Question

Работник, прилаживает силу 400Н,толкает вагонетку массой 0,3т. Определить силу трения что действует на вагонетку, если ускорение её движения 0,5м/с в квадрате

Answer 1

400Н/300кг = 4,33 м/с^2

4.33 - 0.5 = 0.83 м/с^2- это ускорение, которое "недобирает" тележка из-за трения.

0.83 * 300 = 250 Н - сила трения

 

Answer 2

Calculation of Frictional Force

To determine the frictional force acting on the wagon, we need to use Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and acceleration. In this case, the net force is the sum of the applied force and the frictional force.

Let's break down the given information: - Applied force (F_applied) = 400 N - Mass of the wagon (m) = 0.3 t = 300 kg - Acceleration of the wagon (a) = 0.5 m/s^2

Using Newton's second law, we can calculate the net force:

Net force (F_net) = m * a

Substituting the given values:

F_net = 300 kg * 0.5 m/s^2

F_net = 150 N

Now, we can determine the frictional force (F_friction) by subtracting the applied force from the net force:

F_friction = F_net - F_applied

F_friction = 150 N - 400 N

F_friction = -250 N

The negative sign indicates that the frictional force acts in the opposite direction to the applied force.

Therefore, the frictional force acting on the wagon is 250 N in the opposite direction of its motion.