# Investigation of Different Static and Frictional Coefficient Forces

Topics: Friction, Force, Classical mechanics Pages: 6 (1095 words) Published: May 1, 2013
De Vos Malan High School,
Kingwilliamstown,
Eastern Cape

Educator: Mrs Weweje

Learning Area:PHYSICAL SCIENCE SCIENTIFIC REPORT

Title:INVESTIGATION OF DIFFERENT STATIC AND FRICTIONAL COEFFICIENT FORCES

Part One

Hypothesis

1. Wood- 25 degrees

2. Plastic- 10 degrees

3. Aluminium- 19 degrees

4. Glass- 23 degrees

5. Fine Sandpaper- 41 degrees

6. Coarse Sandpaper- 30 degrees

Results

|Column 1 |Column 2 |Column 3 |Column 4 | |Material on wood |Predicted arrangement |Magnitude of angle of slip |Arrangement according to results | |Wood |10 |29 |Plastic-15 | |Plastic |19 |15 |Aluminium-19 | |Aluminium |23 |19 |Glass-24 | |Glass |25 |24 |Wood-29 | |Fine sandpaper |45 |49 |Coarse sandpaper-33 | |Coarse sandpaper |41 |33 |Fine sandpaper-49 |

Interpretation of results

1. Wooden block

2. Wooden block on various materials e.g. wood on plastic

3. Protractor and wooden block due to the constant changing of positions.

4. Tyres.

5. Body of the car so that car is easily controlled.

6. Replace sliding friction with rolling element friction, such as with the use of rolling element bearings or Improve overall lubrication either by changing viscosity, using differing or improved additives or through the use of different lubricants themselves.

Conclusion

As seen above from the experiment/practical done it shows that friction exists in any type of surface whether it is on wood, aluminium or glass etc. it also shows that some objects have high coefficients of friction which basically means that they have more traction control with the surface in contact with and some objects show low coefficients of friction due to that they have less traction control on the surface which it is in contact with.

Part 2

Investigation Question

Will the mass pieces influence the coefficients of friction? Will the static frictional coefficient be lower than the kinetic coefficient of friction? Will different forces be needed for static and kinetic frictional force?

Hypothesis

The mass pieces will influence the coefficients of friction both static and kinetic frictional forces due to that a different force is needed to start the wooden block and mass piece to move due to that static frictional force is acting against the wooden block and the mass piece. Also a different force will be needed for kinetic frictional force to keep the wooden block and mass piece at a constant velocity but lesser than the static frictional force due to that the wooden block and the mass piece has started moving.

Results

|Combination |Weight |Static frictional force |Kinetic frictional force | | |N |N |N | |Wooden block + 1 kg mass piece |11.1 |4.8 |2.8 | |Wooden block + 2 kg mass piece |20.9 |9.3 |5.5 | |Wooden block + 3 kg...