Force and Extension

• What is the aim of the experiment described?

  Determine correlation between mass and spring extension
• What equipment is needed for the experiment?

  • Spring (extending over 1cm at 1N)
  • Metre Rule
  • Suitable Pointer (splint and tape)
  • Weight Stack (10 x 10g masses)
  • Clamp Stand
  • Two clamps and bosses
  • G-Clamp or additional weight
• Why must the spring return to its original dimensions?

  To ensure it operates within its elastic limit
• How should the pointer be attached to the spring?

  It should be parallel and perpendicular to the ruler
• What is the first step in the method?

  Set up your equipment properly
• What should be measured before adding weights?

  The initial length of the spring
• What should be done after adding each weight?

  Record the length of the spring
• How do you calculate the extension of the spring?

  Subtract initial length from each length
• What is the formula to convert mass to weight?

  Weight (N) = mass (kg) x 9.81 (N/kg)
• What does the gradient of the force vs. extension graph represent?

  The spring constant measured in N/m
• What indicates that the spring obeys Hooke’s Law?

  The graph is linear and passes through the origin
• What is the gravitational field strength on Earth used in calculations?

  9.81 N/kg
• If the spring's initial length is 10 cm and it extends to 12 cm, what is the extension?


  2 cm
• What are the steps involved in the experiment's method?

  1. Set up equipment properly
  2. Attach pointer correctly
  3. Measure initial spring length
  4. Add 10g mass and record length
  5. Repeat with additional masses
  6. Calculate extension for each mass
  7. Convert mass to weight using formula
  8. Plot graph of force vs. extension and calculate gradient