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### 20 Cards in this Set

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• Back
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 What is one's Frame of Reference The background or point (assumed to be stationary) used for comparison when motion is described What's your point? Motion a change in position in a certain amount of time. The four steps to problem solving 1.) Write the formula 2.) Plug in the numbers 3.) Show the math 4.) Display the answer (circle it!) Speed The rate at which an object moves. Speed = Distance / Time s = d/t Velocity Speed in a given direction. Acceleration The rate of change in velocity Acceleration = (Final Vel. - Initial Vel.) / time A = (v[f] - v[0])/t Momentum depends upon the mass of the object and the velocity with which it is traveling Momentum = mass × velocity Force a push or a pull. Gives energy to an object, sometimes casuing it to start moving or change direction. Combining Forces: Unbalanced Forces - change the motion of an object - if standing still, then start moving | + → = → - if moving, then slow down/stop, or speed up → + → = →→ Combining Forces: Balanced Forces No change in motion → + ← = | Friction A force that opposes motion. - exists when two surfaces touch - exists because objects and their surfaces are not perfectly smooth. - Causes moving objects to slow down. Three types of friction sliding rolling fluid Amount of friction depends upon How hard the objects are pushed together by - the mass of the objects. - gravitational and other forces - surface materials - type of friction produced mass The amount of matter in an object. Newton's first law of motion An object will resist changes in motion. Newton's Second Law For a given force: F = Mass * Acceleration For a given mass: - The larger the mass, the smaller the acceleration, - The smaller the the mass, the larger the acceleration Newton's Third Law For every action, there is an equal and opposite reaction Action Force The initial (starting) push or pull Reaction Force That force that pushes or pulls back in response to the action force Weight The pull of gravity on an object.