Yeah i have the same doubt. It is not given in the Physics guide. Should we teach that to students?
B5 practical: Kirchhoff's laws (Geogebra and PhET)Hi Dilip. You are absolutely right that an elastic band does not have a constant spring constant (hence the "if" in the second sentence of the theory). If x is controlled to be over quite a small range, then R can still vary significantly...
A3 practical: Range of a rubber bandHi. I am about to try out this practical. However, I see a problem. An elastic band does not behave like an ideal spring. As it is stretched and relaxed it suffers hysterisis. Therefore it doesn't obey Hooke's law and there is not a constant...
A3 practical: Range of a rubber bandThanks for the comment. I think this is still a fair question without the mass of the man as it needs students to decide whether the best estimate for the mass of a man is 1 kg, 10 kg, 100 kg or 1000 kg. Although orders of magnitude are...
A2 MCQs: ForcesIn question 3, mass of the man is not given
A2 MCQs: ForcesThanks Stephen. I don't know if there's much our editor can do at this stage. Chris and I did get access to a provisional page layout before things went to press; clearly we and our Pearson reviewers could have positioned things better!
Teach: MomentumThanks Emma, I see what you mean now. Both the Fg and the FN are acting on the Earth (as it says in the Figure description) and we know what they are from the third law. Not (as I read) that they are the third law forces Fg on the Earth and...
Teach: MomentumHi Stephen, well spotted! It's not a printing error as the Figure specifies that forces on the earth are shown. However, you need to look back at the previous page (final paragraph) to see any reference to FN.
Teach: MomentumUndoubtedly the new rules have increased the average length of the IAs in Physics and often this means they are they are less succinct.
Thoughts from a moderator’s desk
Tim
Site authorThe syllabus is so full that most teachers find they don't have time to go beyond which is, of course, a shame. It can get translated into the students thinking that learning Physics facts are the most important thing they have...
B5 practical: Kirchhoff's laws (Geogebra and PhET)