TAILIEUCHUNG - Introduction To Statics And Dynamics P2

The dot product is used to project a vector in a given direction, to reduce a vector to components, to reduce vector equations to scalar equations, to define work and power, and to help solve geometry problems. | . The dot product of two vectors 23 The dot product of two vectors The dot product is used to project a vector in a given direction to reduce a vector to components to reduce vector equations to scalar equations to define work and power and to help solve geometry problems. The dot product of two vectors A and B is written A B pronounced A dot B . The dot product of A and B is the product of the magnitudes of the two vectors times a number that expresses the degree to which A and B are parallel cos 0AB where 0AB is the angle between A and B. That is Figure The dot product of A and B is a scalar and so is not easily drawn. It is given by A B AB cos 0ab which is A times the projection of B in the A direction and also B times the projection of A in the B direction. A B d AL Bj cos 0AB which is sometimes written more concisely as A B AB cos 0. One special case is when cos 0AB 1 A and B are parallel and A B AB. Another is when cos 0AB 0 A and B are perpendicular and A B 0. The dot product of two vectors is a scalar. So the dot product is sometimes called the scalar product. Using the geometric definition of dot product and the rules for vector addition we have already discussed you can convince yourself of or believe the following properties of dot products. A B B A a A B A aB a A B A B C A B A C A B 0 if A B A B A B if A B commutative law AB cos 0 BA cos 0 a distributive law aA B cos0 A aB cos0 another distributive law the projection of B C onto A is the sum of the two separate projections perpendicular vectors have zero for a dot product AB cos n 2 0 parallel vectors have the product of their magnitudes for a dot product AB cos0 AB. In particular A A A2 or A VA A If you don t know almost without a thought that cos0 1 cos n 2 0 sin0 0 and sin n 2 1 now is as good a time as any to draw as many triangles and unit circles as it takes to cement these special cases into your head. Ï- r Ï J J k k 1 j j k k Ï 0 The standard base vectors used with cartesian .

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