# A trolley with a mass of m = 340 kg moves along horizontal rails with an acceleration, the modulus of which

**A trolley with a mass of m = 340 kg moves along horizontal rails with an acceleration, the modulus of which is a = 0.15 m / s2. The modulus of the force under the action of which the trolley moves, F = 65N. Determine the modulus of the resistance to the movement of the trolley.**

According to Newton’s second law, the product of the mass of a body by its acceleration is equal to the sum of the forces acting on the body.

m * a = F1 – F2, where m is the mass of the trolley (m = 340 kg), a is the acceleration of the trolley (a = 0.15 m / s ^ 2).

F1 is the modulus of force under which the trolley moves (F1 = 65 N).

F2 – modulus of resistance to the movement of the trolley (the force is directed against the direction of movement of the trolley).

F2 = F1 – m * a = 65 – 340 * 0.15 = 65 – 51 = 14 N.

Answer: The modulus of resistance to the movement of the trolley is 14 N.