Hooke's Law Flashcards
Describe the energy transfers which cause a spring to stretch and then regain form.
A force causes the shape of the object to stretch, (or squash). This means work is done on the object, therefore energy is transferred into elastic potential energy. This is transferred into kinetic energy when the applied force against the resisting force is removed, making the spring regain its former shape. That is until the limit of proportionality is reached.
Extension is …….. To the force applied
Directly proportional
Describe Hooke’s law
This describes how the extension of a spring is proportional to the force applied through slotted masses. The greater the force, the larger the extension.
Force (F,N) = spring constant (K, N/m) * extension (m)
The spring constant is the elasticity.
The greater the spring constant the more ….. The spring is.
Stiff, as it is more able to regain its former form.
The more elastic an object is the smaller the …. For the same force.
Extension.
How is the spring constant calculated on a graph?
Divide the applied force (N) by the extension (m).
What will the graph look like until the point of proportionality is reached ? How about after ?
Before the graph will show direct proportion. As the force increases, so does the extension. At a certain point of the extension, the limit of proportionality is reached and beyond this point, a slope is reached as the extension increases at a faster rate than the force. The extension can never reach zero beyond this point again so Hooke’s Law cannot apply!
Who came up with Hooke’s Law?
Robert Hooke in 1678.
What is a modern example of Hooke’s law?
Car suspension stores energy, as the energy from the shock of bumps when a car is driving is absorbed to reduce the impact on the car.
