Physics Flashcards
(26 cards)
What is Hook’s law?
The extension of an elastic object is directly proportional to the force applies ( extension ×2 force ×2 or 0 extension =0 force.
How can you investigate Hooke’s law?
1Hang the spring from a stand then measure its length with a ruler.
2.Hang a mass from he spring and measure the new length of the spring.
3.Work out the extension= new length - original length.
4. Keep adding more masses , measuring the new length each time then work out the extension for each mass. (Extension on the x axis)
What is a moment?
Is a turning effect on a force. Forces can make objects turn if there is a pivot.
How to calculate the moment :
Moment = force × distance
Nm=n×m
What is deformation?
Is a change in shape when a force is exerted on them and then they return to their original size when the force is removed.
What are elastics?
They change shape when a force is exerted on them and return to their original size when force is removed
Example of simple machines:
See-saw = when a force is exerted in one place, causing movement and a force at another place in the see saw.
Wheelbaroows- is the wheel is the pivot and the load is put near there, and the effort is on the handles far from the pivot
What is a pivot?
A fixed centre of rotation (for example a wheel on a wheelbarrow or the round part of the forceps)
What is a lever?
They allow forces applied to be multiplied through rotation around a pivot. It is a simple machine ( seesaw)
Which store increases when an elastic object is stretched or squashed?
The elastic potential
How is Work done calculated?
Work done = force × distance
J (joules) = newton’s × metres
What is the equation Linking force extension and spring constant?
Force = spring constant × extension
N= n/m × m
What is the force?
An interaction between 2 objects that pulls or pushes the objects together
What is the resultant force?
The single overall force.
What is extension?
The measure of how much an elastic object has been stretched.
Wha ti’s compression?
The measure of how much an elastic object has been squashed
What is the difference between between an elastic and inelastic object?
An elastic object is an object that can be squashed or compressed and can return to its original shape and size however an inelastic object is an object that can not return to its original shape and size after it has been squashed or compressed.
What is direct proportion?
When the IV and DV are related because if the IV doubles the DV doubles too.
What is elastic potential energy?
The store of energy in extended and compressed objects.
What is work done?
The energy transferred when a force moves an object
Explain newtons second law:
A resultant force acting on an object causes acceleration, depending on the size of the resultant force and the mass of the object (resultant force = mass × acceleration)
What is the effort?
Where the force applied to the lever (the handles most of the tine)
When the force is removed from a stretched object, to which energy store is the elastic potential energy transferred?
Kinetic energy store
When does an object balance?
When the moments are equal.
