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What formula do I use?

  1. Sep 15, 2005 #1
    What formula do I use???

    A shopper pushes a 7.3 kg shopping cart up a 13° incline, as shown in Figure 5-21. Find the horizontal force, F, needed to give the cart an acceleration of 1.63 m/s2.
     

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  3. Sep 15, 2005 #2

    Tide

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    Use [tex]\vec F = m \vec a[/tex]
     
  4. Sep 15, 2005 #3
    i did that and got 18.99 N but its being counted as wrong. There are some formulas in my book that show horizontal force as [tex]\sum\\F_{x}=F_{1},_{x}+F_{2},_{x}=F_{1}+F_{2}\cos\theta[/tex] but am not given any forces?? :confused:
     
    Last edited: Sep 15, 2005
  5. Sep 16, 2005 #4

    Tide

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    You know what the force of gravity is! It's direction is vertical but has a component parallel to the incline. The shopper applies a horizontal force which also has a component parallel to the incline. The sum of the forces parallel to the incline equals mass times acceleration along the incline.

    You should be able to take it from there.
     
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