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16 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What does deform means? |
Deform means changing shape. |
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What is elastic deformation? |
An object undergoes elastic deformation when an object returns to it's original shape and size once the applied forces are removed. |
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What is an elastic material? |
An elastic material is a material that recovers its original shape and size when the applied force on it is removed after being stretched, compressed, twisted or bent. |
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Give 2 examples of elastic materials. |
Elastic materials; 1) steel 2) wooden rulers |
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When does materials undergo plastic deformation? |
Plastic deformation occurs when materials do not return to their original shapes and sizes once they are deformed. |
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What does Hooke's law states? |
Hooke's law states that, provided that the proportionality limit is not exceeded, the extension of a body is proportional to the applied force. |
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State the formula for Hooke's law. State what is F. |
Formula for Hooke's law: F= ke (F is the tension (force) acting on the string) |
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What is the spring constant? |
The spring constant is the ratio of force to extension. |
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Why is the spring constant measured in Nm-1 ? |
The spring constant is measured in Nm-1 because it is the force per unit extension. |
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Draw a graph of force against extension. |
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Draw a graph of extension against force. |
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What happens when we extend the spring beyond point P? |
If we extend the spring beyond point P, the extension is no longer proportional to the load. |
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Describe an experiment to illustrate Hooke's Law for a spiral spring. |
To illustrate Hooke's Law for a spiral spring ; Apparatus: metre rule, retort stand, weights, spiral spring, pointer. Procedure: 1. Set up the apparatus as shown. 2. Record the pointer reading, R1.
3. Add loads of 50g each time and record the pointed reading R2. 4. Record the reading in a table ( load(g), pointer reading R2(cm), Extension (e= R2-R1)cm.5. Plot a graph of extension against load.(look in hint) 4. Record the reading in a table ( load(g), pointer reading R2(cm), Extension (e= R2-R1)cm. 5. Plot a graph of extension against load.(look in hint) .(look in hint) |
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Why are spring balances very useful in measuring forces? |
Spring balances are very useful in measuring forces because of the elastic property of springs. |
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What is the weight in outer space? |
The weight in outer space is 0 N. |
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What happens from P to L and over L and why? |
P to L is known as the elastic limit. Beyond the elastic limit, the spring will not return to its original lenght when the load is removed (deformed permanently) usually because the stretching force is large. |
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