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BR chapter 1, #17 in 52 q test: mass vs acceleration

Discussion in 'MCAT Study Question Q&A' started by PREMED501, Jan 15, 2014.

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  1. PREMED501

    PREMED501 5+ Year Member

    Dec 1, 2011
    I'm having trouble reconciling the fact that mass and acceleration are unrelated in kinematics problems yet inversely proportional when talking about force/f=ma. Problem 17 in 52 question test in chapter 1 of BR says they are unrelated when an object is pushed up air ramp, etc. can someone please explain this question and answer to me
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  3. brood910

    brood910 2+ Year Member

    Jul 21, 2011
    On the ramp = F = mgsin, assuming no frictional force.
    Then, ma = mgsin, where m cancels out. Mass does not affect acceleration.
    You should write out all the forces present and set them equal to ma to see what affects a.

    p.s. I didnt look at the problems. This is just a basic fact regarding ramps.
  4. pjk77


    Oct 20, 2013
    yep. even if frictional force, you'll get mgsintheta- ukmgcostheta= mg and m cancels all the way through.

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