
Cartesian Vectors in 3D: Components and Direction Angles
Describe a force in 3D with i, j, k components, its magnitude, coordinate direction angles and unit vector.
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Describe a force in 3D with i, j, k components, its magnitude, coordinate direction angles and unit vector.

Write a force by its x and y components, in scalar and Cartesian vector form, and get its magnitude and direction back.

Write a cable or rope force as a Cartesian vector from the coordinates of two points, using position and unit vectors.

Add concurrent forces in space component by component and find the magnitude and direction angles of the resultant.

Use the dot product to find the angle between two lines and the parallel and perpendicular components of a force.

Add any number of coplanar forces by summing x and y components, and find an unknown force from a known resultant.

What makes force a vector, how vectors are drawn and written, and how free, sliding and fixed vectors differ.

Find the resultant of two or more forces with the parallelogram law, the triangle rule and the laws of sines and cosines.

Split a force into components along any two given directions, and see why oblique components are not projections.

Learn what mechanics studies, how it splits into statics, dynamics and other branches, and why statics comes first.

The basic quantities of statics and its three models (particle, rigid body and concentrated force), with when to use each.