Can someone please help me with these questions? I'm struggling.
1. A car of mass M pulls a trailer of mass m along a straight level road at constant speed. The car experiences a resistance to motion of 5000 N and the trailer feels a resistance to motion of 1000 N.
(i) Draw diagrams showing all of the forces acting on the car and on the trailer.
(ii) By considering the forces on the whole system of car and trailer, find the
driving force in the engine.
(iii) By considering the forces on the trailer only, find the tension in the towbar.
2.
In the diagram above, mass m1 lies on a rough horizontal table and is connected to masses m2 and m3, where m3 > m2, by light inextensible strings passing over smooth pulleys.
(i) Draw diagrams showing all of the forces acting on each of the masses.
(ii) Assuming that the frictional force is large enough to prevent the system from moving, find expressions for the tension in each string and the frictional force.