RP 6

• What should you be able to describe by the end of the video?

  Investigate the relationship between force and extension
• Why is it important to learn the details of this practical?

  It is a required practical for exams
• What equipment is needed for the experiment?

  Clamp stand, bosses, clamps, meter rule, spring
• Why must the meter rule be vertical?

  To ensure accurate readings
• What must the pointer at the bottom of the spring be?

  Horizontal
• What does the unstretched length of the spring represent?

  Length with no force attached
• How do you determine the extension produced by a weight?

  Subtract unstretched length from new length
• What is the extension produced by a 1 Newton weight?

  4 cm
• What is the extension produced by a 2 Newton weight?

  8 cm
• What is the extension produced by a 3 Newton weight?

  12 cm
• What do you plot on the graph to analyze the results?

  Extension against weight
• What is the extension produced by a 4 Newton weight?

  16 cm
• What does a straight line graph through the origin indicate?

  Extension is directly proportional to weight
• What is meant by a linear relationship?

  A relationship that produces a straight line
• How does a rubber band behave differently than a spring?

  It does not produce a straight line graph
• What happens to the spring when too much weight is added?

  It becomes nonlinear and overstretched
• What is inelastic deformation?

  Extension remains after removing weight
• What is the limit of proportionality?

  The maximum weight for linear extension
• What equation is used to calculate the force required to extend a spring?

  Force = spring constant × extension
• How is the spring constant determined from the graph?

  By dividing force by extension
• When is the spring constant the same for any part of the graph?

  When not exceeding the limit of proportionality
• Where can you find questions on this required practical?

  In the vision workbook