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attractive force any two objects that depends on the masses of the objects and the distance between them
1. an object at rest willl stay at rest, and an object in motion will stay in motion at constant velocity unless acted upon by an unbalanced force 2. force = massXacceleration 3. for every action there is an equal and opposite reaction
2 or more forces exerted on an object that cancel each other out and don't cause a change in motion
2 or more forces that effects don't cancel each other out and cause a change in motion
Newton's First Law
a moving object moves in a straight line with constant speed unless an unbalanced force acts on it
how to keep object moving when friction is acting upon it
you have to keep pushing or pulling on the object to overcome the frictional force
size of friction force depends on what?
1. 2 surfaces involved
2. The rougher surfaces are, the greater the friction.
Newton's Second Law
if an object is acted upon by a net force, the acceleration of the object will be in the in the direction of the net force, and the acceleration equals the net force divided by the mass.
Newton's Third Law
for every action, there is an equal and opposite reaction, or when one object exerts a force on a 2nd object, the 2nd object exerts equal force in the opposite direction on the first object.
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