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# Sciencexams

### Finals

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

What is the difference between speed and velocity? | Velocity includes direction, while speed does not. |

What are the definitions of net force, balanced force, and unbalanced force? | Net force = two or more forces acting on an object at the same time A balanced force = two forces that cancel each other out Unbalanced force = two forces are acting on an object in opposite directions with unequal force |

What are Newton's three laws and what do they mean? | 1) An object will remain at its constant velocity unless acted upon by an outside force 2)F = MA 3)For every action, there is an equal and opposite reaction |

What are the equations of speed and velocity? | Speed = distance/time Velocity = speed + direction |

What is the equation for acceleration? Be able to use it in a word problem. | Acceleration = Final v- initial v divided by time A car goes around the track going 80mph N In 5 sec. it speeds up to 95mph and turns E. What is its acceleration? (3miles/hour east) |

What is friction and how does it affect objects? | Friction is a force that opposes motion between two surfaces that are in contact. It exerts force on both objects either moving or stationery, providing a net force which slows down the object. |

What is the difference between weight and mass? Would you weigh more on Saturn or Earth? | Mass = the amount of matter that makes up an object Weight = the measure of the gravitational force exerted on an object Saturn's gravitational force is larger, so you would weigh more over there. |

What does the Law of Conservation State? How is it related to roller coasters? | The Law of Conservation states that energy cannot be created or destroyed. In a roller coaster, the energy of the cars going downhill is transferred to heat from friction between the track and the cars. |

KE = 1/2 x 4kg x 3m/s squared | KE = 18J |

Work = f x d W = 55N x 4m | W = 220J |

What are the three kinds of heat? Give an example of each. | Conduction (roasting a marshmellow), Convection (magma in Earth's asthenosphere), and Radiation (sunshine) |

Created by:
Zyna