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Old Feb 4th 2011, 11:53 PM   #1
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Motion help

Blah is riding a motorised scooter along a level bike path. The combined mass of blah and her scooter is 80 kg. The frictional and drag forces that are acting total to 45N. What is the magnitude of the driving force being provided by the motor if:

a. She is moving with a constant speed of 10m/s
b. she is accelerating at 1.5m/s^2

Just some direction / what formulas would do.

Cheers
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Old Feb 5th 2011, 06:52 AM   #2
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since there are only two forces acting horizontally,

a) use Newton's first law

b) use Newton's second law

to find the unknow force
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Old Feb 5th 2011, 07:33 PM   #3
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So

a) 45N
b) 165N ?

thanked. (:
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Old Feb 5th 2011, 08:54 PM   #4
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yes. I think you've got it right
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