A student wrote three statements about energy and work.
Statement 1: When a car brakes, its kinetic energy is destroyed.
Statement 2: Work done is measured in newtons.
Statement 3: A force always does work on an object.
Explain why Statement 1 is wrong.
Write a corrected version of Statement 2.
Explain why Statement 3 is wrong.
Give an example in your answer.
Another student calculates the work done when a force of 25 N moves a box 0.40 m in the direction of the force.
The student writes:
'work done =25÷0.40=62.5 J= 25 \div 0.40 = 62.5\ \text{J}=25÷0.40=62.5 J'
Calculate the correct work done.
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.