Err, two questions related to center of gravity and friction

[YenTe]

"since the distance of forces(the center of gravity forces) from the gravity are at a very large distance so they are just like parallel forces"

now what do parallel forces have to do with distance or vice versa?
Explain.

and then please explain the friction of sand.

anyone?!

 

[radou]

Since the distance to the center of the Earth is very big (around 6300 km), all gravitational forces can be considered acting in parallel directions. For example, imagine two objects on the surface of the Earth resting close to each other, let's say one meter. If you draw a sketch, and if you connect every object with a straight line to the center of the Earth, these lines will not be parallel. But since the distance to the center of the Earth is, as mentioned, very big, these two lines can considered to be parallel, which simplifies calculations, but still keeps them in limits of satisfying accuracy.

 

[kyle8921]

I would like to clarify the concept of center of gravity and friction in relation to the questions raised. The statement that the center of gravity forces are at a large distance from the gravity is not entirely accurate. The center of gravity is the point where the weight of an object is evenly distributed and it is always located at the geometric center of an object. The force of gravity acts on the entire object, not just at a certain distance from the center of gravity.

In terms of parallel forces, the distance between them does not affect their parallel nature. Parallel forces are defined as forces acting in the same direction and not intersecting. The distance between them only affects the magnitude of the forces, not their parallel nature.

Moving on to the topic of friction, it is the force that opposes the motion of an object when it comes into contact with another surface. The friction of sand, or any other material, depends on its texture and surface area. Sand has a rough texture and a large surface area, which results in high friction. This is why it is difficult to walk on sand compared to a smooth surface like concrete.

I hope this clarifies the concepts of center of gravity, parallel forces, and friction for you. If you have any further questions, please do not hesitate to ask.