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# BJU Physical Sci. 5

### BJU Physical Science - Ch 5

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

Law stating that for every force exerted on a system by its surroundings, the system exerts on its surroundings an equal but opposite force. | action-reaction principle |

The momentum of a rotating system, proportional to the mass of the system, the speed at which it rotates, and the distribution of the mass in relation to the axis of rotation. | angular momentum |

A force that in combination with other forces acting on the same system produces a zero net force on the system. | balanced force |

A fundamental conservation law of mechanics stating that in a system of colliding objects, the sum of their momentums before collision is equal to the sum afterward if no external forces act on the objects. | conservation of momentum |

A force that acts between systems only when one system touches another. | contact force |

A form of friction exerted by a fluid on an object moving in relation to the fluid. | drag |

The attractive or repulsive force produced by static and moving charges in atoms. | electromagnetic force |

A force exerted on a system by something in it surroundings. | external force |

The mathematical description of a field force existing in the space surrounding an object that is the source of or is susceptible to the field force. | field |

A noncontact force exerted on a susceptible object by similar objects. | field force |

A push or pull on a system. It may be a vector or scalar quantity. | force |

The condition of an object accelerated by the force of gravity alone with no other forces acting on it. It can only truly occur in a vacuum. | free fall |

A contact force that opposes the movement of objects past each other. It may be a vector or scalar quantity. | friction |

The acceleration of an object due to gravity. Earth's is 9.81 m/ss. It may be a vector or scalar quantity. | gravitational acceleration |

The force exerted by all matter on other matter; the weakest of all fundamental forces. It may be a vector or scalar quantity. | gravitational force |

The change of a system's momentum, directly proportional to the force exerted and the time interval over which the force is applied. It may be a vector or scalar quantity. | impulse |

The tendency of all matter to resist change in motion. | inertia |

Law stating that the acceleration of a system is directly proportional to the net force acting on the system and is inversely proportional to the system's mass. | law of accelerated motion |

Law stating that objects at rest remain at rest and objects in motion continue in a straight line at a constant velocity unless acted upon by a net external force. | law of inertia |

Law stating that the force of gravity between two objects is directly proportional to the products of their masses and inversely proportional to the square of the distance between the centers of mass. | law of universal gravitation |

Newton's 3 laws of motion, which define the science of dynamics and apply to all areas of mechanics. They are the law of inertia, law of accelerated motion, and the law of action-reaction. | laws of motion |

The momentum of a system moving in a straight line; a quantity equal to the product of the system's mass and velocity. It may be a vector or scalar. | linear momentum |

The condition in which all forces acting on a system are balanced as indicated by the system's lack of acceleration. | mechanical equilibrium |

A property of a moving object directly proportional to its mass and speed. | momentum |

The single unbalanced force acting on a system that is the sum of all forces acting on the system. If the forces are balanced, then the net force is zero. | net force |

The SI unit of force. In SI base it is equal to 1 kilogram meter per second per second. | newton |

The force exerted by a supporting surface on an object resting on it. The normal force is always perpendicular to the supporting surface. | normal force |

The force that holds protons and neutrons together in nuclei; the strongest of all fundamental forces. | strong nuclear force |

The maximum constant speed an object falling in the atmosphere. It occurs when drag balances the force of gravity. | terminal velocity |

A force that in combination with other forces acting on the same system results in a nonzero net force and produces a change in motion of the system. | unbalanced force |

A constant acceleration such as that of an object in free fall. | uniform acceleration |

A force exerted between elementary particles of matter within the nucleons; the third-strongest fundamental force. It is involved in some forms of nuclear decay. | weak nuclear force |

Created by:
heidio
on 2008-08-19