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Complete answer: In nature, a rubber band is an elastic substance. It changes shape when extended and returns to its original shape when the applied force is withdrawn. Elasticity is described as the ability of a substance to stretch and return to its original shape after being stretched.
What happens if you stretch 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 a rubber band is stretched it has what force?
When an elastic material is stretched or compressed, it exerts elastic force. This force increases the more the material is stretched or compressed. Elastic force has many uses, from hair scrunchies to bed springs.
What happens to entropy when rubber band is stretched?
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 happened to the rubber band after stretching it and letting it go?
Item NG007004: When you let go of a stretched rubber band, the elastic energy that the rubber band has when it is stretched is converted into motion energy. The elastic potential energy of the stretched rubber band was converted into kinetic energy (motion energy) when the student let it go.
What happens when you 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.
Why does rubber band heat up when stretched?
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.
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.
Is stretching a rubber band push or pull?
The rubber band is being stretched out. The rubber band wants to push back to compress size that then creates a force that pulls both ends of then rubber band. In conclusion, tensional force is a force that pulls a wire, cable or string in two opposite directions.
What is the K value of a rubber band?
Spring constant of the rubber band is k=45.0N/m.
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 rubber is stretched?
Natural rubber is made of long chains of molecules called polymers. Because these polymers are so long (they can be thousands of molecules long) they get tangled up in themselves. When you stretch the rubber, the polymers start to elongate or stretch.
Does rubber band absorb water?
Despite the fact that pure hydrocarbon rubbers intrinsically absorb very little water (less than 1 part in 1000), most rubber vulcanizates will, in time, absorb several per cent.
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 kind of energy is stored in the rubber band?
A stretched rubber band has the potential to do work or change things. This form of energy is called elastic potential energy. It occurs when an object (such as our skin, a spring, a trampoline, or a rubber band) resists being stretched out of shape. The elastic potential energy in a rubber band can be used to do work.
When you stretch a rubber band What is the energy generated and lost?
Answer: It gains elastic potential energy, while the object that stretched it losses energy. Band is released from the stretched position: it losses its stored elastic potential energy.
How can I permanently stretch rubber?
Run a blow dryer on high-heat over the boots to loosen the material. Take a blow dryer set to high-heat and hold it about 6–8 inches (15–20 cm) away from the surface of the boots. Keep the blow dryer constantly moving over the boots to heat up and loosen the rubber material so they stretch out.
Does rubber shrink when heated?
The rubber band actually expands when it gets colder! This occurs because of the unusual polymer structure of rubber. When the long chains get hotter and vibrate, they actually shorten, causing the material to contract. When the chains cool down, they relax and stretch out, causing the material to expand.
Why does a rubber band break after using it many times?
In natural rubber, oxygen exposure will begin to break down the double bonds within days, leaving a crumbly mess; that is why rubber has been heated and treated for thousands of years – to slow the inevitable breakdown.
Can rubber be stretched?
Rubber elasticity refers to a property of crosslinked rubber: it can be stretched by up to a factor of 10 from its original length and, when released, returns very nearly to its original length. This can be repeated many times with no apparent degradation to the rubber.
Why does rubber absorb heat?
An object feels cool or cold to you when heat flows from your skin to the object. If the stretched rubber band feels cool, then it absorbs heat from your skin. If it feels warm, then it gives off heat to your skin. If the band feels neither warm nor cool, then there is no detectable heat flow.
What extends the life of a rubber band?
Another way to extend life is to change the color; adding carbon black prolonges the life of rubber substantially (Protection from light) and by adding antioxidants. The background of embrittlement of polybutadiene (polyisoprene) based rubbers is crosslinking by radical chain reactions with oxygen.
