things move |

Why did the Greeks think things moved as they did? | It was there nature |

who were the two scientists who worked together in 1600 to study the motion of planets | Tycho Brahe and Johannes Kepler |

Define Retrograde motion | the apparent reversal of planets in their orbits |

Who described that planets moved in elliptical, not circular, orbits? | Johannes Kepler |

How many laws of planetary motion did Kepler's work identify? | three laws |

What did Galileo descover? | all objects in a vacuum, regardless of mass, fall at the same rate. |

Classical mechanics | the study of how and why things move |

What did Isaac Newton develope? | the first truly mathematical model of motion |

What does Quantum mechanics describe? | the behavior of tiney objects |

What does relativistic mechanics explain? | the motion of high-speed objects |

Define frame of refrance | a coordinate system that we can use to describe the motion of objects |

define system | a portion of the larger motion that we are interested in studying |

What is the equation of displacement | ∆x=x𝓯-x𝓲 |

define scalar | any quantity that consists of magnitude, or size, only. |

define Vector | any quantity that consists of magnitude and direction. |

Define speed | the distance traveled in an amount of time |

Define velocity | the rate at which an object's position changes |

what is the formula for speed? | S=d/t |

What is the formula for velocity? | V=∆x/∆t |

Is speed a scalar quantity or a vector quantity? | Scalar quantity |

Is velocity a scalar quantity or a vector quantity? | vector quantity |

Define momentum | a property of a moving system that is equal to its velocity multiplied by its mass. |

What is the formula for momentum? | p=m(v) |

state the law of conservation of momentum | within a closed system---that is isolated from outside pushes or pulls--- the total momentum remains constant. |

Define acceleration | The change in velocity in a given amount of time |

What is the formula for Acceleration? | a=∆v/∆t |

Define free fall | the motion of objects that fall due to gravity alone with no other forces acting on them |

what is the approximate value of free fall? | 9.81m/s |

Define circular motion | motion moving in a circular path |

Define centripetal acceleration | Acceleration that causes an object to move along a circular path. It always accelerates an object toward the center of a circle. |

Define projectile motion | a two-dimensional motion of any flying object whose path is determined by the influence of external forces only, such as gravity. |

Define trajectory | when a projectile follows a curved path |

Define linear motion | Objects that move along in a straight path. |