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# force & motion

### Newton's Laws of Motion

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

Which of Newton's Laws of Motion explains why you should always wear a seatbelt while riding in a car? | 1st Law |

Which of Newton's Laws of Motion explains how force, mass, and acceleration are all related with this formula: f = ma | 2nd Law |

Which of Newton's Laws of Motion explains how every action has an equal and opposite reaction? | 3rd Law |

Bob pushed a box with a mass of 70 kg across the floor. The acceleration of the box was 2 m/s/s. What was the force? | 140 N |

The Law of Inertia is known as which of Newton's Laws? | 1st Law |

Which has more inertia, a beach ball or a basketball? | Basketball |

When we measure force, what unit do we use to label force? | Newton |

When an object pushes or pulls another object by touching it, what kind of force is it? | Contact force |

What is the force of attraction between two masses called? | Gravity |

A force that resists motion between two surfaces that are pressed together is called... | Friction |

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

If Sally pulled with 40 N of force to the left, and Sue pulled with 50 N of force to the right, in which direction, and with what force will the object move? | 10 N, right |

Will balanced forces ever change an object's speed or direction? | No |

Is it possible to have balanced forces on a moving object? | Yes |

What is needed to change an object's motion? | an unbalanced force |

The resistance of an object to a change in the speed or the direction of its motion is called... | Inertia |

Any force that keeps an object moving in a circle is... | Centripetal |

What is the mass of a truck if it produces a force of 10,000 N while accelerating at a rate of 5 m/s/s? | 2,000 kg |

What force is required to accelerate a car at a rate of 3 m/s/s if the car has a mass of 3,000 kg? | 9,000 N |

mass x velocity = ? | momentum |

Which has more momentum, a bicycle traveling at 40 km/h, or a pickup truck traveling at 40 km/h? | pickup truck |

What is the unit used to measure acceleration? | m/s/s |

What is the unit used to measure mass? | kg |

Do heavier objects have MORE or LESS inertia? | MORE |

Which of the following parts of a car will experience the most friction: headlights, radio, windshield wipers | windshield wipers |