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Gravity is causes a number of forces in the structure of ropes and posts.
Several variables can be manipulated. On the basis of the simulation, students are asked to reason about the forces in a structure. A Java Applet from the University in Toronto demonstrating the motion of a projectile subject to gravitation and air friction. The user may set launch angle, friction and initial velocity. The total time, max hight, position at top and the range is measured and viewed.