P9 Forces and their Effects Flashcards
When does inelastic deformation occur?
When an object does not return to its original shape after being deformed
What is a spring constant?
A measure of a spring’s stiffness
A stiffer spring has a _____ spring constant.
Greater
What is the limit of proportionality of an object? (related to stretching/compressing)
The maximum amount of force you can apply for the extension to remain proportional to the force
Why do you need to apply more that one force to deform an object?
The object would just move unidirectionally otherwise.
What is a moment?
The turning effect of a force
What is the equation for moments?
Force * Perpendicular distance from the line of action to the pivot
Why does it take more force to achieve the same moment on a smaller spanner?
The perpendicular distance to the pivot is smaller
What happens to an object when its anticlockwise moment is equal to its clockwise moment?
It becomes balanced and doesn’t turn
What is a gear and what purpose does it serve?
Circular discs with interlocking teeth around the edges. Their role is to transfer moments.
What happens if you drive a gear using a smaller gear?
The turning effect will be smaller.
Where does the force exerted by fluid pressure act relative to a surface?
perpendicular/at the normal
What is the equation for pressure?
F=pA
True or false- liquids have a uniform density
true
Name a factor that affects liquid pressure:
Depth- as depth increases, so does pressure, as the weight of particles higher up exerts force onto those below
