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10 Cards in this Set

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  • Back
What is Hookes law about?
Applying a force to an object can cause it to change shape temporarilly or permanently.

Extension is proportional to force!!
What is the length called of an unstretched piece of wire?
Its natural length
What happens if a metal wire is supported at the top and then weight attached to it at bottom
It stretches. The weight pulls down with force F, and produces an equal and opposite force at support
What did Robert Hooke discover in 1676?
That extension of wire or spring is proportional to load or force!!
How can you investigate Hookes law with a spring?
1. Setup apparatus as diagram
2. measure natural length of spring (with no load) using mm ruler
3. Add one mass at a time, allow spring to come to rest and measure extension (CHANGE IN LENGTH from original to stretched)
4. Do this six times for...
1. Setup apparatus as diagram
2. measure natural length of spring (with no load) using mm ruler
3. Add one mass at a time, allow spring to come to rest and measure extension (CHANGE IN LENGTH from original to stretched)
4. Do this six times for enough measurements
5. Repeat experiment for reliability and calculate average value for each weight
When does Hookes law stop working?
When force is great enough!
What does Hooke's law look like on a graph, including when it stops working
First part of graph shows law being obeyed, until elastic limit is reached.
First part of graph shows law being obeyed, until elastic limit is reached.
What happens if you increase the force past the elastic limit?
Material will be permanently stretched
What is elastic behaviour?
When a material returns to its original shape when force removed
What sort of materials only obey Hookes law for a short while?
Rubber