Center of Mass notes.

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Presentation transcript:

Center of Mass notes

7-8 Center of Mass In (a), the diver’s motion is pure translation; in (b) it is translation plus rotation. There is one point that moves in the same path a particle would take if subjected to the same force as the diver. This point is called the center of mass (CM). © 2014 Pearson Education, Inc.

7-8 Center of Mass The general motion of an object can be considered as the sum of the translational motion of the CM, plus rotational, vibrational, or other forms of motion about the CM. © 2014 Pearson Education, Inc.

7-8 Center of Mass For two particles, the center of mass lies closer to the one with the most mass: where M is the total mass. © 2014 Pearson Education, Inc.

7-8 Center of Mass The center of gravity is the point where the gravitational force can be considered to act. It is the same as the center of mass as long as the gravitational force does not vary among different parts of the object. © 2014 Pearson Education, Inc.

7-8 Center of Mass The center of gravity can be found experimentally by suspending an object from different points. The CM need not be within the actual object—a doughnut’s CM is in the center of the hole. © 2014 Pearson Education, Inc.

7-9 CM for the Human Body The x’s in the small diagram mark the CM of the listed body segments. © 2014 Pearson Education, Inc.

7-9 CM for the Human Body The location of the center of mass of the leg (circled) will depend on the position of the leg. © 2014 Pearson Education, Inc.

7-9 CM for the Human Body High jumpers have developed a technique where their CM actually passes under the bar as they go over it. This allows them to clear higher bars. © 2014 Pearson Education, Inc.

Problem 49. The distance between a carbon atom (m= 12 u) and an oxygen atom (m = 16u) in the CO molecule is 1.13 x 10-10 m. How far from the carbon atom is the center of mass of the molecule? © 2014 Pearson Education, Inc.

Problem solution

Problem 51 The CM of an empty 1250 kg car is 2.4 m behind the front of the car. How far from the front of the car will the CM be when two people sit in the front sear 2.8 m from the front of the car and three people sit in the back seat 3.9 m from the front? Assume that each person has a mass of 65.o kg.

Solution