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How Does The Mass On A Wooden Block Affect The Force Needed To Pull It Along A Bench?

Extracts from this document...

Introduction

Vikki Holness 10MP        Page         5/1/2007

How Does The Mass On A Wooden Block Affect The Force Needed To Pull It Along A Bench?

Planning

Introduction:

For wood to be pulled along a surface, the amount of force needed to get it moving must be greater than the total forces that are preventing it from moving.e.g. Friction. I will Test what force is needed to pull the block along at a steady speed and what effect changing the mass of the object will have. This force will be measured in Newtons (N).

Hypothesis:

An effect, which may change the force needed to pull the block and masses along, is Friction. Friction is caused by microscopic ‘bumps’ on the surfaces of the two objects. These ‘bumps’ run into each other when the two surfaces rub together or along each other. These collisions prevent the objects moving past each other smoothly, which means that more force is needed to keep the object moving at a steady speed.

Middle

100g

0.3

0.3

0.3

200g

0.6

0.6

0.6

300g

1

1.1

1.05

400g

1.4

1.5

1.45

500g

1.7

1.7

1.7

600g

2

1.9

1.95

700g

2.3

2.4

2.35

800g

2.65

2.65

1.65

900g

3

3

3

1000g

3.5

3.5

3.5

1100g

3.9

3.7

3.8

1200g

4.3

4.2

4.25

Conclusion

1. Different surfaces/blocks of wood will have different surfaces. Some will be smoother than others. This would affect the results because the rougher the two surfaces moving across each other (in my case, the bench and the block of wood), the more friction that is caused. Therefore, rougher surfaces will require more force to pull them across the bench to counteract the extra friction. If the two surfaces were smoother, then less friction would be caused, so less force would be needed.
2. The speed at which you pull the block of wood might also affect the force needed.

To extend and improve the experiment you could see how different surfaces, both on the desk and the block would affect the experiment. Also, you could adjust the speed at which the block was being pulled to see if this affects the force needed.

This in turn would provide me with a wider range of results.

Vikki Holness 10MP        Page         5/1/2007

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