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Forces (Types of Forces - as seen in the free body diagrams, there or lots…
Forces
Types of Forces - as seen in the free body diagrams, there or lots of different forces that can act on an object
Applied force - just like it sounds, an applied force is a force that accelerates an object. For example a hand throws a ball. The applied force is the ball getting thrown by the hand.
Normal Force - a force that only affects balanced objects. For example a book resting on a table has a normal force applied to balance out the gravitational force. This way the book stays un-moving.
Frictional Force - a force that makes it harder for objects to accelerate or move across a surface. Generally it depends on the type of surface. if a book was pushed across a slippery surface, it would move faster than the same book getting pushed across a rougher surface.
Air resistance force - is the force that usually appears when an object is flying through the air, but it can also affect objects that are moving quickly, like a car. Unless it is an airborne object, there is usually other forces resisting against the objects acceleration in the opposite direction (for example friction with the ground if it is a car).
Tension force - the force that applies to an object when there is any sort of rope, string, chain, etc. involved. It is also affected by the length of the rope.
Gravitational Force - a force that weighs an object down. it is a force that will always be there as long as we are on earth.
Newtons Law's
2nd Law - states that the acceleration of an object depends on the net force which is acting on the object. The mass is also a variable that affects the objects acceleration
Forces are Balanced - when forces acting upon object are equal, the object stands still or keeps moving with the same velocity in the same direction.
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Forces are Unbalanced - when a greater force acts on an object and causes it to accelerate or slow down.
3rd Law - "For every action, there is an equal and opposite reaction". What this means is that the two forces that are acting upon the object are equal in size, and the direction of the forces are opposite.
Example: when you are walking, every time you push off the ground to accelerate forwards, the ground is pushing back onto you foot with equal force and opposite direction.
1st Law (Law of Inertia) - object in motion stays in motion unless acted on by another force. Object at rest stays at rest unless acted on by another unbalanced force.
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Free Body Diagrams - are a drawings that help show how forces are acting on an object and how the object responds.
Example: in this image you can see an object with frictional force acting upon it. This could be a book that is sliding against a slow surface, slowing down. 
Example: In this free body diagram, a car could be moving at a constant velocity.