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A level physics vectors


Zion
Posts: 7
 Zion
GCSE Maths (H), KS3/GCSE Maths (F), GCSE Science (H), KS3/GCSE Science (F), GCSE English, GCSE Statistics, GCSE Business Studies, GCSE Economics, GCSE Comp Sci
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(@zion)
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image

When I draw a third line to make a vector triangle . How am I meant to identify the ‘adjacent’ and ‘opposite’ sides when there is no angle given? 

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Further_Maths_Student
Posts: 274
(@further_maths_student)
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Joined: 3 years ago

You can re-draw the diagram like this

image

Then you do pythagoras with the two numbers to get the resultant force

Then to get direction, you need to work out the angle that I've drawn on. I would do this by doing SOH/CAH/TOA with the triangle then doing 90 degrees - your answer.

Similar method for the next question

Hope that made sense

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Zion
Posts: 7
 Zion
GCSE Maths (H), KS3/GCSE Maths (F), GCSE Science (H), KS3/GCSE Science (F), GCSE English, GCSE Statistics, GCSE Business Studies, GCSE Economics, GCSE Comp Sci
Topic starter
(@zion)
Active Member
Joined: 2 years ago

Pls could you explain b that’s the one I needed help on. I don’t know how to identify adjacent and opposite because there is no angle when you draw the third line . 

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