click below

click below

Normal Size Small Size show me how

# the physics language

### Vectors quantities, units of measurement, variable representation, mass vs weigh

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

If the unit of measurement is a Newton ,(N), what quantity does it represent? (give name & symbol) | Force, symbol: F |

If the unit of measurement is the kilogram, (kg), what quantity does it represent? (give name & symbol) | mass, symbol: m |

If the unit of measurement is meters per second squared, (m/s2), what quantity does it represent? (give name & symbol) | acceleration, symbol: a |

If the unit of measurement is the meter (m), what quantity does it represent? (give name & symbol) | distance or displacement, symbol: d |

If the unit of measurement is meters per second, (m/s), what quantity does it represent? (give name & symbol) | speed or velocity, symbol: v |

What two characteristics define a vector quantity? | magnitude (size) and direction |

Which is a vector quantity? (choose all that apply) a) acceleration b) speed c) velocity d) distance e) displacement f) weight g) mass | a)acceleration, c)velocity, e)displacement, f)weight |

In 1969, Neil Armstrong (wearing a spacesuit) had a mass of 163 kilograms. When Armstrong landed on the moon (g = 1.6 m/s2), what was his mass (w/spacesuit on)? a) 260.8 Newtons b) 260. 8 kilograms c) 163 kilograms d) 1599 Newtons | c) 163 kilograms! explanation: his mass doesn't change on the moon! (but his weight is equal to 260.8 Newtons on moon, and 1599 Newtons on earth!) |

Symbol: Ft | tension force (measured in N) |

symbol: Fg | weight or force of gravity (measures in N) |

symbol: m | mass (measured in kg) |

symbol: Fnet | resultant force, net force, or unbalanced force (measured in N) |

symbol: a | acceleration |

symbol: Fn | normal force: the force exerted from a surface, perpendicular to the surface. |

If a plane is flying overhead at constant altitude and a constant speed, how does the forward thrust force from the engines compare to the backward drag force? | they are the same, since the plane is in equilibrium (it's moving at constant speed) |