• 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:

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

Conclusion 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 =  = 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.

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

# Related International Baccalaureate Physics essays

1. ## IA Lab report rubber bands

This would have removed air resistance. However, the experiment probably would not have been affected that much, but it would have been improved, at least to some extent.

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

This happens because as the elasticity of the string increases, it stretches and therefore, the tension force is also spread about a wider area. Relation of tension to the strain values of strings The strain values have been calculated in the previous section and it is found out that ?nylon < ?band .

1. ## Simple Harmonic Motion Physics HL Lab Report

versus Period (T), the line of best fit should pass through the origin to indicate a direct proportionality relationship as was predicted. However, we can see that the line of best fit passes through the point far away from the origin and not through the origin as was required for my prediction to be correct.

2. ## Centripetal Force

0.008128 0.0000661 7.45 0.745 1.342282 1.801721 0.398630 -0.014168 0.0002007 7.22 0.722 1.385042 1.918340 0.424432 0.011634 0.0001354 7.49 0.749 1.335113 1.782528 0.394383 -0.018415 0.0003391 6.78 0.678 1.474926 2.175407 0.481308 0.068510 0.0046937 ?Fc= 4.127976 0.0116417 Average centripetal force: Standard deviation: So, the centripetal force of mass 10 g is: Force of gravity

1. ## THermal Physics Lab

water which was placed inside the cooler, every 3 minutes (180 seconds) for 30 minutes (1800 seconds). The heat loss from hot water and milk with their respective error for every 180 seconds was calculated. Then the heat loss from water for the whole time was added to find the total heat loss from water.

2. ## Experiment on looking at enthalpy of solutions

228,00 15,00 15,10 15,05 229,00 15,00 15,10 15,05 230,00 15,00 15,10 15,05 231,00 15,00 15,10 15,05 232,00 15,10 15,10 15,10 233,00 15,10 15,10 15,10 234,00 15,10 15,10 15,10 235,00 15,10 15,10 15,10 236,00 15,10 15,10 15,10 237,00 15,10 15,10 15,10 238,00 15,10 15,10 15,10 239,00 15,10 15,10 15,10 240,00 15,10

1. ## 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 =

2. ## HL Physics Revision Notes

Specific latent heat (L). L=Q/m Fusion: The change of phase from solid to liquid Vaporization: The change of phase from liquid to gas Pressure is the force gas molecules exert due to their collisions (with an object). P=F/A i.e. force per unit area. • Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to 