A remotely operated submersible is moving north. Its propeller provides a force of 8.0 kN8.0\ \text{kN}8.0 kN northwards and water resistance provides a force of 12.0 kN12.0\ \text{kN}12.0 kN southwards.
Calculate the resultant force acting on the submersible.
The propeller force is increased until it is equal to the water resistance. Evaluate the claim that this change will make the submersible stop.
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.