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Velocity
the speed and direction of a moving object
Force
a push or a pull
Net Force
combination of all forces acting on an object
Balanced Forces
two or more forces whose effects can cancel each other out and do not change the motion of an object
Unbalanced Forces
two or more objects acting on an object that do not cancel and cause the object to accelerate
Newton’s First Law of Motion
states that if the net force acting on an object is zero the object will remain at rest or move in a straight line with a constant speed
Friction
force that acts to oppose sliding between two surfaces that are touching
Gravity
a force that exists between any two objects that have mass
Acceleration
equals the change in velocity divided by the time for the change to take place; occurs when an object speeds up, slows down, and turns
Newton’s Second Law of Motion
states that an object acted upon by a net force will accelerate in the direction of the force and that the acceleration equals the net force divided by the object’s mass
Weight
gravitational force between an object and Earth
Center of Mass
point in an object that moves as if all of the object’s mass were concentrated at that point
Note 
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