Elastic potential energy

• What is the first equation related to elasticity mentioned in the video?

  F = ke
• What does the variable K represent in the equation F = ke?

  K is the spring constant
• What does a lower spring constant indicate about an object?

  It is more elastic and easier to stretch
• What does a higher spring constant indicate about an object?

  It is stiffer and harder to stretch
• What is the second equation related to elastic potential energy?

  Elastic potential energy = $\frac{1}{2} ke^2$
• What does elastic potential energy represent?

  Energy transferred to an object as it stretches
• If 100 joules of energy is used to stretch a spring, what happens to that energy?

  It is transferred to the spring's potential energy
• How do you calculate the extension of a spring?

  Subtract natural length from stretched length
• How do you find the spring constant using the equation F = ke?

  Rearrange to K = F / E
• What is the extension of a spring that stretches from 0.6 m to 0.8 m?

  0.2 m
• What is the spring constant if a force of 14 N causes an extension of 0.2 m?

  70 N/m
• How do you calculate the elastic potential energy of a spring?

  Use $U =$$\frac{1}{2} ke^2$
• What is the elastic potential energy of a spring with K = 70 N/m and E = 0.2 m?

  1.4 joules
• What does a graph of force against extension indicate about a spring?

  • Gradient represents the spring constant
  • Area under the curve equals elastic potential energy
• What is the elastic limit in relation to Hooke's law?

  It is when the object stops obeying Hooke's law
• What happens to the energy when a spring is released after being stretched?

  It converts back to kinetic energy
• How does the concept of elastic potential energy relate to the work done on a spring?

  Work done equals energy stored in the spring