# BW-Sci Force SG Study Guide 10/26

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

A push or pull | a force |

Forces may or may not cause what? | objects to move, stop moving, or change directions |

Two forces __________________ in size and acting in _______________ directions on an object are balanced. | equalopposite |

If the force is balanced, the object stays ____________________- or continues to move at the same _______________ and in the same __________________. | the samespeedvelocity (or direction) |

An example of a balanced force | a book resting on a table |

Unbalanced force is two forces that are __________________ in size and opposite direction. | different |

Unbalanced forces causes an object to change ________________ or _______________________ or both. | motion direction |

An example of an unbalanced force | kicking a football or a car slowing down |

The overall force acting on an object | Net force |

What is the overall force acting on an object measured in? | Newtons |

A lamp sitting on a table is demonstrating Newton's _____________ law. | 1st |

A roller coaster heading down a hill is ____________________. | accelerating |

Newton's 3rd law states that for every action there is an equal and opposite __________________. | reaction |

A car traveling at 65 mph is an example of its __________________. | speed |

Newton's __________________ Law says that acceleration of an object depends on its applied force and mass. | 2nd |

If an object stays still or continues moving at the same speed and in the same direction, it is a ______________ force. | Balanced |

The earth moving plates is an example of ___________________ forces. | unbalanced |

Which of Newton's laws explain a rocket's movement during launch? | 3rd |

Sitting at the top of a steep hill on a roller coaster (not moving) is an example of | inertia |

If the mass of an object is 200kg and the applied force is 2600 N calculate acceleration. | acceleration = force divided by mass = 13 m/s/s |

If the acceleration is 600 m/s/s and the mass is 300 kg, calculate the force. | force = mass times acceleration = 180,000 N |

If the force is 2500N and the acceleration is 500 m/s.s, calculate the mass. | mass = force divided by acceleration = 5 kg |

If a soccer ball is kicked first by a second grader and then again by an eighth grader, what will be the difference in the ball's acceleration? | the eighth grader will have more force on the ball because he/she will have more mass |

If an object is moving, is that a balanced force or unbalanced force? | unbalanced |

If an object is not moving, that is a balanced force or unbalanced force? | balanced |

What can happen to the speed of an object that has an unbalanced force acts on it? | it can increase or decrease |

What can happen to the direction of an object as an unbalanced force acting on it? | it can move in the same or opposite direction as the force |

Gravity is equal to what two things? | 9.8 m/s2 and acceleration of a falling object |

If you round gravity what number is it? | 10 m/s2 |

Gravitational force determines what? | weight |

When you float in water what is acting on you? | Gravity pulling you down.Water pushing you up (buoyancy) |

Other than gravity what else acts on objects that are falling? | air resistance |

An object on earth will weigh _______________________ than it would on the moon. | more |