#Forces and friction

15 messages · Page 1 of 1 (latest)

trim umbra
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I am stuck on all except 9a

IMG_2089.png
left warren
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So for 9

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You know the acceleration

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If its moving up, Tension - Weight = Mass * acceleration

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If its going down

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Weight - Tension = Ma

undone abyss
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if you draw a diagram or just visualise it it’ll make a lot of sense

left warren
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btw u acc gotta use 9.8

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And give ur ans to 2 or 3 s.f

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Or u probs lose a mark

undone abyss
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I’ve not done ts in maths yet

left warren
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goat

left warren
# trim umbra I am stuck on all except 9a

For 10
the distance travelled in the 2 seconds is
(0+1)/2 * 2 =1
Final energy = KE = 25J
= work done by Driving Force - work done by resistive forces
25 = Fd - 20d, d is 1 so
F = 45