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# Physics test 1

### Test Date: 9/29/2015

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

Gravity | The force that attracts one object towards the center of the earth, or any other object of mass |

Acceleration | Acceleration is the rate at which velocity is changing with respect to time |

Acceleration FORMULA | speed/time or distance/time/time or ΔV/time |

Velocity | Velocity is speed together with time Velocity is only constant when speed and direction are BOTH constant |

Velocity FORMULA | Distance/time in a direction |

Speed | Speed is a measure of how fast something is moving. |

Speed FORMULA | Distance/time |

What did we learn from the 1st car ramp experiment? | The steeper the angle of the car's ramp, the faster the car travels because gravity is helping more as the ramp gets steeper |

What did we learn from the 1st marble drop experiment? | As the measured distance of the fall increases, the speed at PB increases, showing proof of acceleration |

What did we learn from the 2nd marble drop experiment? | TBD |

What did we do in the 1st car ramp experiment? | Each group was assigned a height to place one end of the ramp at, and then we found the average speed at each height, and then shared with the class |

What did we do in the 1st marble drop experiment? | We found the times from PA to PB, at PA and at PB as well as the speed at PA and PB with a measured fall distance of 5-75 cm in 5 cm increments. We then graphed and analyzed the data. Also, we learned how to predict speed based on time |

What did we do in the 2nd marble drop experiment? | TBD |

Displacement | Displacement is how much an object has moved from its original position "How far out of place an object is" |

Distance | Distance is how much ground an object has covered, or how far it moved (mm, cm, m, km) (in, ft, yrd, mi) |

Time | How long something took to happen. (multiples/divisions of sec, minute, hour) |

Variables | A variable is any trait, factor, or condition that can exist in differing amounts or types |

Define: - Mean - Median - Mode - Range | - Add up all numbers, and divide by the number of numbers - The number in the middle of the organized list lowest to highest - The number that appears most often - The smallest value subtracted by the largest value |

Hypothesis | A supposed explanation or answer to a question that prompts further investigation or experimentation, and is the start of a lab |

The two types of graphs; name | SPEED VS TIME DISTANCE VS TIME |

Percent difference/ percent change | Percent increase and percent decrease are measures of percent change, which is the extent to which a variable gains or loses intensity, magnitude, extent, or value. |

How to find percent difference | % = (difference of the values) / (average of the values) x 100 |

Instantaneous speed | Instantaneous speed is the speed of an object at any instant |

Average speed | Average speed is the total distance covered, divided by the time interval |

Independent Variable | The variable that changes or is changed in the experiment There can only be one per experiment |

Dependent Variable | The variable that is affected by the independent variable Your data |

Constant Variable | The variable(s) that stays the same throughout the experiment |

what did we learn in the 2nd car ramp experiment? | The more weights put on the car, the faster the car's time from PA to PB |

what did we do in the 2nd car ramp experiment? | Our group tested the car's travel time from PA to PB with 0, 1, 2, or 3 200g weights on the car |