Answer:
A) To advance at a constant speed.
In this case the acceleration is zero, therefore there is no net force
That it advances with a decreasing acceleration.
In this case the net force is in the opposite direction to the movement, created by the friction with the air and the nine
B) force towards the center of the circle
C) is a downward force due to the weight of the body
Step-by-step explanation:
We must analyze this exercise with the help of Newton's second law
F_net = m a
so we see that the direction of the net force and the acceleration is the same
let's analyze the situations presented
A) a straight section.
We can have three possibilities
* To advance at a constant speed.
In this case the acceleration is zero, therefore there is no net force
* I advance with increasing acceleration
In this case there is a net force in the dissection of the movement, created by the ski poles
* That it advances with a decreasing acceleration.
In this case the net force is in the opposite direction to the movement, created by the friction with the air and the nine
B) In a circular section.
In this case there must be a force towards the center of the circle
C9 In the air
In this case there is a downward force due to the weight of the body
In general, a force in the opposite direction to the movement created by friction with the air is not taken into account