The difference between a cantilever chair and a normal chair is that a cantilever chair is easier movable and more flexible. The chair is however more expensive, but for the features it gives it is worth it.
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A cantilever chair has a single leg or support underneath the seat, causing it to flex and bounce when sat on. In contrast, a normal chair typically has four legs for stability. Cantilever chairs offer more flexibility and movement, while normal chairs provide more traditional support.
The following analysis holds while I am sitting in/on the chair: Gravitational force -- downward Resistance force of the chair -- upward Sum of the forces on the seat of my pants -- Zero Therefore neither I nor the seat of my pants is accelerated.
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.
To weigh a chair, you would first need a scale. Place the chair on the scale and take note of the weight displayed. If the chair is too large for the scale, you may need to weigh it in parts and add the weights together.
Two forces: gravity and the support force (according to Newton's law) that opposes it.
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.