Practial 5 - Investigation of the force-extension relationship of rubber Flashcards

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1
Q

What do we hang from a stand, boss and clamp?

A

Cut rubber band

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2
Q

Where do we hang the cut rubber band from?

A

The stand, boss and clamp

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3
Q

What’s the cross-section of the rubber band used?

A

1mm by 2mm

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4
Q

What do we hang from the band?

A

50g mass holder

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5
Q

What do we use to measure the length of the band?

A

A metre rule

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6
Q

Resolution of the metre rule used

A

+-0.001m

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7
Q

How can we accurately measure the extension?

A

Using an optical pin attached to the base of the mass holder

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8
Q

Where would an optical pin be attached and what would this do?

A

The bottom of the mass holder to accurately measure the band’s length

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9
Q

What do we also need to measure for the rubber band as well as length after being stretched?

A

Width and thickness

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10
Q

What do we measure the width and thickness of the rubber band using?

A

A micrometer

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11
Q

Resolution of the micrometer

A

+-0.01mm

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12
Q

What do we need to take care not to do when measuring the width and thickness of the rubber band?

A

Squish the band with the micrometer

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13
Q

How do we increase the mass on the rubber band?

A

In 50g steps

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14
Q

What are we measuring each time we add new weights and how do we work this out?

A

Extension (new length-original length)

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15
Q

When do we stop measuring the rubber band?

A

When it breaks

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16
Q

What type of graph do we plot and what can we use it to do?

A

Force-extension to determine the Youngs Modulus from the linear section

17
Q

How do we measure extension?

A

Measure the original length, then the new length, and subtract from each other