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Equations in Physics

• Kinematics
• change in Velocity, ( Vf-Vi)
• at constant acceleration there are three equations to memorize
• v(t)=Vo+at
• x(t)=Xo+Vot+.5at^2
• 2a(Xf-Xi)=V^2-Vo^2

Steps to Problem Solving

• read the problem carefully; identify objects we want to find and the time interval we will use
• draw the problem using what you know
• what equations do we have; physical models that appy
• identify starting pints
• describe your assumptions and describe the model you are building
• plug in known variables and double check units!1

Newton's First law

• an object in motion remains in straight line motion and an object at rest remains at rest relative to an intertial refernce frame unless acted on by a net force