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Lesson 21 Newton's Laws of Motion
a push or pull
the sum of all the forces acting on an object
the tendency of an object to resist changes in motion or position
Newton's first law of motion
states that the velocity of an object will remain unchanged unless an unbalanced force acts on it
the amount of matter that makes up an object
a force that acts between two surfaces in contact with each other and that tends to oppose motion
the rate of change in an object's velocity
Newton's second law of motion
states that when a net force acts on an object, the object will accelerate in the direction of the net force
Newton's third law of motion
states that when one object exerts a force on a second object, the second object exerts a force on the first that is equal in size and opposite in direction