moments and elasticity Flashcards
1
Q
What is a moment?
A
A turning effect produced by a force
2
Q
What is the centre of mass?
A
Point at which weight force acts through
3
Q
When do objects balance?
A
When the CoM above pivot
4
Q
Is an object with a high CoM more stable than an object with low CoM?
A
No, its more unstable
5
Q
What happens when objects are unstable?
A
They will topple
Weight force outside base
Causes a moment
6
Q
What happens when a force is removed from an elastic object?
A
The object will go back to normal
7
Q
What happens when a force is removed from a plastic object?
A
Object does not go back to normal
Permanently damaged
8
Q
What are rubber bands made out of?
A
Tangled, long polymer chains
9
Q
What is hysteresis?
A
Delayed response of polymer chains in rubber band tangling back again Energy stored (space) between loading and unloading lines on force/extension graph
10
Q
Example of ductile material?
A
Chewing gum
Molten cheese
11
Q
Example of brittle material?
A
Crisps
