What formula do I use?

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wr1015
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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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  • #2
Tide
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What formula do I use?

Use [tex]\vec F = m \vec a[/tex]
 
  • #3
wr1015
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Tide said:
Use [tex]\vec F = m \vec a[/tex]

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:
 
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  • #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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