Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.
Understanding
- I can state the charges of the proton, electron and neutron and explain what a neutral object is. (Guide: “Charge: a property of matter”)
- I can explain why every net charge is a whole-number multiple of e, and spot an impossible charge. (Guide; Practice Q2)
- I can say when the point-charge model is reasonable and when it breaks down. (Guide: “The point-charge model”; Practice Q7d)
- I can state the direction of the electric force between like and unlike charges and explain why the two forces in a pair are equal in size. (Guide: Figure 1; Practice Q5b)
- I can describe permittivity and polarization and the difference between a conductor and an insulator. (Guide: “Permittivity and polarization”; Practice Q4)
Calculation and skills
- I can use F = k|q₁q₂|/r² with correct units and prefixes. (Guide: Worked example 1; Practice Q5)
- I can predict a new force from factors of change in charge and distance. (Guide: “Predicting changes”; Practice Q1)
- I can find the net force on a charge from two or three others by adding vector components. (Guide: Worked example 2; Practice Q3)
- I can derive the position where the net force from two fixed charges is zero. (Practice Q6)
- I can linearise force and distance data and find a charge from the slope. (Practice Q7)
Reasoning
- I can compare electric and gravitational forces between particles and explain why gravity dominates at large scales. (Guide: “Electric force versus gravitational force”; Practice Q5c, Q5d)
- I can explain that contact forces such as the normal force are electric forces between atoms, modelled in bulk. (Guide: “Everyday forces are electric underneath”)
All ticked? Move on to Topic 10.2, Conservation of Electric Charge and the Process of Charging, in the Topic 10.2 study guide, or return to the course roadmap.