stressingrn
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when you are solving momentum or impulse for normal numbers you need to always choose a positive direction. do you need to pick a positive direction if the velocity/impulse is given in vector form? someone explain
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mqb2766
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(Original post by Maryyyxxx)
when you are solving momentum or impulse for normal numbers you need to always choose a positive direction. do you need to pick a positive direction if the velocity/impulse is given in vector form? someone explain
When the velocity is given in either form, there is implicitly a direction or coordinate system defined. if a speed (magnitude) is givem, you need to set up your own coordinate system and use it consistently.

Coud you upload an actual question which illustrates your confusion?
Last edited by mqb2766; 1 month ago
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stressingrn
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(Original post by mqb2766)
When the velocity is given in either form, there is implicitly a direction or coordinate system defined. if a speed (magnitude) is givem, you need to set up your own coordinate system and use it consistently.

Coud you upload an actual question which illustrates your confusion?
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This is like a question of what I meant. I got most of the exercises wrong because I was setting a positive direction for the velocity, but i think I understand since vectors already have a direction , so thank you
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mqb2766
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(Original post by Maryyyxxx)
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This is like a question of what I meant. I got most of the exercises wrong because I was setting a positive direction for the velocity, but i think I understand since vectors already have a direction , so thank you
Yes, so the same coordinate axis is used for displacement, velocity, acceleration, force (impulse) as theyre related by derivatives/integrals. It generally helps to sketch it when you start the question.
Last edited by mqb2766; 1 month ago
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