An cyclist on an asphalt road is to make a turn about a curve. What are the forces present causing the circular motion?
The centripetal force towards the turning axis and the weight of the cyclist.
The pedaling force of the cyclist forward and the weight of the cyclist that is partially tilted.
The centripetal force and the pedaling force.
The friction of the tires and the pedaling force.
The friction of the tires and the weight of the cyclist.
The correct answer is: The centripetal force towards the turning axis and the weight of the cyclist.
The correct answer is: The centripetal force towards the turning axis and the weight of the cyclist.
When a cyclist makes a turn around a curve, there are two main forces at play - the centripetal force and the weight of the cyclist. Let's break it down:
1. Centripetal force: This force is responsible for keeping the cyclist moving in a curved path. It acts towards the center of the curve and is necessary to maintain circular motion. In this case, the force comes from the friction between the bicycle tires and the road. This force allows the cyclist to change their direction and turn around the curve.
2. Weight of the cyclist: The weight of the cyclist acts downwards towards the center of the Earth. This force, due to gravity, provides the necessary normal force between the bicycle tires and the road. The normal force is perpendicular to the road surface and counteracts the weight of the cyclist, allowing the tires to maintain contact with the road and support the weight.
The other options mentioned in your question are not applicable in this context:
- The pedaling force of the cyclist forward: While the pedaling force contributes to the motion of the cyclist, it is not directly related to the circular motion around the curve. It influences the speed and acceleration but is not directly involved in the forces causing the circular motion.
- Friction of the tires and the pedaling force: Frictional force between the tires and the road plays a role in both providing the centripetal force and transmitting the pedaling force to the road. However, the pedaling force alone is not responsible for the circular motion around the curve.
- Friction of the tires and the weight of the cyclist: While frictional force is important for providing the centripetal force, the weight of the cyclist does not contribute to the circular motion by itself. It only influences the normal force and ensures the tires' contact with the road surface.
Therefore, the correct answer is the centripetal force towards the turning axis and the weight of the cyclist.