A box is pulled 2.5 m up a ramp at constant speed. The pulling force is 60 N along the ramp. The gravitational energy store increases by 110 J. The remaining transferred energy increases thermal stores. What is the increase in thermal stores?
40 J40\ \mathrm{J}40 J
260 J260\ \mathrm{J}260 J
50 J50\ \mathrm{J}50 J
150 J150\ \mathrm{J}150 J
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.