FM1 - Hookes Law Flashcards

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1
Q

What does Hookes law say?

A

Extension is proportional to force

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2
Q

What is an unstretched metal wire called?

A

Natural length

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3
Q

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

A

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

  • Also happens in helical springs
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4
Q

What did Robert Hooke discover in 1676?

A

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

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5
Q

How will a metal spring also obey Hookes Law?

A

If a pair of opposite forces are applied to each end

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6
Q

How can you investigate Hookes Law?

A

Use a spring

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7
Q

What equipment do you need to investigate Hookes Law?

A
  • A clamp
  • Spring
  • A hanging mass
  • Weighted stand
  • Extra masses
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8
Q

Describe a method for measuring Hookes Law?

A

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

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9
Q

When does Hookes Law stop working?

A

When the force is great enough

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10
Q

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

A

A straight line relationship between force and extension

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11
Q

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

A

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

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12
Q

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

A

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

  • Also happens in helical springs
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13
Q

What did Robert Hooke discover in 1676?

A

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

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14
Q

How will a metal spring also obey Hookes Law?

A

If a pair of opposite forces are applied to each end

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15
Q

How can you investigate Hookes Law?

A

Use a spring

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16
Q

What equipment do you need to investigate Hookes Law?

A
  • A clamp
  • Spring
  • A hanging mass
  • Weighted stand
  • Extra masses
17
Q

Describe a method for measuring Hookes Law?

A

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
Q

When does Hookes Law stop working?

A

When the force is great enough

19
Q

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

A

A straight line relationship between force and extension

20
Q

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

A

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