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.
Some forces that can act upon a moving object include friction, air resistance, gravity, and applied forces like pushing or pulling. These forces can affect the speed, direction, and motion of the object.
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.
The main forces that keep you sitting in a chair are gravity pulling you down towards the chair, and the normal force exerted by the chair pushing back up against your body to prevent you from falling through. Your body weight is distributed through these forces, keeping you stable and seated in the chair.
When you are sitting in a chair, the main forces acting on you are gravity pulling you downward towards the Earth and the normal force exerted by the chair pushing you upward to support your weight. Additionally, there may be frictional forces between you and the chair depending on the materials and surfaces involved.
If the forces aren't balanced while sitting on a chair, the chair may tip over. For example, if you lean too far to one side or exert a greater force on one side of the chair, it can destabilize the chair and cause it to fall over. It's important to distribute your weight evenly to keep the forces balanced and prevent accidents.
Tension and compression are the two forces that act upon a bridge.
Some forces that can act upon a moving object include friction, air resistance, gravity, and applied forces like pushing or pulling. These forces can affect the speed, direction, and motion of the object.
friction
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Some Forces do not involve physical contact between the bodies on which they act. -Jauan Williams 3182163642
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.
Gravity and atmospheric pressure.
Gravity hold the moon in orbit
No resultant forces act upon it
A chair you sit upon, and a table you eat upon.
Internal forces are stresses and changes inside the material or body. External forces act independently upon an object.
Gravity, Air resistence, friction and the push from the floor/table