Hey all

I’m really confused as to why we need to find an angle to find the uncertainty of the velocity. I just don’t understand what’s happening at all. I’ve attached the paper (it is q16 bii) and also the mark scheme

Please help!!

https://revisionscience.com/sites/revisionscience.com/files/imce/6PH01_01_que_20170524.pdf

I’m really confused as to why we need to find an angle to find the uncertainty of the velocity. I just don’t understand what’s happening at all. I’ve attached the paper (it is q16 bii) and also the mark scheme

Please help!!

https://revisionscience.com/sites/revisionscience.com/files/imce/6PH01_01_que_20170524.pdf

(edited 8 months ago)

As in part A, the detector only detects the velocity that is parallel to OA and neglects other velocity.

Let theta be the angle AOB and let u be velocity of served tennis ball.

So the recorded value will be u*cos(theta)

actual value will be u.

You can work out % error by working out theta.

Let theta be the angle AOB and let u be velocity of served tennis ball.

So the recorded value will be u*cos(theta)

actual value will be u.

You can work out % error by working out theta.

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