Depends on how the force plates are used. You generate a force equal to your weight when standing still. At 1g of jump force, just enough to get all the weight off but not quite or just barely leave the ground it would measure twice your weight.

How does Ground Reaction Force apply to wheelchair tennis players that crush the balls at 100 mph?

Here is the physics. This is from my own graduate paper. Ground reaction force refers to the force exerted by the ground on a body in contact with it, in response to the force that the body exerts on the ground. When a person or an object interacts with the ground, they apply a force on the ground, and the ground exerts an equal and opposite force back on them. This reactive force generated by the ground is known as the ground reaction force. Ground reaction force creates power during movement or exercise because it provides the necessary resistance for the body to generate power and move forward. For example, when a person runs, the foot pushes off the ground, creating a force that propels the body forward. The ground reaction force pushes back on the foot, providing the necessary resistance for the person to generate power and move forward. The faster the person runs, the greater the ground reaction force, and the more power they generate. Similarly, during weightlifting exercises such as squats or deadlifts, the person pushes against the ground to lift the weight. The ground reaction force pushes back on the feet, providing the necessary resistance for the person to generate power and lift the weight. The heavier the weight, the greater the ground reaction force, and the more power is generated. In jumping, the body pushes off the ground with the legs, creating a force that propels the body upward. The ground reaction force pushes back on the feet, providing the necessary resistance for the body to generate power and jump higher. The higher the person jumps, the greater the ground reaction force, and the more power is generated. In summary, ground reaction force provides the necessary resistance for the body to generate power and move forward or lift a weight. The greater the force exerted on the ground, the greater the ground reaction force, and the more power is generated Does that answer your question?Glad your enjoying the channel. Do you have any other tennis issues that I could help with? If so let me know www.oneminutetennis.com

Listen again Steve mentions briefly (listened 3x now) that if you plant then move your body* into the ball there's more inertia into your return. It's not all from the arm a lot of heft going into the ball comes from that spring into your shot off the back foot. The only other choice is fade back which opens up the face of your racquet making you cough up a lob or error right when you need to exert force into your return. One way for your forehand is to pivot into the unit turn on your BACK foot then anchor on that foot so you can push off into the ball rather than fade. Rhublev is an excellent example 🤔

@@oneminutetennis Thank you for the detailed response, I think I understand. But my question was pertaining to the racquet which is what ultimately contacts the ball. If you are pushing off the ground, the ground propels you back and that force is transferred to the racquet, but in what form? F=ma, and the mass of the racquet is constant, so the ground reaction force is increasing the acceleration on the racquet, which is ultimately an increase in velocity or swing speed, no? In other words, how is more power (i.e. force) generated by the racquet on the ball if the swing speed is not increasing and its mass is constant? i.e. what is the ground reaction force converted into, in the racquet - ball collision if it is not a greater swing speed? How is greater force transferred if the mass is constant?

@@henrytoussant9385 Your comment was my first thought as well but I think he means to say, not that the racket isn't swinging faster, but rather that YOU aren't swinging faster. The extra energy is transferred through the body, into the racket, so its moving faster, but you aren't doing it by consciously moving your arm or shoulders faster. The stored potential energy from your legs is where the "effort" to generate speed comes from. The hard part is transferring that briefly stored energy through the hand and racket by timing the movments correctly.