A student performs an experiment in which a fan unit is mounted on a cart that also has a friction pad attachment rubbing on the track beneath it. When the sludent turns the fan unit on she finas that une cart does not move so she gives a quick shove to start it moving along the track. Which of the force diagrams below could represent the forces acting on the cart just after her quick shove (not during the shove)? Fig. 6: Force exerted on cart by hand Frictional force exerted on cart by track A. Force exerted on cart by far Force exerted on cart by hand B. Force exerted on cart by fan Frictional force exerted on cart by track C. Force exerted on Frictional force exerted on cart by track cart by fan Frictional force exerted on cart by track D. Force exerted on

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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.