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Math Help - science- force mass and acceleration

  1. #1
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    science- force mass and acceleration

    Hey guys please work this out for me showing me the steps and explaining it to me- science is so not my forte.

    g= 9.8m/s/s => this is what it says on top of the sheet. Do I really need it?
    Neglect friction. FIND THE FORCE REQUIRED.


    1) For a 50kg woman on a 20kg bicycle travelling at 6m/s to come to a halt in 2 seconds.

    2) To give a mass of 25 kgs. an acceleartion of 18m/s/s.

    3) To accelerate a 1500 kg space probe from 54 000 to 54900 kms/hr in 20 seconds.

    4) To increase the velocity of a 1 00 kg car from 10m/s to 20m/s in 5 seconds.
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  2. #2
    Member SengNee's Avatar
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    Quote Originally Posted by delicate_tears View Post
    Hey guys please work this out for me showing me the steps and explaining it to me- science is so not my forte.

    g= 9.8m/s/s => this is what it says on top of the sheet. Do I really need it?
    Neglect friction. FIND THE FORCE REQUIRED.


    1) For a 50kg woman on a 20kg bicycle travelling at 6m/s to come to a halt in 2 seconds.

    2) To give a mass of 25 kgs. an acceleartion of 18m/s/s.

    3) To accelerate a 1500 kg space probe from 54 000 to 54900 kms/hr in 20 seconds.

    4) To increase the velocity of a 1 00 kg car from 10m/s to 20m/s in 5 seconds.
    F=ma

    F is the force required or net force.
    m is the total mass.
    a is the rate of change in velocity.


    1)

    F=ma
    F=m\left(\frac{v-u}{t}\right)
    F=(50+70)\left[\frac{(0)-(6)}{(2)}\right]
    F=(120)(-3)
    F=-360N

    2)

    F=ma
    F=(25)(18)
    F=450N

    3)

    \Delta v
    =54900-54000
    =900 kmh^{-1}
    =\left(\frac{900\times 1000}{1\times 60\times 60}\right)ms^{-1}
    =250ms^{-1}

    F=ma
    F=m\left(\frac{\Delta v}{t}\right)
    F=(1500)\left(\frac{250}{20}\right)
    F=18750N

    4)

    F=ma
    F=m\left(\frac{v-u}{t}\right)
    F=(100)\left[\frac{(20)-(10)}{5}\right]
    F=200N
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