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How to calcoulate force applied?

  • #1

Homework Statement


if the coefficient of friction between a 30 kg metal block and the floor is 0.16, what force is required to roll this block across the floor at a uniform speed? how much work is done? find : weight of force, normal force, force applied and fricitional force


Homework Equations


fn=mg
Ff=UxFn


The Attempt at a Solution

so far i only got this
weight of force = 294
normal force =294
frictional force = 47.04

How do i get force applied?
 

Answers and Replies

  • #2
CAF123
Gold Member
2,906
88
Uniform speed implies zero acceleration. Have you drawn a free body diagram?
What does 'weight of force' mean? Given your numbers, I think you mean the gravitational force on the object.
 
  • #3
58
0
to get uniform motion you need to make the net force on the body equal 0
 
  • #4
CWatters
Science Advisor
Homework Helper
Gold Member
10,529
2,295
Draw the free body diagram. To move the block the applied force has to be greater than or equal to the oposing frictional force. If it's greater than the frictional force the block will accelerate. The problem states it's "uniform speed" so it's not accelerating. Leading to the obvious answer.

As for "How much work is done" remember that

Work = force * distance
 

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