A dog sled starts pulling a 50 kg sled in the snow with a constant force of 150N.

| February 1, 2021 | education

A dog sled starts pulling a 50 kg sled in the snow with a constant force of 150N. How long will it take for the sled to travel the first 100m of the track? Sliding friction coefficient of runners on snow is 0.05.

To find the time of movement of the sleigh (dog sled), we will use the formula: S = a * t ^ 2/2, whence t = √ (2S / a) = √ (2S / (F / m)) = √ (2S * m / (Ft – Ftr)) = √ (2S * m / (Ft – μ * m * g)).

Constants and variables: S – the length of the considered part of the path (S = 100 m); m is the weight of the sleigh (m = 50 kg); Ft is the pulling force of the dog team (Ft = 150 N); μ – coefficient of friction (μ = 0.05); g – acceleration due to gravity (g ≈ 10 m / s2).

Calculation: t = √ (2 * 100 * 50 / (150 – 0.05 * 50 * 10)) = √80 = 8.94 s.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.