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Motor and driver net force

  1. Feb 15, 2015 #1
    A motor and driver have a total mass of 300 kg . The driver starts moving from rest reaching an acceleration of 5 m / s2. The net force experienced by the motor of the motorcycle is

    I'm not sure if i did this right cause they give 60 newtons as one of the answers.


    I applied newton's second law and got 1500 newtons. But the ''net force experienced by the motor of the motorcycle'' keeps throwing me off.
     
  2. jcsd
  3. Feb 15, 2015 #2

    mfb

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    Is this the full problem statement? In particular, is there a motor mass given or something else? If not, the answer looks strange.
     
  4. Feb 15, 2015 #3
    I think I translated it wrong. These are in Spanish sorry.

    ''A driver and his motorcycle have a total mass of 300 kg . The driver starts moving from rest reaching an acceleration of 5 m / s2. The net force experienced by the motor of the motorcycle is? ''

    A.1500 N
    B. -1500 N
    c -60 N
    D. 60 N
     
  5. Feb 15, 2015 #4

    mfb

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    Then 60 does not make sense.
    It is a typical wrong answer in a multiple choice question, as you can get this number if you combine the two given numbers in the wrong way (300/5), but it is certainly not the right answer.
    Maybe some mistake in the solution keys.
     
  6. Feb 15, 2015 #5

    rude man

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    I vote for your answer. What's wrong picking "A"?
     
  7. Feb 15, 2015 #6

    NascentOxygen

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    Action: To maintain this acceleration, the propelling force delivered to the bike + rider is 1500N. Reaction: The driving tyre sees this load component as -1500N.

    Perhaps that is the intended answer (B)?
     
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