Using only these forces: But not these forces: • Gravity • Normal • Kinetic friction • Static friction • Tension • Spring • Thrust • Drag • Electric • Magnetic • Weak nuclear • Strong nuclear List the forces and their directions and draw a free body diagram (FBD) for each of the following: a. An ice hockey puck gliding across frictionless ice. b. A ball in free fall. c. A block sitting on the floor being pushed horizontally to the right by a compressed spring. d. A carriage that is being pulled by a horse. e. A horse that is pulling a carriage.

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.