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# MM Sci 8 force/motio

### force and motion science 8

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

The state in which one object's distance from another is changing- | motion |

A place or object used for comparison to determine if an object is in motion | Reference Point |

Rate of change in position, the distance an object moves per unit of time | speed |

A speed that does not vary | Constant Speed |

The speed of an object at one instant of time like a car speedometer or a radar gun | Instantaneous Speed |

How do you find average speed? | average speed (v) = distance (d) divided by time (t) |

The steepness of the line of a graph | Slope |

Describes both speed and direction of an object. The velocity of an object can change even if the speed of the object remain constant. | velocity |

The rate of change in velocity | acceleration |

When acceleration and velocity are in the same direction →→ | Positive acceleration |

When acceleration and velocity are in opposite directions → ← | Negative acceleration |

What is the Acceleration formula? | Acceleration (a) = (final velocity - initial velocity) divided by time a = (vf -vi) / t |

A ____ ______ on an object always changes the velocity | net force |

How is force measured? | Newtons |

Name 6 examples of force. | pushing, pulling, stretching, squeezing, bending, falling |

Net force determines whether an object ____ and in what ____. | moves, direction |

When the forces are equal in opposite directions what type of force is it? | balanced |

What does unbalanced forces do to an object's motion? | changes it |

What is the force that pulls objects towards each other? | gravity |

What 2 forces affect gravitational attraction? | mass and distance |

What 2 forces affect gravitational attraction? | mass and distance |

What number is the acceleration due to gravity? | 9.8 m/s squared |

What is the force air exerts on a moving body | air resistance or fluid friction |

What is the term for when the force of air resistance equals the weight of the object? | terminal velocity |

What is the term for anything that is thrown or shot through the air? | projectile |

A thrown object will follow a curved path because its own ____ sends it forward as gravity pulls it down. | inertia |

What is the tendency of an object to resist any change in motion? | inertia |

On what does inertia depend? | mass |

Newton's Law of motion stating that any object moving at a constant velocity keeps moving unless a net force acts on it. If an object is at rest, it stays at rest unless a net force acts on it. | 1st |

Example of which of Newton's Laws of motion? When your seat belt keeps you from flying through the windshield at a sudden stop | 1st |

Which of Newton's Laws of motion states that an object exerts a force on a second object, the second one exerts a force on the first that is equal in size and opposite in direction? | 3rd |

To every ____ force there is an equal and opposite ____. | action, reaction |

Which of Newton's Laws of Motion states that a net force action on an object causes the object to accelerate in the direction of the force. This acceleration is determined by the size of the force and the mass of the object? | 2nd |

These 3 examples illustrate which of Newton's Laws of Motion? A cannon fires, the space shuttle takes off, or you push off the wall while roller skating | 3rd |

What is it called when the total momentum of any group of objects remains the same, or is conserved unless outside forces act on the objects? | Law of Conservation of Momentum |

What does centripetal mean? | towards the center |

What keeps natural and artificial satellites in orbit? | Centripetal force |

What is the formula for Newton's 2nd law of Motion to find force? | Force (f) = Mass (m) x Acceleration (a) |

What is quantity of motion? | momentum |

Created by:
barbara_bogdanowicz