Unit 2 - Springs Flashcards
What type of energy is stored in a stretched spring?
Elastic potential energy.
If the extension of a spring is 20cm and the weight added is 30N, what is the spring constant? F = k xInclude the correct unit.
30 = k x 0.2K = 150 N/m
Define spring constant.
The force needed to stretch a spring a unit of distance. N/m one metre or N/cm one cm.
What does a straight line through the origin on a force extension graph tell you?
The extension of a spring is directly proportional to the force acting on it. This is called Hooke’s Law.
What can you say about an elastic object when the line on a force extension graph is no longer straight?
The object has exceeded it’s elastic limit. It will no longer return to its original length.
What does the gradient of a force extension graph tell you about an elastic object?
Its spring constant. The steeper the gradient the larger the force constant.
If it takes 40N of weight to extend a spring 20cm how much work has been done of the spring include the unit. (work done = force x distance)
40 x 0.2 = 8J.
