Question

По горизонтальной поверхности асфальтированной дороги равно- мерно движется традиционный велосипед. Какие силы действуют на велосипед? Какая сила приводит его в движение? Ответ пояснить ри- сунком. Помогите плиз ДАЮ 30 баллов.

Answer 1

Прив в движ сила трения покоя меж шиной и дорогой

Answer 2

Forces Acting on a Bicycle on a Horizontal Road Surface

When a traditional bicycle moves along a horizontal, paved road surface, several forces come into play. These forces include:

1. Gravity: Gravity is the force that pulls objects towards the center of the Earth. It acts vertically downward and affects the weight of the bicycle and the rider. The force of gravity helps keep the bicycle and the rider in contact with the road surface.

2. Normal Force: The normal force is the force exerted by a surface to support the weight of an object resting on it. In the case of a bicycle on a horizontal road, the normal force acts perpendicular to the road surface and counteracts the force of gravity. It prevents the bicycle from sinking into the road.

3. Friction: Friction is the force that opposes the motion of an object when it comes into contact with another surface. In the case of a bicycle on a road, there are two types of friction at play:

- Rolling Friction: Rolling friction occurs between the tires of the bicycle and the road surface. It allows the bicycle to move forward by providing traction and preventing slipping. Rolling friction is generally lower than sliding friction, making it more efficient for the bicycle to move. - Air Resistance: Air resistance, also known as drag, is the force exerted by the air on a moving object. It acts in the opposite direction to the motion of the bicycle and increases with speed. Air resistance can affect the speed and efficiency of the bicycle.

Force that Propels the Bicycle Forward

The force that propels the bicycle forward is the force applied by the rider on the pedals. When the rider pushes down on the pedals, the force is transmitted through the chain and gears, ultimately causing the rear wheel to rotate. This rotational motion of the rear wheel generates a force that propels the bicycle forward.

The force applied by the rider on the pedals is a combination of muscular force and mechanical advantage provided by the bicycle's gearing system. The rider's leg muscles generate the force, and the gears amplify it, allowing the rider to exert more force on the pedals with less effort.

Here is a simplified diagram illustrating the forces acting on a bicycle on a horizontal road surface:


Please note that the diagram is for illustrative purposes only and may not be to scale.

I hope this explanation helps! Let me know if you have any further questions.