# Elasticity is usually measured using Hooke's Law, F=kx,

Essay by Przemek624High School, 11th gradeA+, September 2006

0. Introduction

Elasticity is usually measured using Hooke's Law, F=kx, where F represents the force pulling the object, k represents the proportionality constant and x represents the extension in which the object increased its length by. (Giancoli Physics, P237)

1. Planning (A): aims of the experiment

Research question:

Using Hooke's Law, what is the biggest weight possible to be hanged on a spring and rubber bands, while continuously adding weights?

Hypothesis:

I predict that the rubber band nor the spring will be able to hold more than 2 kg of weight.

Variables:

Independent Dependent Control Variables

Weight ( force ) Spring / rubber band Spin of the weight

Volume of the weight

2. Planning (B): methods and tools

List of apparatus:

1 scale

2 rubber bands

1 spring

20 weights weighting 100g each

1 ruler

1 pencil

A piece of paper with a table

1 clamp

1 stand

Diagram of set-up:

Method:

1. The apparatus were gathered and set as drawn above

2. The actual value of the weight was measured using a scale

3. We carefully added on the weights

4. We measured the length using a ruler

5. Data was recorded onto a table

6. Repeat 2-5, and add extra weight every time.

3. Data Collection

Stretching a spring

Load Mass / kg Uncertainty in Load Mass / kg Length / cm Uncertainty in Length / cm

0 0 0 0

0,09 0,05 0,036 0,005

0,2 0,05 0,041 0,005

0,29 0,05 0,089 0,005

0,39 0,05 0,174 0,005

0,49 0,05 0,229 0,005

0,59 0,05 0,269 0,005

0,69 0,05 0,314 0,005

0,79 0,05 0,354 0,005

0,88 0,05 0,414 0,005

0,96 0,05 0,464 0,005

1,08 0,05 0,514 0,005

1,18 0,05 0,574 0,005

Stretching two rubber bands

Load Mass / kg Uncertainty in Load Mass / kg Length / cm Uncertainty in Length /...