Is the interaction between one body and another that can be considered as a "push" or "pull". For more on forces visit: http://eta.physics.uoguelph.ca                     
                                                                    
 

A particle has mass but it has a size that can be neglected.

A particle that is at rest or moving  in a straight line with constant velocity, will remain at rest or in constant velocity if it is not subjected to an unbalanced force.                                 
                                                                   
                                                                            

The net force on a particle is equal to the product of the particle's mass and the acceleration of the particle.         
                                                                   

When two particles interact, the forces that the bodies exert on each other are always equal in magnitude and opposite in direction.                                                         
                                                                  

Is a quantity that is characterized by a positive or negative number.  For example, time, mass, density, etc. are scalar quantities.                                                        
                                                                  

Is a quantity that has both magnitude and a direction.  For example, force, position, flux, etc. are vector quantities.  Vectors are often represented by arrows.  A vector's magnitude is the length of the arrow, and the direction of the vector is indicated by the angle between a reference axis and the arrow.  The sense is indicated by an arrowhead. For more visit: http://www.physics.uoguelph.ca

                                                                  

The position vector is a vector which locates a point in space relative to another point.                                                
                                                                  

Is a vector whose magnitude is equal to one. This vector is obtained by taking each coordinate of the vector and dividing it by the magnitude of the vector.                                     
                                                                  

The moment of a force about a point or axis is the measure of the tendency of the force to cause a body to rotate about the point or axis.  The moment of a force is also called torque.
                                                                  

• Review the concepts until you understand them completely, then work problems until you have an understanding of how to apply each concept.  Challenge yourself with the hard problems.

 
•  Read the problem carefully, draw free-body diagram(s)  (if necessary), keep track of units and make sure units correspond with each other , and organize the given information.  Also include the equations needed for solving the problem. 

 
• Remember just because you can work the easy problems does not mean you understand the concept fully, try some hard problems.  Rework these or similar problems before the test.