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# Physics SemesterExam

### semester A examination

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

acceleration | the rate at which velocity is changing. (includes direction) |

acceleration equation | a= change in V / change in T |

air resistance | diminishes net forces acting on an object. |

elastic collision | when objects come together and bounce off of each other |

inelastic collistion | when to objects interact and stay attached to each other after the collision. |

component | the projection of a vector quantity, as force or velocity, along an axis. |

constant | |

dependent variable | the part of data that can be changed in an experiment |

direction | the place where an object is going. |

displacement | includes direction the change in position of an object |

the equation for displacement | x final -x intial |

distance | the space between two places or object. |

units for distance | meters (m) |

duration | how long something lasts |

elliptical | referring to an oval shaped curve that is the path of a point that moves such that the sum of its distances from two fixed points is contant |

energy | the property of an object of system that enables to do work |

unit for evergy | Joules (J) |

force | an influence that accelerates an object using a push or a pull, also a vector quantity |

units for force | Newtons (N) |

free fall | motion under the influence of the gravitational force only |

friction | the force that acts to resists the relative motion (or attempted motion) of objects or materials that are in contact |

gravitational field force | a force field that exists in the space around every mass or group of masses. |

horizontally | left to right, right to left |

hypothesis | an educated guess before an experiemt |

impluse | product of force and time interval during which the force acts. |

momentum change equals | impluse * |

independent variable | the part of an equation that cannot change ex:percentages |

initial | first, starting |

investigation | searching for an answer |

joules | the unit for work and all forms of energy |

kilogram | unit of mass (kg) |

kinetic | something in motion |

kinetic energy | energy in motion |

equation for kinetic energy | 1/2mass(speed^2) |

law of conservation of momentum | in the absence of a net force, the momentum of an obeject of system is unchanged. |

magnitude | a measurement without direction(how big,long,ect.) |

mass | a measurement of ones inertia and how much matter an object has. |

momenta | plural of momentum |

momentum | the product of mass and velocity of an object has magnintude and direction (vector quantity) |

net force | the combination of all forces action on an object |

net impulse | |

newtons is used for | unit for force |

normal force | for an object resting on a horizontal surface, the upward force that balances the weight of an object. (aka supporting force) |

potential energy | energy the has the potential to create kenetic energy. ex: rollercoaster at top of hill |

equation for potential energy | mass(gravity)height |

projectile | any object that moves through the air or space, acted only by gravity, can be air resistance |

power | rate at which work is done or energy is transformed. |

equation for power | P= Work/time |

radius | from the center of a circle to the outside |

resistance | going against |

scientific notation | a number times 10 to the power of something (negative= decimal, positive=positive) ex: 2.4 x 10^4 = 24,000 |

static | |

vectors | an arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity |

velocity | speed together with the direction of motion |

vertically | up and down |

volume | space that occupies an object. |

weight | the force on a body due to gravity |

work | the product of the force on an object and the distance through which the object is moved. |

work is measure in Joules | W= Force (distance) |

Y intercept | the place on a graph where x=0 |

newtons 1st law | a force will remain constant unless acted upon an outside force |

newtons second law | F=ma law |

newtons 3rd law | each force has an equal an opposite force |