1. Hooke’s Law

2. Learning objectives Investigate the effect of adding masses to springs
Deduce Hooke’s law regarding the effect of weight on the length of springs
Determine the weight of different masses on earth
Determine an unknown value from a graph

3. What to do….
Measure the length

4. Results…. Mass (g) Weight (N) Length (mm) Extension (mm) 50 100 15050
100
150
200
250
300
350
400
450
500

5. Plot a graph Decide what goes on the vertical axis
Write a conclusion from the graph
Weight (N)

6. Extension!
Repeat with a rubber band!

7. Hooke’s Law! Elastic limit is exceeded!
The extension of the spring is PROPORTIONAL to the weight. This means that doubling the weight will double the extension.