To determine which values affect the net force on the skier, we need to focus on the forces acting on the skier that contribute to the net force.
1. Mass (64 kg) - The mass is a property of the skier and does not directly affect the net force by itself. Instead, it can affect the skier's acceleration through Newton's second law, [tex]\( F = ma \)[/tex], if the net force is known.
2. Weight (608 N) - The weight of the skier is the gravitational force acting downward. On a slope, this force can be broken into components, but the weight itself does not directly contribute to net force in this context.
3. Velocity (21 m/s, forward) - The velocity indicates the speed and direction of the skier but does not affect the net force directly. It can help us analyze the motion or kinetic energy, but it is not a force.
4. Force of friction between skis and snow (6 N, backward) - This is a force acting in the opposite direction of the skier's motion. It directly influences the net force by opposing the skier's movement.
5. Force of air resistance (0.5 N, backward) - Like friction, this force acts opposite to the skier's direction of motion and similarly affects the net force by resisting the skier's movement.
Given these considerations:
- The force of friction between skis and snow and the force of air resistance are direct forces acting against the motion of the skier. They contribute to the net force experienced by the skier.
Therefore, the correct values affecting the net force on the skier are the force of friction and the force of air resistance.
The correct answer is:
A. The force of friction between the skis and the snow and the force of air resistance
