- #1

paulimerci

- 287

- 47

- Homework Statement
- A 65 kg cyclist on a 10 kg bicycle is moving uphill on a 9° slope. How much force does he provide

if the bicycle slows at a rate of 0.3 m/s2?

- Relevant Equations
- Net force = ma

F parallel - F applied - rolling resistance = ma

I don't know how to calculate for rolling resistance. If the bicycle is not slipping rather it is rolling, should I ignore rolling resistance? And if I ignore that I would get,

F parallel - F applied = ma

F applied = F parallel -ma

= mg sin theta -ma

= 75x0.3 - 75 x 9.8 x sin9

= 92.5N

And the answer I got is not correct. Looks like mass is taken as 65kg and not as combined mass 75kg and I don't know why?

I don't know how to calculate for rolling resistance. If the bicycle is not slipping rather it is rolling, should I ignore rolling resistance? And if I ignore that I would get,

F parallel - F applied = ma

F applied = F parallel -ma

= mg sin theta -ma

= 75x0.3 - 75 x 9.8 x sin9

= 92.5N

And the answer I got is not correct. Looks like mass is taken as 65kg and not as combined mass 75kg and I don't know why?