Calculating minimum force

  • Thread starter vbillej
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  • #1
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1. A 1 tonne rock is being dragged up a 30 degree slope using the a pulley system.
If there is a constant resistance to movement between the rock and the ground of 350N, calculate the minimum force necessary to drag the rock up the slope.



2.



3. All i got so far is

1t = 1000kg

1000kg x 9.8 (gravity)
=9800N
Acting upon the slope from the rock
 

Answers and Replies

  • #2
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Set up a free body diagram to find the forces acting on the rock.

Thanks
Matt
 
  • #3
tiny-tim
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Homework Helper
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Hi vbillej! :smile:
3. All i got so far is

1t = 1000kg

1000kg x 9.8 (gravity)
=9800N
Acting upon the slope from the rock
No, that's wrong …

9800N is the force of gravity on the rock.

There are four forces on the rock … gravity, normal force, friction force (= 350N), and the force from the rope.

As CFDFEAGURU :smile: says, set up a free body diagram.
 
  • #4
12
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Thanks both of you for your replies

Hi vbillej! :smile:

9800N is the force of gravity on the rock.

.
Yes i forgot its actually the weight from the rock, thanks for reminding me
 

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