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# Newton's 2nd Law

### questions

Question | Answer |
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State Newton's 2nd law in words | The acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object. |

State Newton's 2nd law in equation form | a = F/m |

In Newton's 2nd law what is a and what are its units? | a stands for acceleration and its unit is meters per second squared |

In Newton's 2nd law what is F and what are its units. | F stands for net force and its units are in newtons. |

In Newton's 2nd law what is m and its units? | m stands for mass and is always in kilograms. |

What is meant by the net force that acts on an object? | the resultant of all applied forces |

Suppose a cart is being moved by a certain net force. If a load is dumped into the cart so its mass is doubled, by how much does the acceleration change? | It will decrease by one-half. |

What does inversely related mean? | If one quantity increases, the other decreases and vice versa. |

What does directly related mean? | If one quantity increases, the other increases and vice versa. |

How is acceleration produced? | By the change in velocity over time |

How much force does a 20,000 kg rocket develop to accelerate 1 meter per second squared? | 20,000 N |

Name three ways we can obtain acceleration or a change in velocity | increasing speed, slowing down, or changing direction |

Calculate the acceleration if you push with a 20 N horizontal force on a 2 kg block on a horizontal air table with a friction force of 4 N. | 8 meters per second squared |

If a four-engine jet accelerates down the runway at 2.0 meters per second squared and one of the engines fails, how much acceleration will the other three produce? | 1.5 meters per second squared |

A rocket fired from its launching pad not only picks up speed, but its acceleration also increases significantly as firing continues. Why is this so? (Hint: About 90% of the mass of a newly launched rocket is fuel). | As the mass decreases, the acceleration increases because they are inversely related |