# Physics Test Ch 1-6

rename
gisexeru's
version from
2016-09-19 18:38

## Section 1

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

Language of science - Equations are guides of thinking | Math |

Scientific method | 1. Recognize problem: 2. Make hypothesis: 3. predict outcome: 4. Exxperiment: 5. Form general rule: 6. Publish ressults |

Willingness to admit error. Experimentation | Scientific Attitude |

A scientific theory MUST | Be falsifiable and consistent with previous theories |

basic science | Physics |

Who discovered that objects of different weights all fall at same speed with no air resistance? | Galileo |

## Section 2

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

Push or pull on an object | Force |

Property of matter to resist changes in motion | Inertia |

Newtons First law | Law of Inertia - Object in rest stays at rest unless acted upon by force |

Combination of force and direction | Net force |

Size (magnitude) and direction = quantity | Vector quantity - Arrows - length represents magnitude and arrow head shows direction. |

vector sum of forces acting on a non-accelerating object equals zero. EF = 0 | Equilibrium Rule |

Upward force on an object that is opposite to the force of gravity | Support force. Example: book on a table |

State of no change with no net force acting | Equilibrium |

Static equilibrium | object at rest |

Dynamic equilibrium | object at constant speed |

## Section 3

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

Distance covered per amount of travel time. m/s | Speed |

entire distance covered divided by tht total travel time | Average speed |

Description of instantaneous speed of an object and what direction object is going | Velocity |

Constant direction (straight line path with no acceleration) | Constant Velocity |

Change in speed over time and/or change in direction. | Acceleration |

10 m/s | Gravity |

Proportional to net force and inversely proportioinal to mass | Acceleration |

Force upon an object due to gravity. Measured in Newtons (N) | Weight |

W = mg or F= (100kg)(10m/ssquared) = 1000N | |

## Section 4

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

Newton's second law. a = F/m. F=ma = kg x m/s squared = (kg x m/ssquared = N | Law of acceleration. |

The greater the mass of the object the greater the force of attraction toward earth. acceleration is the same | Free Fall |

Newtons third law. | Whenever 1 object exerts a force on a second object, the second object exerts an equal and opposite force on the first. Action and Reaction forces |

The force that pushes back up to oppose gravity | Contact Force |

## Section 5

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

Property of moving things. = m x v (mass times velocity) | Momentum | |

force x time or F x t. Example: a brief force applied over a short time interval productes a smaller change in momentum than the same mforce applied over a longer time interval) | Impulse | |

increasing momentum | apply the greatest force for as long as possible | |

Decresing momentum | extend time during which momentum is reduced | |

In the absence of external force, the momentum of a system remains unchanged. Example: cannon firing = both amount of force is exerted on both ball and cannon | Law of Conservation of Momentum | |

(net mv)before = (net mv)after | Collitions - Net momentum before collision = net momentum after collision | |

Occurs when colliding objects rebound without lasting deformation. Example | car at 10 m/s collides with a car at rest of equal mass, (m x 10)before = (2m x V)after = V = 5 m/s | Elastic Collisions |

occurs when colliding objects result in deformation | Inelastic collisions | |

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