SPH4U 4.1 Work done by a constant force

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These videos are designed to cover the Grade 11 and 12 Ontario Physics curriculum. Please enjoy!
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I'm a senior in ontario and your videos are the reason I'm doing well! Thank you:)!

baraamohammed
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For the last questions how is it 180 degrees?

rosaelzaharna
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Doesnt friction always act parallel to the direction of motion?

madhavgopakumar