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# unit 10

### chapter 3 study guide

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

The upward force exerted on an object falling through air is | Air resistance |

When an object moves in a circular path, it accelerates toward the center of the circle as a result of | Centripetal force |

The statement "for every reaction force there is an equal and opposite reaction force" is Newtons ______ law of motion. | 3rd |

Momentum | p |

Velocity | v |

Mass | m |

Force | f |

Acceleration | a |

Momentum | kg*mls |

Velocity | mls |

Mass | kg |

Force | n |

Acceleration | mls2 |

An object that appears to be "weightless" is actually in | Free fall |

Newton's 2nd law explains the relationship between_____,_____&__________ | Mass, force, and acceleration |

A piece of paper and a penny will not fall at the same rate because of | Air resistance |

In the absence of air, a marble and a bowling ball would fall at | The same rate. |

The amount of gravitational force between objects depends on their______ and the ________________________ | Masses and the distance between them |

The path of a projectile is | Curved |

If a 100-N action force is exerted to the left, the reaction force will be ____N to the_____. | 100, right |

Acceleration due to gravity is | 9.8 mls2 |

A bowling ball has more momentum than a baseball moving the same speed because | The bowling balls mass is greater than the baseball. |

Formula for Newton's 2nd law | F=ma |

Friction between two moving objects is____. Friction between two objects at rest is ______ | Sliding, static |

A car rounding a curve is subject to ______ force. | Centripetal |

The downward force exerted on objects due to gravity is called | Weight |

As objects move farther apart, the force of gravity | Decreases |

_____is constant no matter where you are in the universe;_____varies with the gravitational pull. | Mass, weight |

When air resistance balances the weight of an object that is falling, the velocity | Remains constant |

__________occurs when gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating. | Terminal velocity |

Any object thrown through the air is a | Projectile |

Mass is a measure of the amount of ____ in an object. | Matter |

When the same amount of force is applied to 2 different masses, the larger mass willl be accelerated _____ the smaller mass. | Less than |

List the two factors that affect friction: | The kinds of surfaces in contact and the force is pressing the 2 surfaces together. |

If you exert a force on 500 N on a wall, what is the force the wall exerts on you? | -500 N |

As acceleration due to gravity increases, the weight of objects | Increases |

If you want to move to the right in space, which way would you throw a rock? | Left |

Acceleration due to gravity on Jupiter is 26 mls2. How much would a 2-kg rock weigh? | 52N |

If a 10-kg ball is thrown through the air at 10mls, what is the momentum of the ball? | 100kg*mls |

What is the force of an object with a mass of 10kg and an acceleration of 2mls2? | 20N |

Calculate the acceleration of 25-kg object that is moved with a force of 100N? | 4mls2 |

What is the mass of an object that is accelerating at 5mls2 when a force of 30N is exerted? | 6kg |

A 2-kg cat has a momentum of 100kg*mls. What is her velocity? | 50mls |

A cow moving at a rate of 10mls has a momentum of 2,000kg*mls. What is the cow's mass? | 200kg |

Created by:
Katwill678