Coefficient of Static and Kinetic Friction Phys 10 IB LAb

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dan Stoica                April 1st, 2009

Coefficient of Static and Kinetic Friction

Problem:        Is there a relationship between mass and the coefficient of static and kinetic friction?

Variables:  

                The manipulated variable is the weight of the object that is being pulled.

The responding variables are the static friction, kinetic friction, and the coefficients of those.

        The controlled variable is the amount of weight that is added each trial, and the starting point on the scale.

Materials:

  • Wooden Block
  • Spring scale
  • String
  • 4 x 200 g masses

Procedure:         

  1. Determine the weight(normal force) of the wooden block.
  2. Attach a string through loop around a wooden block as shown in the diagram.
  3. Adjust the force scale to zero while it is in the horizontal position.
  4. Attach the spring scale to the loop and pull the block with as steady a sped across the table.
  5. Pull the block across the table and measure the peak force of friction before it starts to move.
  6. Repeat steps 4 and 5 with 200g, 400g, 600g, and 800g added weight on top.
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Observations:

Table #1: Mass, Static, and Kinetic Friction Data

Analysis:
                                        =mg therefore =mg

        

                                             

        

Calculating Normal Force on Trial 1:
= mg

 = (0.23817±0.001kg) (9.81ms¯²)
= 2.34±0.01N

Calculating the Coefficient of Static Friction:
        
                
        
                
Calculating the Coefficient of Kinetic Friction:

 = 0.4±0.3

Normal Force and Error for Trial 1: 2.34±0.01N

Coefficient of Static Friction and Error:

Coefficient of Kinetic Friction and Error:

Presenting Data:

Table #2: Normal Force and Coefficient of Static and Kinetic friction

Conclusion:

In the preceding lab, the goal was to find ...

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