A crate is pulled 3.0 m along a level floor. Its kinetic energy increases by 48 J and 24 J is transferred to thermal stores by friction. What constant horizontal pulling force is applied?
16 N16\ \mathrm{N}16 N
72 N72\ \mathrm{N}72 N
8.0 N8.0\ \mathrm{N}8.0 N
24 N24\ \mathrm{N}24 N
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.