Elasticity and Hooke's Law

Try these questions

5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.

1. 1. A spring obeys Hooke's Law. When the stretching force on it is tripled, and the elastic limit is not exceeded, what happens to the extension?

   • A. It stays the same
   • B. It becomes three times larger
   • C. It becomes nine times larger
   • D. It becomes one third as large

2. 2. A helical spring has an unstretched length of 12.0 cm. When a load of 3.0 N is hung from it, its length becomes 18.0 cm. Calculate the spring constant k of the spring.

   Type your answer (in N/m) in the lesson.

3. 3. A spring is stretched beyond its elastic limit and then the load is removed. What is observed?

   • A. The spring returns exactly to its original length
   • B. The spring becomes stiffer and shorter than before
   • C. The spring does not return to its original length because of permanent plastic deformation
   • D. The spring's extension is still directly proportional to the force

4. 4. A force-extension graph is plotted for a spring, with force on the vertical axis and extension on the horizontal axis. The straight-line part of the graph has a steep gradient. What does this tell you about the spring?

   • A. It has a large spring constant and is stiff
   • B. It has a small spring constant and is soft
   • C. It has already passed its elastic limit
   • D. It has no elasticity

5. 5. What name is given to the maximum load a spring can carry and still return to its original length when the load is removed? Give the two-word term.

   Type your answer in the lesson.

More in Mechanical Properties of Materials

• ▸Transmission of Pressure in Fluids
• ▸Applications of Fluid Pressure
• ▸Environmental and Historical Applications of Pressure
• ▸Mechanical Properties of Materials
• ▸Understanding Tensile Stress
• ▸Understanding Tensile Strain
• ▸Modulus of Elasticity and Young's Modulus
• ▸Stress Strain Curves and Material Failure

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