A car is towing a trailer along a straight horizontal road by means of a horizontal tow-rope. The mass of the car is 1800 kg. The mass of the trailer is 900 kg. The car and the trailer are modelled as particles and the tow-rope as a light inextensible string. The resistances to motion of the car and the trailer are assumed to be constant and of magnitude 810 N and 360 N respectively. The driving force on the car, due to its engine, is 3060 N.
State how you have used the assumption that the car and trailer are modelled as particles.
182 exam-style questions on Edexcel A Level Maths Forces and Motion, covering 10.1 Force Diagrams, 10.2 Forces as Vectors, 10.3 Forces and Acceleration, 10.4 Motion in 2 Dimensions, 10.5 Connected Particles, and 10.6 Pulleys. Each one has a worked solution and a mark scheme showing where the marks go.