Back to the full dot-point answer
ScotlandMathematics of MechanicsQuick questions
Force, Energy and Periodic Motion
Quick questions on Work, energy and power: the work-energy principle, conservation of energy and power - SQA Advanced Higher Mathematics of Mechanics
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is sign of friction's work?Show answer
Friction always opposes motion, so it does negative work and removes kinetic energy. Adding it as positive work reverses the energy balance.
What is q1?Show answer
A kg mass falls freely through m from rest. Use energy to find its speed (). [3 marks]
What is q2?Show answer
An engine does J of work in s. Find its average power. [2 marks]
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.