A motorised camera platform moves along a straight, horizontal track. Initially, a resultant force of 90 N causes the platform and its camera to accelerate at 1.5 m s-2.
An additional 15 kg of equipment is then secured to the platform. The motor provides a driving force of 180 N forwards and resistive forces total 30 N backwards.
Calculate the new acceleration of the platform.
103 exam-style questions on Edexcel GCSE Physics 2.3 Forces and Newton's laws, covering 2.3.1 Newton's first law, 2.3.2 Newton's second law, and 2.3.3 Weight and gravitational field strength. Each one has a worked solution and a mark scheme showing where the marks go.