haruspex said:When landing, you need to change your momentum. What is the relationship between force, time, and change in momentum?
What is the difference between landing with legs straight and landing with them bent (and not held too rigidly) in terms of how forces change over time? Try to sketch a graph. What must the two graphs have in common?
AnTiFreeze3 said:With regards to the second part, you should make sure that you understand Newton's Second Law. More force acting upon a falling body is worse, whereas less force would be better, but how would bending your legs affect that force? Knowing the definitions of each component of F=ma should hopefully make the answer apparent.
eternalronin said:Force is equal to rate of change in momentum? f=dp/dt I think. Well I don't know, do bent knees absorb force more? I'll try and draw graphs, thanks
I'm not sure how bending your knees would change the force. Would it decrease it? And since mass stays constant, acceleration would decrease?
haruspex said:If you don't bend your knees it could hurt - why do you think that is?
Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means that the greater the force applied to an object, the greater its acceleration will be, and the more massive the object, the less it will accelerate.
When jumping from a height, Newton's second law applies because the force of gravity is acting on the person, causing them to accelerate towards the ground. The force of gravity is equal to the person's mass multiplied by the acceleration due to gravity (9.8 m/s^2). As the person falls, they also experience air resistance, which can affect their acceleration.
According to Newton's second law, mass and acceleration have an inverse relationship. This means that the more massive an object is, the less it will accelerate when a force is applied to it. In the case of jumping from a height, a person with a larger mass will not jump as high as a person with a smaller mass, given the same amount of force applied.
Force is directly proportional to acceleration, according to Newton's second law. This means that the greater the force applied to an object, the greater its acceleration will be. In the case of jumping from a height, the force of the person pushing off the ground contributes to their upward acceleration, allowing them to jump higher.
Other factors that can affect a person's jump from a height include air resistance, which can reduce the person's acceleration, and the person's technique and strength, which can determine the direction and strength of the force applied. Additionally, external forces such as wind or the surface of the ground can also play a role in the person's jump.