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Investigating a cantilever

Extracts from this document...

Introduction

Investigating a cantilever

Apparatus:

Method:

1. Collect apparatus and assemble as in diagram
2. Chose a distance of how far away the weights will be from the table edge
3. Chose a starting weight to be added to the end of the ruler
4. Measure the vertical dip down that the weight causes
5. Record this length, and repeat procedure, this time with a different weight
6. After 12 different weights have been used and the results recorded, change the distance of the weights from the edge of the table

Prediction

I predict that as the weights are added to the end of the cantilever the vertical dip down will increase. The increase should be directly proportional, so the graph would have a straight line on it. Hooke’s Law sates that ‘The extension is directly proportional to the load’ which the cantilever will obey. However a material can reach its elastic limit, when very heavy loads are placed on it.

Middle

Vertical dip down (cm)

I obtained this prediction from preliminary experiments, which involved the stretching of a copper wire. The extension increase was directly proportional up to the copper wires elastic limit, at which the original increase increased, and the wire never returned to its starting length. This caused it to be permanently deformed.

Analysis:

From my results, I conclude that the increase in load on a cantilever is directly proportional to an increase in weight. Looking at the straight lines on the graph can see this. This shows that the increase is directly proportional. If the line had curved, then the increase would clearly not be proportional. The cantilever was directly proportional to the weights added because the molecules were condensing at the bottom of the cantilever and stretching at the top. The pull equalled the force downwards so it went down proportionally. However

Conclusion

basic analysis: "the cantilever was directionaly proportional to the weights

added" this is because the molecules were condencing at the bottom of the

cantilever and stretching at the top. The pull equaled the force downwards

so it went down proportionally.

basic evaluation: "the experiment could improve by......." talk about

changing the temp and the light and stuff.Then talk about the shape of the

graphs (both directionaly proportional.) Conclude by stating what happend

and if it matched your prediction.

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