It’s very important to use and spell keywords correctly! Marks cannot be given for a keyword that isn’t used or spelled incorrectly.
Q: Explain why a durian higher up in the tree will fall and land with a louder thud than a durian lower down in the tree.
Poor ans: The durian higher up will fall faster and harder and so give a louder thud.
Poor ans with mispelling: The durian higher up has greater gravititional energy…
Poor ans with wrong keyword: The durian higher up has greater gravitational force…
Correct ans: The durian higher up has greater gravitational potential energy than the durian lower down, so it lands with a louder thud.
Other common keywords to note:
gravity / gravitational
friction / frictional
Let me know if you find this useful – I’ll try to compile a more comprehensive list.