FM1 - Hookes Law Flashcards Preview

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Flashcards in FM1 - Hookes Law Deck (20):
1

What does Hookes law say?

Extension is proportional to force

2

What is an unstretched metal wire called?

Natural length

3

If a metal is supported at the top and then a weight is attached at the bottom was happens?

It stretches - the weight pulls down with force F, is producing an equal and opposite force at the support

* Also happens in helical springs

4

What did Robert Hooke discover in 1676?

That the extension of a stretched wire is propotional to the load or force

5

How will a metal spring also obey Hookes Law?

If a pair of opposite forces are applied to each end

6

How can you investigate Hookes Law?

Use a spring

7

What equipment do you need to investigate Hookes Law?

- A clamp
- Spring
- A hanging mass
- Weighted stand
- Extra masses

8

Describe a method for measuring Hookes Law?

1) Measure length of spring without any load (natural length)
2) Add one mass at a time allowing the spring to come to a rest, then measure new length of spring -record results
3) The extension is the change in length from the original length
4) Repeat this process and calculate an average

9

When does Hookes Law stop working?

When the force is great enough

10

What should Hookes look like for a metal wire on a graph?

A straight line relationship between force and extension

11

What happens on a graph when the force becomes great enough?

The graph starts to curve - it is called the elastic limit

12

If a metal is supported at the top and then a weight is attached at the bottom was happens?

It stretches - the weight pulls down with force F, is producing an equal and opposite force at the support

* Also happens in helical springs

13

What did Robert Hooke discover in 1676?

That the extension of a stretched wire is propotional to the load or force

14

How will a metal spring also obey Hookes Law?

If a pair of opposite forces are applied to each end

15

How can you investigate Hookes Law?

Use a spring

16

What equipment do you need to investigate Hookes Law?

- A clamp
- Spring
- A hanging mass
- Weighted stand
- Extra masses

17

Describe a method for measuring Hookes Law?

1) Measure length of spring without any load (natural length)
2) Add one mass at a time allowing the spring to come to a rest, then measure new length of spring -record results
3) The extension is the change in length from the original length
4) Repeat this process and calculate an average

18

When does Hookes Law stop working?

When the force is great enough

19

What should Hookes look like for a metal wire on a graph?

A straight line relationship between force and extension

20

What happens on a graph when the force becomes great enough?

The graph starts to curve - it is called the elastic limit