Hooke’s law 2

1. Hooke’s Law

2. Hooke’s Law Whilst the spring is demonstrating elastic properties, it obeys the following relationship: F is the force applied in Newtons (multiply mass(kg) by 10) e is the extension of the spring  

3. Next steps Complete your graph from last lesson. Don’t plot any more than 10 - 15 points. Work out the gradient for the line. Work out the size of the error bars for each plot. Determine the elastic limit

4. Gradient for you graphs Put the equation we’re using: i n the form  

5. Working out uncertainty When you need to work out the uncertainty from two readings multiplied together or divided, we follow the following method. Work out the uncertainties as percentages. For 5±0.5cm  

6. Working out uncertainty 2 Whether you are multiplying or dividing units, you will always add the uncertainties together. I measure the side of a cube to be 10±0.5cm What is its volume if all dimensions are the same? What is the uncertainty with that volume?