When stretched the polymer strands
should be more aligned and straighten out along the direction of the stretching
. When you relax it the strands go in all directions, or become more disordered. For this change the entropy increases, which means the heat is positive.
What happens when a rubber band is stretched force?
A rubber band is an elastic material in nature. When stretched,
it changes its shape and when the applied force is removed, it regains its original shape
. That is why a rubber band changes its shape even though it is a solid. Also, if excessive force is applied then the rubber band would break.
Does the entropy of a rubber band increase or decrease when stretched?
The cooling effect means that it is an endothermic process
What increases when you stretch rubber band?
You input potential (stored)
energy
into the rubber band system when you stretched the rubber band back. Because it is an elastic system, this kind of potential energy is specifically called elastic potential energy. … When the rubber band is released, the potential energy is quickly converted to kinetic (motion) energy.
Why does a rubber band resist stretching?
Rubber is made of molecules shaped like strands of spaghetti. If you stretch a rubber band, you pull those spaghetti-shaped molecules into a more or less straight line. But
the molecules are still moving around
. … That motion causes the molecules to resist straightening.
What happen when you stretch the paperclip?
If we bend the paper clip just a little, it snaps back to its original shape. … Stretch or bend certain metals (like, for example, the hardened steel of hacksaw blades) and, instead of deforming like paper clips, they just
go plink — they break in
two all at once.
What happens when we stretch the rubber bands will it become longer or shorter Why?
As the rubber is stretched the bonds between adjacent chains are broken. Stretching a rubber band makes
it get hot – heat energy is lost
. Therefore if you put heat energy into a rubber band it will get shorter – unlike most materials when they are heated.
How much can a rubber band stretch?
How much does silicone rubber stretch? Some Silicone rubbers can stretch up to
1000%!
(That's about 100x its original length!) Typically the softer the silicone the more it stretches, 20 shore will stretch a lot more than an 80 shore grade.
Why does the length of the rubber band increases as each mass is added?
If you get hold of a rubber band and pull it you are using a
force on it
. That force makes the rubber band get longer – it stretches. The greater the pull the longer it gets. In other words a bigger force makes the rubber band stretch more.
What happens when we stretch a rubber band the elastic potential energy of the rubber band?
You
input potential (stored) energy into
the rubber band system when you stretched the rubber band back. Because it is an elastic system, this kind of potential energy is specifically called elastic potential energy. … When the rubber band is released, the potential energy is quickly converted to kinetic (motion) energy.
What did you have to do in order to stretch the elastic band and keep it stretched?
What did you have to do in order to stretch the elastic band and keep it stretched?
The elastic band had to be pulled hard by the learners and they cannot let go if they want to keep it stretched
. Energy is transferred from the elastic band to the matchbox and the matchbox moves.
Why does a rubber band become warm when you stretch it repeatedly?
When
molecules, not just rubber molecules, but any molecules, form crystals, they give off heat
. This is why the rubber band feels hot when its stretched. When you let go of the rubber band, the polymer molecules break out of those crystals. Whenever molecules break out of crystals, they absorb heat.
Can you harden a paperclip?
Firstly, bending the paper clip back and forth produces an effect on the metal known as
work hardening
. As you do more work on the metal, it becomes harder and more brittle. Eventually, it will become so brittle that it will snap, and this is why you can snap a cheap spoon simply by bending it back and forth.
What happen to materials when bent?
When solid materials are bent, pressed, or hammered experience
a physical change
. In physical change only the appearance of a substance or object changes, not its chemical structure. A physical change does not make a different substance or object. Examples of physical change include changes in size, shape, and state.
What happens to the silver spoon when bent?
The spoon can be bent. It is a physical change because it does not change the composition or properties of the particles that make up the spoon. The
spoon can be cooled down or heated up to a few degrees
.
What kind of energy is stored in the rubber band?
You input potential (stored) energy into the rubber band system when you stretched the rubber band back. Because it is an elastic system, this kind of potential energy is specifically called
elastic potential energy
.
