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# M2 question watch

1. the total mass of a man and his bike is 80kg. the man freewheels down a slope where sinx=1/7 with constant acceleration 0.9 m/s^-2
a) prove that the total magnitude of the resistive forces opposing motion is 40N
2. (Original post by realicetic)
the total mass of a man and his bike is 80kg. the man freewheels down a slope where sinx=1/7 with constant acceleration 0.9 m/s^-2
a) prove that the total magnitude of the resistive forces opposing motion is 40N
completely ignore this thread lol just me being stupid
3. use F=ma parallel to the slope (weight acts downwards, and Fr is the resistive force parallel to the slope and opposite the direction of the acceleration)
80gsinx - Fr = 80 * 0.9
rearrange to give: Fr = (80 * 9.8 * 1/7) - (80 * 0.9) = 112 - 72 = 40N

Hope this helps, good luck with exams!

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