Respuesta :
Action force: push of the ski on the ground
Reaction force: normal reaction exerted by the ground on the ski
The Earth seems not to move because its acceleration is negligible, since its mass is very large
Explanation:
According to Newton's third law of motion:
"When an object A exerts a force (called action) on an object B, then object B exerts an equal and opposite force (called reaction) on object A"
When using Newton's third law, it is important to remember that the action and the reaction do not act on the same object, but on different objects (in this case, on the ski/skier and on the ground).
In this situation, we can identify the ski as object A, and the ground as object B.
The ski pushes against the ground, and this is the action force.
The reaction force, therefore, is the push exerted back from the ground on the ski (and the skier). Since there are no other forces acting in the opposite direction on the skier and the ski, as a result the skier will have a net force, and therefore will move (because he is accelerated).
The reason for which the Earth does not appear to move is that its mass is much larger than that of the skier: therefore, its acceleration will be negligible compared to that of the skier. In fact, if we call F the push exerted by the ski on the ground, then according to Newton's second law, the acceleration of the Earth is
[tex]a=\frac{F}{M}[/tex]
where M is the Earth's mass. SInce the value of M is very large, therefore, the acceleration of the Earth will be negligible.
Learn more about Newton's laws of motion:
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The skier moves but earth does not move because of large mass of the earth and its solid structure.
Why the earth can't moved?
Earth can't be moved by applying force on it because it is a very large body. It can't be moved by applying little of force so we can conclude that the skier moves but earth does not move because of large mass of the earth and its solid structure.
Learn more about earth here: https://brainly.com/question/25624188
