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# Chapter 2

### DHS PS Ch. 2 - Motion (2015)

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

When an object changes its position relative to a reference point it is called? | Motion |

How far an object has moved from its original position is know as? | Distance |

The distance an object travels per unit of time is called? | Speed |

Any change over time is known as? | Rate |

What is the formula used to solve for speed? | s = d / t |

Speed that does NOT change over time is? | Constant speed |

Speed is usually not constant; usually an object has what kind of speed? | Changing speed |

Speed of motion when speed is changing is called? | Average speed |

The formula for finding average speed is? | Avg. Speed = total distance/total time |

The direction and speed of an object is described by its? | velocity |

This is the distance an object travels per unit of time: | speed |

The distance between an object and a reference point is the object's? | position |

The SI unit of distance is the? | meter |

The distance between the final position and the starting position and the direction is the? | displacement |

If you leave your house at 9:00 am to walk to your grandma's house 4 km away, and on your way you stop at Speedway for 15 minutes and arrive at your grandma's at 9:30 am, what was your average speed for the trip to your grandma's house? | speed = distance/time 4km/.5h = 8km/h |

If the acceleration is in the opposite direction as the velocity, the speed of the object will do what? | decrease |

Describe the motion of an object that has an acceleration of 0 m/s²? | constant motion or no change in motion |

What is the change in velocity divided by the time needed for the change to happen? | acceleration |

If the line on a speed-time graph slopes downward to the right, then acceleration is? | negative |

If a motorcycle is accelerating so that its speed is increasing what does the plotted line on a speed-time graph look like? | it slopes upward to the right |

If the acceleration is in the same direction as the velocity, the speed of the object will do what? | increase |

The horses on a carousel are moving at a constant speed but accelerate because? | the direction of the horses' motion is constantly changing |

This happens when an object's velocity decreases? | negative acceleration |

The name for the slant of a line on a graph? | slope |

Speed and direction is known as? | velocity |

The rate of change of position at a specific point in time is known as? | instantaneous speed |

If you ride a motorcycle down a straight road for 700 m then turn around and ride back to your starting position, your distance is _____ your displacement. | greater than |

The speed you read on a speedometer is called? | instantaneous speed |

15 m/s west is an example of? | velocity |

The relationship among speed, distance, and time is? | s=d/t |

A single point on a distance - time graph tells the? | instantaneous speed |

A merry-go-round horse moves at a constant speed but at a changing? | velocity |

On a speed-time graph, a line with a negative slope shows that the object is? | slowing down |

When the motion of an object is shown by a straight line on a distance vs time graph with distance on the y-axis, the slope of the line is the? | speed |

Displacement must always show? | direction |

Tommy runs in a constant direction on a straight road. The velocity vs. time graph of Tommy's motion shows a straight line with a negative slope. What does the line tell you about Tommy's speed? | it is decreasing |

When velocity changes by the same amount over each time interval, acceleration is? | constant |

On a distance vs. time graph, the line of an object at rest is a? | flat line with a slope of zero |

The difference between speed and velocity is that velocity includes? | direction |

Acceleration is defined as the change in velocity divided by? | time |

On a speed vs. time graph, constant acceleration is represented by a? | straight line |

If the acceleration is in the same direction as the velocity, the speed of the object will do what? | increase |

On a bus traveling 10 m/s South,a man stands up and walks toward the back of the bus at 1 m/s. What is the man's resultant velocity? | 9 m/s South (He is still traveling South with the bus but is walking in the opposite direction of the bus.) |

Momentum is equal to _______ times _______ . | mass, velocity |

Speed is measured in _____ . | m/s |

Distance is measured in ____ . | meters |

Time is measured in _____ . | seconds |

Momentum is measured in _____ . | kg x m/s |

Acceleration is measured in ______ . | m/s2 |

Momentum is represented by a ___ . | p |

Mass is represented by a ___ . | m |

Velocity is represented by a ___ . | v |

Time is represented by a ___ l | t |

Created by:
basmith