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# Motion and Forces #1

### Speed, velocity, acceleration

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

If the force acting upon an object increases, what happens to the object's acceleration? | The acceleration will also increase. |

How does the mass of an object affect its acceleration? | If the force is constant, the greater the mass, the less the acceleration. |

What force keeps an object moving in a circle? | Centripetal force |

In what direction does centripetal force act? | Toward the center of the circle |

What force is needed to accelerate an object 5 m/s/s if the object has a mass of 10 kg? | A force of 50 newtons is needed. |

A girl pulls a wheeled backpack with a force of 3 N. If the backpack has a mass of 6 kg, what is its acceleration? | .5 m/s/s |

A boy pushes a shopping cart with a force of 10 N, and the cart accelerates 1 m/s/s. What is the mass of the cart? | 10 kg |

Explain the difference between balanced and unbalanced forces. | Balanced forces do not change an object's motion; unbalanced forces do change an object's motion. |

What is inertia? | Inertia is an object's resistance to a change in it's motion. |

How is the inertia of an object related to its mass? | Inertia is equal to the mass of an object. |

State Newton's First Law of Motion. | An object at rest will remain at rest, and an object in motion will remain in motion with the same velocity, unless acted upon by an unbalanced force. |

State Newton's Second Law of Motion. | The acceleration of an object increases with increased force, and decreases with increased mass. |

State Newton's Third Law of Motion. | For every action there is an equal but opposite reaction. |

What is the definition of force? | A push or a pull |

What is net force? | The overall force acting on an object when all the forces are combined. |

What is position? | The location of an object or place |

What is a reference point? | A location to which you compare other locations |

What is motion? | The change in position over time |

What is speed? | A measure of how fast something moves or the distance it moves, in a given amount of time |

How is speed calculated? | Speed = distance/time |

If you travel 100 m in 50 s, what is your speed? | 2m/s |

What is velocity? | Speed in a specific direction |

What is a vector? | A quantity that has both size and direction |

Give 2 examples of a vector. | velocity, acceleration, force |

What is acceleration? | The rate at which velocity changes with time |

Name 3 ways that an object can accelerate. | speeding up, slowing down, or changing direction |

How is acceleration calculated? | Acceleration = final velocity - initial velocity / time |

What is the standard unit for acceleration? | meter per square second |

What is the standard unit of mass in the metric system? | the kilogram |

How is weight different than mass? | Weight depends on location. Mass is constant. |

If you weighed 60 pounds on Earth, what would you weigh on the moon? | 10 pounds |

What is the correct order of the technological design process? | Identify the challenge, propose designs, choose a design, build it, test the product, evaluate it |

What is the standard unit of weight in the metric system? | The newton |

Created by:
robertalafontaine