Background Paragraph: Something that is elastic can return to its original shape after being stretched or compressed. This property is called elasticity . As you stretch or compress an elastic material like a bungee cord, it resists the change in shape. It exerts a counter force in the opposite direction. This force is called elastic force . The farther the material is stretched or compressed, the greater the elastic force becomes. As soon as the stretching or compressing force is released, elastic force causes the material to spring back to its original shape. You can watch a demonstration of elastic force at this URL:. 
Story: Michael is planning on playing a prank on his older brother. He is going to take a bungee cord and stretch it and then release it so that it hits his older brother as he is sleeping.  He is deciding whether to stretch the cord only partially or completely before releasing it.
Will stretching the bungee cord partially or completely result in less force when it's released? Will stretching the bungee cord partially or completely result in more force when it's released? Will the bungee cord resist further stretching less when it's stretched partially or completely? Will the bungee cord resist further stretching more when it's stretched partially or completely?