After thousands of Physical Sciences lessons, the same mistakes appear again and again. The good news: each one has a specific, learnable fix.
1. Formula-hunting instead of physics
Weak students scan the data sheet for a formula containing the given symbols. Strong students first ask "what is physically happening?" Fix: start every problem with a sketch and a one-line statement of the principle (conservation of energy, Newton’s second law) before touching a formula.
2. Sign convention chaos
Choose a positive direction, write it down, and keep it for the whole problem. Half of all projectile and momentum errors are sign errors.
3. Skipping the free-body diagram
If forces are involved, draw the diagram — every force, correct directions, nothing invented. Marks are awarded for it, and the diagram catches the "forgot friction" class of error before it propagates.
4–5. Units and rounding
Convert everything to SI units before substituting (grams and centimetres are the classic killers), and round only at the end — carrying rounded intermediates loses accuracy marks.
6. Memorising solutions, not methods
Past papers help only if you redo the problems cold days later. Recognising a solution is not the same as producing one.
7. Ignoring the verbs
"Define", "state", "explain" and "calculate" earn marks differently. Answer what is asked — a beautiful calculation scores zero against a "define" question.