• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Physics Friction Lab Report

Extracts from this document...

Introduction

Coefficient of Friction Lab

Planning B –

Apparatus:

  •  Pulley (minimum friction)
  •  String (minimum friction)
  •  Sandpaper sheet
  •  Wooden block
  •  Various masses (5g, 10g, 20g.. etc)
  •  Mass-hook (holder)
  •  Sticky tape
  •  Electronic scale (one per class)

Method:

  1. Gather all necessary materials listed above
  2. Using the electronic scale, measure the mass of the wooden block and record this, taking into account uncertainties where applicable.
  3. Attach the string to the wooden block, and the other end to a mass-hook.
  4. Place the sheet of sandpaper underneath the block and tape the sheet firmly in place on the table using sticky-tape (also note the exact position of the block on the sheet as we will try to keep that constant throughout)
  5. Screw on the adjustable pulley at one edge of a laboratory table
  6. Hang the mass hook off the table, using the mass pulley – if this already causes the block to move, then place a small weight on top of the block.  You set-up should look the following:
...read more.

Middle

Trial

Normal Reaction Force /N

Force of friction /N

±0.05 N

Average Force of Friction /N

±0.15 N

Friction Coefficient

Avg. Coefficient

± 0.05

1

2.25

1.74

1.74

0.78

0.77

2

1.73

0.77

3

1.74

0.77

Test 3

Trial

Normal Reaction Force /N

Force of friction /N

±0.05 N

Average Force of Friction /N

±0.15 N

Friction Coefficient

Avg. Coefficient

± 0.05

1

3.25

2.51

2.51

0.77

0.77

2

2.51

0.77

3

2.49

0.77

Test 4

Trial

Normal Reaction Force /N

...read more.

Conclusion

image03.png

        Note that this will give use the static coefficient of friction, which is different from the dynamic coefficient, but is what we were instructed to find in this particular lab.  To find our average coefficient of static friction, taking into account all the tests and all the trials, we would have (0.76 + 0.77 + 0.77 + 0.78 + 0.79) / 5 = image02.png

image02.png = 0.77 ± 0.05

        On the following page you will find a graph that plots the frictional force Ffr versus the normal reaction force R.  There is a clear linear relationship between the two forces, and this line should, ideally, pass through the origin.  

Uncertainties, and moreover, systematic error, have caused this line shift. For example, the friction of between the puller and the string meant that not all of the weight of the mass was transferred to pull the block, but since this happened every time, the relationship still holds although it is not from the origin.  Moreover, as we continued carrying out this experiment, one must keep in mind that the sandpaper was getting more and more “worn”, which reduces friction for the consequential trials.

...read more.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Physics essays

  1. physics lab report. Aim To determine the coefficient of static ...

    This assumption causes error in the readings because at the instant of motion the weight of the hanging masses is slightly greater than the frictional force acting on the block. 6. Not taking a conducting a sufficient number of trials. Improvements 1. Using a more accurate balance: e.g.

  2. Determination of Coefficient of Friction

    for every situation: When I added 0 weights, �kinetic = 0.15 / 0.60 = 0.25; When I added 1 weight, �kinetic = 0.30 / 1.60 = 0.1875; When I added 2 weights, �kinetic = 0.50 / 2.60 = 0.1923; When I added 3 weights, �kinetic = 0.65 / 3.60 =

  1. Suspension Bridges. this extended essay is an investigation to study the variation in tension ...

    that as the length of the string tied between the two supports decreases, the tension values increases. It is not only the maximum tension, but in fact tension at all points of application of force is more when the length of the string is 140 cm.

  2. Experiment on looking at enthalpy of solutions

    17,80 17,75 99,00 17,70 17,80 17,75 100,00 17,70 17,80 17,75 101,00 17,70 17,80 17,75 102,00 17,70 17,80 17,75 103,00 17,70 17,80 17,75 104,00 17,70 17,80 17,75 105,00 17,70 17,80 17,75 106,00 17,70 17,80 17,75 107,00 17,70 17,80 17,75 108,00 17,70 17,80 17,75 109,00 17,70 17,80 17,75 110,00 17,70 17,80 17,75

  1. Investigating the friction created on different surfaces. Factors that affect range of catapult

    Surface Range 1 (cm) (� 1) Range 2 (cm) (� 1) Range 3 (cm) (� 1) Range 4 (cm) (� 1) Range 5 (cm) (� 1) Mean (cm) Glass 55 56 56 54 52 55 Wood 46 46 48 47 44 46 Sandy 26 25 27 24 27 26 Fabric 27 26 27 25

  2. Centripetal Force

    ?t = �0.005 s 1 6.47 2 7.47 3 6.91 4 7.44 5 7.00 6 7.32 7 6.35 8 7.50 9 7.79 10 8.47 Table 3.3 Result of Time taken for 10 revolutions for mass 30 g Trial Time Taken t(s)

  1. physics lab report

    Sources of Error 1. The distance between the upper photogate and the position from which the metal sphere was dropped (as shown in figure 2). This means that the initial velocity of the metal sphere was not equal to 0ms�� as is assumed in the calculations.

  2. HL Physics Revision Notes

    P=F/A i.e. force per unit area. Assumptions of the kinetic model of an ideal gas: Newton?s laws apply to molecular behaviour There are no intermolecular forces The molecules are treated as points The molecules are in random motion The collisions between molecules are elastic There is no time spent in these collisions.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work