Unit 3 exam answers from Trial Exam papers-Please clarify

[musicnmaths]

I have been doing a few Unit 3 Lisachem and STAV trial exams. Examples:

If asked for say height of the lava bomb and I write 101.3m whilst the Lisachem answer is 101.25 m. Will I lose marks?

Similarly the kinetic energy of the canister answer was 337.5 J and Lisachem answer reads 340 J. Will I lose marks?

Speed of skateboard answer written as 3.38 m s whilst the STAV answer was 3.4 m s. Is my answer incorrect?

Magnitude of the friction force answer -I wrote 8.82 x 10 raised to -1 N whilst STAV answer was 0.88 N. Is my answer incorrect?

Would be happy to have your feedback. Thanks in advance.

[Stevensmay]

Depends on the question, some will ask for an exact value and others will want it to X decimal places etc.

With the first one if you had something like 405/4 and it didn't ask for rounding you would lose marks for changing it to 101.3

[silverpixeli]

I have been doing a few Unit 3 Lisachem and STAV trial exams. Examples:

If asked for say height of the lava bomb and I write 101.3m whilst the Lisachem answer is 101.25 m. Will I lose marks?

Similarly the kinetic energy of the canister answer was 337.5 J and Lisachem answer reads 340 J. Will I lose marks?

Speed of skateboard answer written as 3.38 m s whilst the STAV answer was 3.4 m s. Is my answer incorrect?

Magnitude of the friction force answer -I wrote 8.82 x 10 raised to -1 N whilst STAV answer was 0.88 N. Is my answer incorrect?

Would be happy to have your feedback. Thanks in advance.

It looks like all your answers were only different because of how much you rounded/did not round the answers. This is not something that the VCAA minds about in Physics (different story for chem though), so you wouldn't lose marks as long as you're not giving answers like 67.8235135034798 with a stupid amount of accuracy. Use your better judgement, you can probably go to 1 or 2 decimal places depending on the scale of the problem, right?

In particular, your answer is a bit tedious and I would prefer the non- scientific notation version since it's just 0.882, but I wouldn't take away a mark for it.

If you know about significant figures, you can use that as a guide. Try to leave your answers in about as much accuracy as the data given in the question. If they're giving you numbers to 2 decimal places, round your answer to 2 decimal places. etc.

[Kel9901]

I have been doing a few Unit 3 Lisachem and STAV trial exams. Examples:

If asked for say height of the lava bomb and I write 101.3m whilst the Lisachem answer is 101.25 m. Will I lose marks?

Similarly the kinetic energy of the canister answer was 337.5 J and Lisachem answer reads 340 J. Will I lose marks?

Speed of skateboard answer written as 3.38 m s whilst the STAV answer was 3.4 m s. Is my answer incorrect?

Magnitude of the friction force answer -I wrote 8.82 x 10 raised to -1 N whilst STAV answer was 0.88 N. Is my answer incorrect?

Would be happy to have your feedback. Thanks in advance.

in physics, rounding usually doesn't matter, the only problem is if you round off too much. giving too much accuracy isn't gonna lose you marks.

rounding to 101.3 m like in the first example isn't 'too much' IMO. as a general rule, give every digit before the decimal point (unless it's really big and you're using scientific notation), and depending on how many digits there are, you can include decimal places as appropriate