Lesson 1

* Forces : is any push or pull.

* Normal Force : the support force exerted upon an object that is in contact with another stable object.

* Friction: is the force exerted by a surface as an object moves across it or makes an effort to move across it.

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* Static Friction: results when the surfaces of two objects are at rest relative to one another and a force exists on one of the objects to set it into motion relative to the other object.

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*Kinetic Friction:  results when an object slides across a surface. As an example, consider pushing a box across a floor. 

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*mass : quantity that is solely dependent upon the inertia of an object. 

*inertia:the resistance an object has to a change in its state of motion.

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Lesson 2

*Newtons First Law/ Law of Inertia:An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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*Free Body Diagram: are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.

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Lesson 3:

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*Net Force:is the vector sum of all the forces that act upon an object.

weight : 

*Newton`s second law:The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object

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Lesson 4:

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*Newton`s Third Law:the resistance an object has to a change in its state of motion.

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