1. Sep 13, 2005 #1

   Kain

   

   considering i am not 2 smart at these things i really need help. it's probably the easiest problem out there, but like i said, i'm a dumbass. here it is
   
   A 1.2 tonne car (a laser) is accelerated from the lights at 1m/sec/sec. What unbalanced force do the wheels exert on the ground??
   
   I thought it might be 1.2 x 10^3 but im not sure
   
   Thanks

    

   Kain, Sep 13, 2005
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3. Sep 13, 2005 #2

   James R

   

   Science Advisor

   Homework Helper

   Gold Member

   F=ma
   
   so the force on the car to make it accelerate is (1.2 x 10^3) x 1 = 1.2 x 10^3 N.
   
   This force is applied by the ground to the wheels. There is an equal and opposite reaction force due to the wheels pushing on the ground, according to Newton's third law

    

   James R, Sep 13, 2005
4. Sep 14, 2005 #3

   mukundpa

   

   Homework Helper

   Kain,
   you are smart enough

    

   mukundpa, Sep 14, 2005

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