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# Momentum

### notes for discussion

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

Inertia in motion is called ______. | Momentum |

Write the equation for momentum. | p = mass x velocity |

In the momentum equation, what is the relationship between momentum and velocity? | They are directly related |

What is acceleration? | A change in velocity |

Name three ways velocity can change? | speeding up, slowing down, or changing direction |

What is momentum if there is no change in velocity? | Zero |

_________causes acceleration. | Force |

Velocity is speed and direction. True or False. | True |

A car is going 2 m/s north. Is this speed or velocity? Why? | It is velocity because we have both speed and direction |

Identify the following measurements as speed, velocity, or momentum: a. 88 km/h b. 10 m/s straight up c. 18 kg m/s down d. 19 m/s west | a. speed b. velocity c. momentum d. velocity |

Calculate the momentum of a 6.00 kg bowling ball moving at 10.0 m/s down the alley. | p = 6.00 kg x 10.0 m/s = 60 kg m/s down the alley |

Calculate the momentum of a 75 kg speed skater moving forward at 16 m/s. | p = 75 kg x 16 m/s = 1200 kg m/s moving forward |

Calculate the momentum of a 1.35 kg ostrich running north at 16.2 m/s. | p = 1.35 kg x 16.2 m/s = 21.9 kg m/s running north |

Describe the measurements necessary to find the average speed of a moving train. | The distance the train traveled and the time it took to travel that distance must be measured. |

Explain why knowing the velocity of an airplane is more important to a traveler than knowing only the airplane's speed. | Velocity gives the direction the plane is heading. |

_______and _______are important in changing momentum. | Force and time |

What is impulse? | Impulse is force times time |

What is the unit for impulse? | N/s |

An impulse always involves two variables. Name them. | Impact force and impact time |

Why should a golfer swing as hard as possible and follow through the swing? | By doing so, he is creating the greatest force possible for as long as possible which results in a greater impulse and greater momentum. |

Determine the units of a caterpillar's speed if you measure the distance the caterpillar travels in centimeters and the time it takes to travel this distance in minutes. | cm/minute |

Describe why your velocity changes when you ride a Ferris wheel even if the wheel turns at a constant speed. | As the Ferris wheel turns, you are moving in a different direction at each instant of time. Since the direction changes, the velocity changes. |

Describe the motion of a ball in a typical sport. Identify times when the ball moves with a constant velocity and times when its velocity changes. | If a ball moves in a straight line at a constant speed, the velocity is constant. If the ball changes direction or speed, the velocity changes. |

What is the velocity in meters per second of a sailboat that travels 149 m away from the shore in 16.8 s? | velocity = d / t = 149 m / 16.8 s = 8.87 m/s away from shore |

Created by:
william myricks
on 2011-03-04