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    luis00's Avatar
    luis00 Posts: 12, Reputation: 1
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    #1

    Oct 7, 2010, 08:00 PM
    net force
    1) Find the net force (in Newton) required to accelerate a 110 kg bike and rider from rest to a final velocity of 22.7 m/s in 10 seconds. Ignore any friction.

    Since f=ma, is it 110(22.7)=2497 N and then do I divide that by 10 seconds?

    2) A car is slides down an icy driveway that slopes at an angle of 10 degrees. What is the acceleration of the car?
    I don't know how I would solve this one. Since the motion is horizontal is it (cos 10) but that doesn't give me acceleration.
    luis00's Avatar
    luis00 Posts: 12, Reputation: 1
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    #2

    Oct 7, 2010, 08:04 PM
    Please ignore question 2
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Oct 8, 2010, 01:02 AM

    In F = ma, the a is the acceleration, not the speed.

    You need to first use:

    v = u + at

    To find the value of a.
    v is the final velocity,
    u the initial velocity and
    t is the time.

    Care to try it again? :)
    luis00's Avatar
    luis00 Posts: 12, Reputation: 1
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    #4

    Oct 8, 2010, 11:59 AM
    so the acceleration is 2.27, this is what I did
    110(2.27)=249.7 N
    correct?
    Thanks!
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    Unknown008 Posts: 8,076, Reputation: 723
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    #5

    Oct 8, 2010, 12:11 PM

    Correct! :) Well done.
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