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| 5325540165 | Net Force | net force is the remaining force that produces any acceleration of an object when all opposing forces have been canceled out. Opposing forces decrease the effect of acceleration, lowering the net force of acceleration acting on an object reference.com |  | 0 |
| 5325543514 | Tension | the pulling force transmitted axially by means of a string, cable, chain, or similar one-dimensional continuous object, or by each end of a rod, truss member, or similar three-dimensional object reference.com |  | 1 |
| 5325543525 | Weight | the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg http://hyperphysics.phy-astr.gsu.edu/hbase/mass.html |  | 2 |
| 5325548315 | Frictional Force | a force that is created whenever two surfaces move or try to move across each other. Friction always opposes the motion or attempted motion of one surface across another surface. Friction is dependant on the texture of both surfaces. http://regentsprep.org/REGENTS/PHYSICS/PHYS01/FRICTION/DEFAULT.HTM |  | 3 |
| 5325548316 | Normal Force | the support force exerted upon an object that is in contact with another stable object http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Types-of-Forces |  | 4 |
| 5325552758 | Centripetal Force | a force that pulls an object moving in a circular path toward the center of its path http://www.merriam-webster.com/dictionary/centripetal%20force |  | 5 |
| 5325552759 | Spring Force | the force exerted by a compressed or stretched spring upon any object that is attached to it. An object that compresses or stretches a spring is always acted upon by a force that restores the object to its rest or equilibrium position. http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Types-of-Forces |  | 6 |
| 5325558519 | Air Resistance Force | the frictional force air exerts against a moving object. As an object moves, air resistance slows it down. The faster the object's motion, the greater the air resistance exerted against it. http://kids.britannica.com/comptons/article-311830/force |  | 7 |
| 5325558520 | Applied Force | a force that is applied to an object by a person or another object. If a person is pushing a desk across the room, then there is an applied force acting upon the object. The applied force is the force exerted on the desk by the person. http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Types-of-Forces |  | 8 |
| 5325564430 | Free Body Diagram | diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation. A free-body diagram is a special example of the vector diagrams that were discussed in an earlier unit. http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Drawing-Free-Body-Diagrams |  | 9 |
| 5456175281 | coefficient of friction | the ratio between the force necessary to move one surface horizontally over another and the pressure between the two surfaces google.com |  | 10 |
| 5456189314 | static friction | the friction that exists between a stationary object and the surface on which it's resting physicsclassroom.com |  | 11 |
| 5456202043 | kinetic friction | the amount of retarding force between two objects that are moving relative to each other. physicsclassroom.com |  | 12 |
