Question

Вычислите работу при равномерном перемещении на 10м санки массой 20кг, если сила трения санки о снег состовляет 0,02 часть силы тяжести санки???? Подробно плииизз

Answer 1

A=F*s
При равномерном движении сила тяги равна силе трения.
F=0,02*m*g
A=0,02*m*g*s=0,02*20*10*10=40 Дж

Answer 2

Calculation of Work

To calculate the work done during uniform motion, we need to consider the force applied and the displacement of the object. In this case, we have a sled with a mass of 20 kg and a displacement of 10 m. The force of friction between the sled and the snow is given as 0.02 times the weight of the sled.

The weight of the sled can be calculated using the formula:

Weight = mass x acceleration due to gravity

Given that the mass of the sled is 20 kg, and the acceleration due to gravity is approximately 9.8 m/s^2, we can calculate the weight of the sled:

Weight = 20 kg x 9.8 m/s^2

Now, we can calculate the force of friction acting on the sled:

Force of Friction = 0.02 x Weight

To calculate the work done, we use the formula:

Work = Force x Displacement x cos(theta)

In this case, the force acting on the sled is the force of friction, the displacement is 10 m, and theta is the angle between the force and the displacement (which is 0 degrees for a horizontal motion).

Now, let's calculate the work done:

Work = Force of Friction x Displacement x cos(0 degrees)

Substituting the values we have:

Work = (0.02 x Weight) x 10 m x cos(0 degrees)

We can now substitute the weight value we calculated earlier:

Work = (0.02 x 20 kg x 9.8 m/s^2) x 10 m x cos(0 degrees)

Simplifying the equation:

Work = (0.02 x 20 x 9.8) x 10 x 1

Calculating the numerical value:

Work = 3.92 x 10

Therefore, the work done during the sled's uniform motion over a distance of 10 m is 39.2 Joules.