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# Topic 3 vocab

### Physics Vocabulary

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

Net Force | The vector sum of all concurrent forces acting on a body; an unbalanced force. |

Universal Gravitation | Newton's Law that explains that the force of attraction between any two masses is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. |

Newton's Second Law Of Motion | An unbalanced force (net force) acting on an object causes an acceleration which is directly proportional to the magnitude of the force, and which acts in the same direction as the force: F = ma. |

Dynamics | The area of physics that deals with the relationship between the forces acting upon an object and its resulting motion. |

Newton's First Law Of Motion | An object remains at rest or or in a state of uniform motion unless acted upon by an unbalanced force (a net force); also called the Law of Inertia. |

Kinetic (Sliding) Friction | The frictional force that must be overcome to keep an object in motion, for example, when one object slides against another. |

Inertia | The resistance of matter to change in its motion. Mass is a measure of inertia. The SI unit of mass is the kilogram, kg. |

Inverse Proportion | n the relationship y = 1/x, the variable y is inversely proportional to the variable x. The graph of y versus x is a rectangular hyperbola. |

Centripetal Acceleration | he acceleration experienced by an object traveling in uniform circular motion. |

Friction | A force that opposes motion as a result of contact between surfaces. |

Newton's Laws | saac Newton's three laws of motion: Inertia, Acceleration and Mass and Forces occur in pairs ( action - reaction). |

Uniform Circular M | The motion of an object at a constant speed around a circular path. |

Force | A push or pull that affects the state of motion of an object. |

Static Equilibrium | A state in which no net force (unbalanced force) acts upon an object in static equilibrium, so that the object remains at rest or moves with a constant velocity. |

Newton's Third Law Of Motion | f one object exerts a force on a second object, the second exerts a force on the first that is equal in magnitude and opposite in direction; also referred to as action-reaction. |

Inverse Square Law | A relationship in which one variable changes indirectly or inversely with the square of another variable. |

Newton (N) | The SI unit of force. One newton is the amount of force needed to accelerate a mass of one kilogram by one meter/second squared: 1 N = 1 kg·m/s2. |

Unbalanced Force | The sum total or net force on an object that produces acceleration of the object. |

Potential Energy | Energy resulting from the position or state of an object. |

Normal Force | The force perpendicular to two surfaces in contact with each other which holds the surfaces together. |

Centripetal Force | The force that causes centripetal acceleration. |

Equilibrant | A force that is equal in magnitude but opposite in direction to the resultant force. |

Concurrent Forces | Two or more forces that are acting on the same object. |

Weight | The weight of an object is the gravitational force exerted on it. |

Impulse | The change in the momentum of an object that occurs when an unbalanced force acts upon the object for a period of time. |

Coefficient Of Friction | A ratio between the force needed to overcome sliding friction and the object’s normal force pressing it to the surface. |

Coefficient Of Kinetic Friction | The ratio of the force of kinetic friction exerted on an object to the normal force acting upon it: . |

Rolling Friction | The friction that occurs when one object is rolled over another. |

Equilibrium | A condition in which there are no unbalanced forces acting on an object. |

Newton's Laws | Isaac Newton's three laws of motion: Inertia, Acceleration and Mass and Forces occur in pairs ( action - reaction). |