# Notes Sheet - Forces Friction acts against a motion in the...

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Forces Friction - acts against a motion in the opposite direction of normal force. Static Friction -always positive, between objects not yet in motion. It exerts force on your feet in the direction of your motion. Kinetic Friction - between objects in motion. Vectors and Scalars Length of arrow denotes magnitude. Orientation denotes direction. Operations - v + v = v s*v = v Dot product - v*v = s -The scalar product measures the colinearity of 2 vectors, which is how much one lies along the other. Parallel: AB, Anti-Parallel: -AB, Perpendicular: 0 Cross product - v x v = v The cross product measures the perpendicularity of 2 vectors. -Right-hand rule -Into and out of the page Parallel: 0, Anti-Parallel: 0, Perpendicular: AB Unit Vectors- <1,1,1> Dot product of two unit vectors = 1 Dot product of unit vector and vector A= 0 Cross product of two unit vectors = 0 Cross product of unit and vector A= B Vector Components Uniform Circular motion - when a particle moves in a circle at a constant speed.

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