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# What would be the differences in a FBD diagram of when an object is moving at constant speed and when an object is still, not moving?

Question #86266. Asked by kaung30. (Sep 22 07 8:49 PM)

tragic_flawed

One force that always acts on the lamp is gravity. This familiar force would accelerate the lamp downward toward the center of the earth if left unchallenged. However, when the lamp is placed on a table it does not move downward because the table holds it up. The lamp is pushing down on the table and the table is pushing up on the lamp. This pair of forces is an action-reaction pair: equal and opposite forces acting on two different objects in contact. The reaction force from the table is called the normal force because this force is oriented normal (perpendicular) to the surface of the table. The arrows representing the forces are labeled. The symbols over the labels remind us that the forces are vector quantities and that the direction in which the force is applied is important. The length of the force vector should be proportional to their magnitudes. http://cnx.org/content/m13535/latest/

 Sep 23 07, 12:25 AM

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