Question

Сани, скатившись с горы имели у её подножия кинетическую энергию 240 Дж. Чему равна сила трения при торможении, если сани проехали по горизонтальной дороге 12м?

Answer 1

Fтрения=240Дж:12м=20

Answer 2

Calculation of Friction Force

To calculate the friction force during braking, we need to consider the kinetic energy of the sled and the distance it traveled. The formula for kinetic energy is:

Kinetic Energy (KE) = 1/2 * mass * velocity^2

Given that the kinetic energy of the sled is 240 J and it traveled a distance of 12 m on a horizontal road, we can use this information to calculate the velocity of the sled.

First, we need to find the mass of the sled. Unfortunately, the mass of the sled is not provided in the question. Therefore, we cannot calculate the exact value of the friction force without this information.

However, we can discuss the factors that affect the friction force during braking. The friction force depends on the coefficient of friction between the sled and the road surface, as well as the normal force acting on the sled. The normal force is equal to the weight of the sled, which is the product of its mass and the acceleration due to gravity (9.8 m/s^2).

The coefficient of friction depends on the nature of the surfaces in contact. Without this information, we cannot calculate the exact value of the friction force.

In summary, to calculate the friction force during braking, we need the mass of the sled and the coefficient of friction between the sled and the road surface. Without these values, we cannot provide a specific answer to the question.

Please provide the mass of the sled and the coefficient of friction if you have this information, and we will be able to calculate the friction force for you.