What is the minimum work needed to push a car

  • Thread starter bosox3790
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  • #1
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What is the minimum work needed to push a 1025 kg car 200 m up along a 17.5° incline?

(a) Ignore friction.
I got 604117.9512J
(b) Assume the effective coefficient of friction retarding the car is 0.40?
how do I get this one?
 

Answers and Replies

  • #2
1,444
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for a) what does work do? What aspect of the car does it change??? How do you calculate the work done then?
 
  • #3
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Do I need to know Work in this case?
 
  • #4
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bosox3790 said:
Do I need to know Work in this case?
you can calculate work

work changes the energy
 
  • #5
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Use the work-energy theorem:
[tex] W= \Delta K + \Delta U + |W_{fric}|[/tex]
To find the minimum work, push the block slowly so that [tex] \Delta K=0[/tex]. In (a), W_fric = 0. What is W_fric in (b)?
 

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