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Project Summary

Difficulty  2 
Time required Very Short (a day or less)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety No issues

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Abstract

As you headed up the mountain to enjoy your last ski trip, you may have noticed a sign reading: Hazard! Icy Roads Ahead—Put On Your Chains. Putting chains on car tires increases the resistance between the tires and the road allowing the car to "grip" the road. This resistance to sliding is called friction. In this experiment, you will be investigating how to increase and decrease the friction between two surfaces.

Objective

The goal of this project is to compare friction between dry and icy surfaces by measuring slip angle and slip height.

Introduction

Friction is the resistance to motion when two objects rub together.

For example, would it be easier to ride your sled down an icy snow-covered hillside or down a rough gravel driveway? It is easier to ride your sled down the icy hillside because both the runners on your sled and the hillside are smooth and slide past one another with little resistance. The icy hillside is an example of a surface with low friction.

Riding your sled down the gravel driveway is difficult due to the rough surface of the driveway resisting the motion of the sled. The gravel driveway is an example of a surface with high friction.

Terms, Concepts and Questions to Start Background Research

Questions

Bibliography

Materials and Equipment

Experimental Procedure

  1. Soak one piece of wood in water and freeze overnight.
  2. Fill the plastic tub with sand and close the lid.
  3. Build a ramp using several books and the piece of wood.
  4. Determine the ramp height and ramp angle at which the tub of sand first slips down the ramp.
    1. Place the tub of sand onto the ramp.
    2. If it slips down the ramp, remove the tub, lower the ramp height and try again.
    3. If it does not slip, remove the tub, raise the ramp height and try again.
    4. Make your changes in height small enough so that you can accurately determine the ramp height and ramp angle just high enough to allow the tub to slip down the ramp.
  5. At the angle that the tub first moves, measure the height of the book pile with the meter stick and the angle of the ramp with the protractor. Record your results.
  6. Conduct the same experiment (steps 2–5) with the icy wood.
  7. For any experiment, it is important to do multiple trials to assure that your results are consistent. Repeat steps 2–5 for at least three separate trials for each surface, and record your results. It will be easier to keep track of your results if you write them down in a table in your lab notebook. Here is a sample table for data collection:

    Sample Data Table
    Condition
    (name)
    Trial
    (#)
    Slip Angle
    (°)
    Slip Height
    (cm)
    Average Slip Angle
    (°)
    Average Slip Height
    (cm)
    Dry Wood 1        
    2    
    3    
    Icy Wood 1        
    2    
    3    

Variations

Credits

La Né Powers


Last edit date: 2006-02-22 00:42:20


Career Focus

If you like this project, you might enjoy exploring careers in Physics.

Physicist
Physicists have a big goal in mind—to understand the nature of the entire universe and everything in it! To reach that goal, they observe and measure natural events seen on Earth and in the universe, and then develop theories, using mathematics, to explain why those phenomena occur. Physicists take on the challenge of explaining events that happen on the grandest scale imaginable to those that happen at the level of the smallest atomic particles. Their theories are then applied to human-scale projects to bring people new technologies, like computers, lasers, and fusion energy.
 



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