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# chapter 11 Motion

### motion

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

14 km represents what? | distance |

30 m/s represents what? | speed |

34 min represents what? | time |

3 m SW represents what? | displacement |

12 m/s2 NORTH represents what? | acceleration |

150 mph NW represents what? | velocity |

6 m/s2 represents what? | acceleration |

The study of energy and what it does to matter | physics |

The study of motion | mechanics |

A system of objects that are not moving with respect to one another. This needs to be established to accurately describe the motion of something. | frame of reference |

Movement in relation to a frame of reference | relative motion |

How far something has moved, or the exact length/path between 2 points | distance |

Distance and direction of something from its starting point | displacement |

A quantity that has size or magnitude only | scalar |

A quantity that has both size/magnitude and direction | vector |

A student walks 5 m N, 5 m E, and 10 m S. What is her distance? | 20 m |

A student walks 5 m N, 5 m E, and 10 m S. What is her distance? What is her displacement? | 7 m SE |

A student runs the 800 m in track, which is 2 full laps around the track. What is their distance and displacement? | distance = 800 m displacement = 0 m (finish back where started) |

The distance something travels in a certain amount of time | speed |

The distance and direction something travels in a certain amount of time | velocity |

Speed that doesn't change over time | constant speed |

The total distance traveled / total time for a trip. | average speed |

The speed at any given point in time | instantaneous speed |

Change in speed, direction, or both | acceleration |

What are some vector quantities? | displacement, velocity, and acceleration |

what are some scalar quantities? | distance, speed |

If a distance runner covers 1600 m in 280 s, what is his speed? | 5.7 m/s |

Florence Griffith-Joyner set the women's world record in the 200 m in 1988. She ran it in 21.34 s and still holds the world record today. What is her speed? | 9.3 m/s |

The max speed on many highways is 121 km/h. What distance can you travel at that speed if you went for 2 hours continuously? | 242 km |

The average tree sloth moves at a top speed of 0.743 m/s. How long would it take a sloth to "sprint" across our classroom (roughly 13 m)? | 17.5 s |

What is negative acceleration? | deceleration |

In 1970 the world record was set for drag racing. The car went from 0 to 110 m/s in 6.5 s. What was the acceleration? | 16.9 m/s2 |

A fighter jet landing on an aircraft carrier must reduce its speed from 42.5 m/s to 0 m/sin 2 seconds. What is the acceleration? | - 21.3 m/s2 (deceleration!) |

What does constant speed look like on a d vs t graph? | straight line angling up |

What does constant speed look like on a s vs t graph? | straight line across horizontal |

What does acceleration look like on a d vs t graph? | curving line up or down |

What does acceleration look like on a s vs t graph? | line or curve up or down |

What does zero speed look line on a d vs t graph? | straight line going across horizontal |

If you calculate slope of a d vs t graph, what are you finding? | speed |

If you calculate slope of a s vs t graph, what are you finding? | acceleration |

What is G force? | a measure of the force felt on your body standing still at the surface of the earth |

What causes + G forces? | rapid acceleration which pushes down on your body |

What causes - G forces? | rapid declaration which pushes up on your body |

What causes blackout on a roller coaster | too many + G forces |

What is the problem with experiencing too many - G forces | redout - blood vessels in brain bursting |

What is the term for adding two vectors like velocity | resultant vector |

If a plane is flying at 500 km/h S and the wind is blowing at 65 km/h W, what is the resultant velocity? | 504 km/h SW |

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aubiefan