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# Unit 2: Kinematics

### Physics 11

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

Displacement | the distance between the initial and final position |

Speed | the rate of change of distance with time |

Velocity | the rate of change of displacement with time |

Acceleration | the rate of change of velocity with time |

Instantaneous Velocity | velocity of an object at a particular moment in time |

Newton's 1st Law | an object continues in uniform motion in a straight line unless a force acts |

Newton's 2nd Law | force= mass x acceleration (the rate of change of momentum) |

Newton's 3rd Law | for every action there is an equal and opposite reaction |

Translational Equilibrium | no resultant force in any direction |

Impulse | change of momentum |

The law of conservation of linear momentum | in an isolated system, momentum remains constant |

Work | force x distance moved in the direction of the force |

The principle of the conservation of energy | energy cannot be made of destroyed, only changed from one form to another |

Inelastic Collision | when there is a change in kinetic energy |

Elastic Collision | when there is no changed of kinetic energy |

Power | is the rate at which energy is transferred |

Efficiency | the ratio of useful energy to the energy transferred |