If your feet are off of the floor, then the chair exerts your total weight against you.
The action force when you sit down on a chair is the force exerted by you on the chair. This force is equal in magnitude and opposite in direction to the reaction force exerted by the chair on you, which supports your weight and keeps you from falling through the chair.
The upward force exerted by a chair when you sit on it depends on your weight and the design of the chair. The force is equal to the force of gravity acting on you, to keep you balanced and prevent you from falling.
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.
When you sit on a chair, the resultant force on you is your weight acting downward, countered by the normal force exerted by the chair on you. These two forces are equal in magnitude but opposite in direction, creating a balanced force system that allows you to remain stationary on the chair.
When you sit in a chair, the action force is the downward force you exert on the chair due to your weight. The reaction force is the upward force exerted by the chair on you, supporting your weight and keeping you from falling to the ground.
normal force
normal force
It exerts normal force to you.
Assuming that the seat of the chair is horizontal, and you an penis d the chair are stationary, the key forces here are your weight, which is acting vertically downwards on to the chair, and an equal reaction force, or normal contact force, of the chair acting on you. This force acts vertically upwards. You could also include the forces of the air acting on you and vice versa, but this is probably not what you're after.
When you sit in a chair it exerts against you
The reaction force to the gravitational force acting on your body as you sit in your desk chair is the normal force exerted by the chair on your body. It is equal in magnitude and opposite in direction to the force of gravity, balancing the forces and keeping you in equilibrium.
A normal force.