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### 24 Cards in this Set

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• Back
 What is velocity? The speed of an oblect in a certain direction. What is Momentum? The product (multiplacation) of the mass of an object and its velocity. What is speed? the rate in change of position What is balenced? forces on an object that are equal in size an opposite direction. What is weight? the measure of force of gravity exerted on an oject What is interia? the tendancy of an oblect to resist .... What is friction? The force that oposes motion between two surfaces that are touching each other What is acceleration? the rate of change in velocity What is force? any push or pull on an oblect what is gravity? the force of attraction between all objects in the universe What is the point of referance? The point at which an object begins to change position What is a balenced force? forces on an object that are equal in size, an opposite in direction. What is Unbalenced force? Forces that change the velocity of an object Average Speed the best way to describe speed if motion varies a great deal in an object Describe the relationship between mass and momentum the more mass, the more momentum Decribe the relationship between velocity and momentum? the more velocity, the higher the momentum Can a change in force cause a change in velocity? Yes What is the only time an object is not accelerating? when both its speed and direction are constant Do cars on an interstate going in opposite directions have the same velocity? No What two things must change in order for velocity to change? Speed, Direction Describe the relationship between gravitational pull and mass. as mass increases, gravitational pull increases Why is it that an objects weight can change but its mass cant? because the amount of space taken up cant ever change What two things determain the acceleration of an object? size of the force, the mass of an object. Describe the relationship between mass and interia As mass increases interia increases