# A tram car weighing 20 tons slows down its movement. The coefficient of friction of wheels on rails is 0.4

**A tram car weighing 20 tons slows down its movement. The coefficient of friction of wheels on rails is 0.4. Find the resultant of all the forces applied to the car.**

In order to determine the resultant of all the forces that are applied to the car during braking, if it is known that the tram car has a weight of 20 tons, it slows down its movement. It is also known that the coefficient of friction of the wheels on the rails is 0.4, we will apply the formula to find the friction force.

The friction force that acts on the wheels when braking on the rails and is the resultant of all forces. Calculated by the formula:

Ftr = m * g * k.

Substitute known values and perform calculations:

Ftr = 20,000 * 9.81 * 0.4 = 78,480 H.

As for the force of gravity, it is balanced by the reaction of the rails.