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# 0C-Changes in Forces

### Changes in Force and Motion

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

formula for force | Force = mass x acceleration |

formula for momentum | momentum = mass x velocity |

formula for speed (velocity) | speed = distance / time |

Free-Body Diagram | an illustrating showing all of the forces acting on one object |

inertia | The tendency of an object to resist a change in motion |

mass | how much matter is in an object |

momentum | The product of an object's mass and velocity (mass x velocity) |

motion | An object's change in position relative to a reference point. |

net force | The sum of all forces acting on an object |

newton | SI unit of force (N) |

Newton's First Law | an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. |

Newton's Second Law | the amount of force needed to accelerate an object is dependent on the object's mass |

qualitative | Data in the form of recorded descriptions rather than numerical measurements. |

quantitative | Data that is in numbers |

reference frame | a system that uses coordinates or background objects to establish position |

speed | The distance an object travels per unit of time |

Symbol for Applied Force | F(A) |

Symbol for Force of Magnetism | F(M) |

Symbol for Force of Static Electricity | F(S) |

Symbol for the Force of Friction | F(F) |

Symbol for the Force of Gravity | F(G) |

Symbol for the Force of Normal | F(N) |

Symbol for the Force of Tension | F(T) |

unbalanced force | forces that cause a change in motion |

velocity | Speed in a given direction |

formula for mass (using Newton’s 2nd Law) | m = f / a |

friction | the force that opposes the motion of an object |

formula for acceleration (using Newton’s 2nd Law) | a = f / m |

SI unit of acceleration | meters per second-squared (m/s2) -- (or m/s/s) |

SI unit of force | newton (N) |

SI unit of mass | kilogram (kg) |

balanced forces | Forces in opposite direction with the same magnitude |

acceleration | A change in motion caused by an unbalanced force |

direction | A straight path that an object ca nmove along |