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Gravity pulls the chair downward, causing it to stay grounded and not float away. It also affects the weight of the chair, as the force of gravity acting on the chair creates the sensation of weight when someone sits on it.
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When a person lifts a chair, they use mechanical energy from their muscles that is converted into potential energy as the chair is raised against gravity. The person's muscles do work on the chair to overcome gravity, increasing the chair's potential energy.
Assuming the chair (and you) are standing on a planet, in an atmosphere (so you don't suffocate/explosively decompress), the chair will continue to be acted upon by gravity. In addition, air pressure will press upon it. In an open planetary setting, air pressure is often explained as gravity pulling the weight of the atmosphere upon the objects it envelopes.
An anti-gravity chair is designed to recline in a way that helps distribute your body weight evenly, reducing pressure on the spine and relieving muscle tension. It can promote relaxation, improve circulation, and reduce stress on the body.
The transformation energy of a person lifting a chair comes from the metabolic energy produced within the person's body, which is converted into mechanical energy to raise the chair against gravity. This energy is used to do work and overcome the force of gravity acting on the chair.
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The main forces acting on a chair are gravity, which pulls the chair downward towards the Earth, and the normal force exerted by the floor or supporting surface, which balances the force of gravity to keep the chair in place. Other forces could include friction between the chair and the floor, as well as any additional forces such as those applied by a person sitting on the chair.
Two forces: gravity and the support force (according to Newton's law) that opposes it.
Your weight pushing down on the chair is the action force. The reaction force is the force exerted by the chair that pushes up on your body
When you sit in a chair, the force exerted toward you is the normal force, which is equal in magnitude and opposite in direction to your weight. This force is what keeps you from falling through the chair due to gravity.
I am a computer program and do not have a physical form, so I do not need a chair to operate. I exist in the digital realm.