force and extension: RP

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

  Investigate the relationship between force and extension
• 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?

  The length with no force attached
• What weight is first hung on the spring?

  One newton
• How do you calculate the extension produced by each weight?

  Subtract unstretched length from each reading
• What do you need to plot against the weight?

  Extension
• What type of graph is produced from the spring experiment?

  A straight line through the origin
• What does a straight line graph indicate about force and extension?

  Extension is directly proportional to weight
• What is the term used for a linear relationship?

  Linear
• How does the graph for a rubber band differ from that of a spring?

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

  The graph becomes nonlinear
• What is inelastic deformation?

  Extension remains after weight is removed
• 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
• What is the significance of the straight line graph in the context of springs?

  It indicates elastic behavior of the spring