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When sitting on a chair, the action force is your weight pushing down on the chair, and the reaction force is the chair pushing back up on you with an equal force to support your weight. These forces create an equilibrium that keeps you sitting on the chair.
Force A is Gary's weight pulling him downward towards the ground. Force B is the reaction force from the ground pushing back up against Gary's feet as he rests on the ground.
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 are sitting in a chair at rest, the forces acting on you are balanced. The force of gravity pulling you downward is balanced by the normal force of the chair pushing upward against you. This balanced force keeps you stationary in the chair.
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
The reaction force to gravity is the ground pushing back up against you with an equal force to support your weight. This is known as the normal force.
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
Pushing a door open. Lifting a weight off the ground. Throwing a ball.
The reaction force to the downward push of Billy's weight on the chair is the upward force of the chair pushing back on him. The downward force of Billy's weight on Earth is countered by the upward force of gravity acting on him.
The net force applied downward to the ground is 450 newtons + W newtons. When standing still (not accelerating), the net force must be zero according to Newton's first law. This means the force pushing down must be balanced by the force pushing up (from the ground).
Newton's Third Law of motion states that every action has an equal and opposite reaction. This essentially states that if you exert a force on something, that object will exert the same force on you in the opposite direction. An example of this is you sitting at your computer now. Your weight is a force pushing down on your chair, and the chair is pushing up on you with the same force as your weight. This keeps you in one place.
Pushing a heavy object across a room requires force to overcome friction and move the object. Lifting a weight off the ground involves exerting force to counteract gravity and lift the object.