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# Science Class

### motion test

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

What is a reference point? | a place or obect used for comparison to determine if something is in motion. |

What is motion? | is the state in which one objects distance from another is changing |

What is the system of measurement that help scientists from all over the world communicate? | the International System of Units (SI) |

What is a meter? | The basic SI unit of length. |

What is speed? | is the distance the object travels per unit of time. |

What is the equation for speed? | Speed=Distance/Time |

What is average speed? | the overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time. |

What is instantaneous speed? | the speed of an object at one instant of time. |

What is velocity? | the speed in a given direction |

What is a slope? | the steepness of a line on a graph |

What is the equation for slope? | Slope=Rise/Run |

What is the equation for Distance? | Distance=Speed X Time |

What is acceleration? | the rate at which velocity changes. |

In Science, what does acceleration refer to? | increasing speed, decreasing speed, or changing direction |

How do you determine the acceleration of an object? | you have to calculate the change in speed per unit of time. |

What is the equation of acceleration? | Final speed - Initial Speed/Time |

The parts of earth's outer layer that move are called? | plates |

The rate at which velocity changes is called? | acceleration |

Figure out this example: A family takes a car trip. They travel for an hour at 80 km/h and then for 2 hours at 40 km/h. Find their average speed during the trip. | Average Speed: 40 km/h |

True or False: I f a train is slowing down, it IS accelerating. | True |

True or False: To find the acceleration of an object moving in a straight line, you must calculate the change in DISTANCE during each unit of time. | False, Speed |

True or False: A Ferric wheel turning at a constant speed of 5 km/h IS NOT accelerating. | False |

True or False: An airplane is flying west at 200 km/h. Its average occeleration is 100 km/h2. | False, 50 km/h |

__________ occurs when the velocity of an object changes. | acceleration |

When you say that a race car travels northward at 100 km/h, you are talking about its _________ | velocity |

What is the equation for Time? | Time= Distance/Speed |

Example: Speed= 32m/8s= | 4 m/s |

Example: A car travels 66 kilometers in 3 hours. What is its speed? | 22 km/h |

Example: Avwerage Speed-200km/5hr | 40km/hr |

Example: Suppose a car travels 60 kilometers the first two hours and 15 kilometers the next hour. What is the cars average speed? | 25 km/h |

Example: Suppose you ride your bicycle into the countryside on a bike path. You travel 6 kilometers the first hour, 3 kilometers the second hour, and 6 kilometers the htird hours. What is your average speed for the whole ride? | 5 km/hr |

Example: Acceleration=20m/s - 4m/s/4s | 4 m/s2 |

Example: A cheetah acelerates from 2m/s to 16m/s in 7 seconds. What is the cheetahs average acceleration? | 2m/s2 |

Example: A motorcycle accelerates from rest to 31m/s in 10 seconds. Find the motorcylces average acceleration. | 3.1m/s |

Created by:
mshader