How Does Lifting Objects Affect the Body's Center of Gravity?

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SUMMARY

The discussion focuses on how lifting objects, both light and heavy, affects a person's center of gravity. It is established that the body's center of gravity shifts continuously while lifting, requiring a counteracting force to maintain balance. When lifting heavier weights, the force exerted must equal the combined weight of the object and the individual to prevent falling. Newton's Third Law is applied, indicating that the ground must exert an equal force to support the individual and the lifted object.

PREREQUISITES
  • Understanding of Newton's Third Law of Motion
  • Basic knowledge of center of gravity concepts
  • Familiarity with forces acting on the human body
  • Experience with simple physics experiments
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  • Research the principles of center of gravity in biomechanics
  • Explore Newton's Laws of Motion in practical applications
  • Learn about balance and stability in physical activities
  • Conduct experiments demonstrating the effects of lifting on body mechanics
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This discussion is beneficial for students studying physics, physical education instructors, and individuals interested in understanding the biomechanics of lifting and balance.

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Homework Statement


Discuss how a person's body is affected when lifting both light and heavy objects.


Homework Equations


No equations provided.


The Attempt at a Solution


The body's centre of gravity will be shifting at every moment. (I have a really poor grasp and understanding of physics concepts and this the only answer I can come up with. Please help me!)
 
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Try drawing a stick figure lifting things, and try to arrow the forces.
 
okay. How about something more graphic? The light and heavy part. For example, more on the centre of gravity part. Thanks for your help!
 
Help! Thanks to everyone who answered, but I still do not understand!
 
In order to actually lift a heavier weight, you'll need to provide a stronger force upon that object to counteract its own weight.

Thus, at the very least, if you move it with constant velocity, it will, by Newton's 3.law, affect your arm with a force equal to its own weight.

Thus, if you are not to fall through the ground, the ground must act upon you with a force equal to the sum of your own weight and the objects weight. That force is applied to your feet, presumably.
 
Wow, that's quite the type of answers I had been looking for. Thanks!
 
Hello thanks for the help I received since, but I really need more aid!
 
hello please help me with this qn! Thanks!
 
I'll toss in an experiment you can do at home. stand erect feet slightly apart, and lift one foot off the ground. assuming you have 2 legs, not too hard. Now with your right shoulder and arm pressed against a wall so that your hips, feet and shoulders are all perpendicular to the wall. Repeat above with left and right legs? What did you notice?
 

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