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# Phys science chap 5

### BJU 9th physical science terms chapter 5

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

a push or pull on a system | force |

The SI unit of force | Newton |

The force that holds protons and neutrons together in nuclei; the strongest of all fundamental forces | Strong Nuclear Force |

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

the force exerted by all matter; the weakest of all fundamental forces | gravitational force |

a force that acts between systems only when one system touches another | contact 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 | field force |

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

the sum of all forces acting on a system. If the forces are balanced this is zero. | net force |

a force that produces a change in motion because the sums of the forces is not zero | unbalanced force |

the tendency of all matter to resist change in motion | inertia |

Newton's first law of motion that states 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 force | Law of Inertia |

Newton's second 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. F=ma | Law of Accelerated Motion |

Law stating that for every action there is an equal and opposite reaction | Action-Reaction Principle |

a contact force that opposes motion. It affects both moving and non-moving objects. | friction |

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

a constant acceleration, such as that of an object in free fall | uniform acceleration |

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

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

p=mV | linear momentum |

Contact forces are also called | mechanical forces |

The contact force where two things are pushed together | compression |

The contact force where two things are pulled apart | tension |

The contact forces where things are twisted | torsion |

The contact forces where things slide in opposite directions away from each other | shear |

Forces that cause things to move without touching them | field forces |

Field forces get weaker or stronger as you move away from the source? | weaker |

The field force the everything exerts but it is only noticeable with big objects like planets. | gravity |

The field force that surrounds magnets and materials with electricity flowing through them. | magnetic |

The field force that surrounds and affects electrical charges. | electricity |

Balanced forces are pushes and pulls that do this. | cancel each other out |

This means you have balanced forces. | zero net force |

Acts on a system from outside the system's boundary | external force |

When one force is greater than the other you have this. | unbalanced force |

The difference between two forces. | net force |

The gravitational attraction exerted on an object's mass. | weight |

weight is | mass being pulled down by gravity |

Formula for Newton's Law of accelerated motion | F = m*a. Force = mass * acceleration |

What makes the biggest change in the amount of gravity between two objects? | Distance |

When objects fall due to gravity alone with no other force acting on them. | Free fall |

This can slow an object down during free fall | air resistance |

The formula for weight | W = mass * gravity. W = m*g |

Acceleration at a constant rate | uniform acceleration |

Air resistance is friction from air molecules and can be called | drag |

Force is scalar or vector? | vector |

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