Accleration and force?

  • Thread starter bionut
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  • #1
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An athlete (mass of 50 kg) is moving with a constant velocity of 5ms. Determine the resultant force acting on him.

If it's a constant velocity he is not acclerating? Therefore a = 0 m/s/s; F=ma F=50 X 0 = 0N?

But there has to be a force dosent there? Would the force be equal to the mass affcted by gravity f=mg = 50 490.5N or is it 0N?
 

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  • #2
cepheid
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But there has to be a force dosent there?
Why?
 
  • #3
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So if he's moving at a constant velocity --- hes not accerating therefore threre is no force affecting his velocity?
 
  • #4
cepheid
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So if he's moving at a constant velocity --- hes not accerating therefore threre is no force affecting his velocity?
No NET force, yes. Meaning all the forces that are acting on him (if any) must cancel each other out. That's Newton's second law. No net force means no acceleration.
 

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