What happens to the potential energy of a squashed ball as it regains its shape?

April 09, 2022 Post a Comment

Why Does A Safe Ball Bounce Back While An Iron Ball Doesn't?

Updated on: 19 Jan 2022 by Rujuta Pradhan

Whether entertaining yourself on a rainy afternoon by bouncing a ball off the wall or watching an exciting game of baseball game, nosotros've all been entertained in countless ways by this banal spherical toy. The most enjoyable of all, however, may be bouncing a rubber ball with a lot of force and watching it careen in all directions. Unfortunately, you can't have near as much fun with a plastic or metal ball.

That begs the question, of grade, what makes a condom ball so special? Why are rubber balls the ultimate bouncing toys? In that location are two factors that contribute to bounciness; i is the elasticity of the material out of which the ball is made and the other is related to the interaction between the force at which information technology is bounced and that elasticity.

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What Makes Rubber Elastic?

Elasticity refers to the readiness/quickness with which a cloth returns to its original shape after being compressed or stretched. Rubber is made of long tangled strings of carbon attached at different points along its length to other strings of carbon. Every bit such, safety has very strong molecular bonds. The long molecular chains of safety can physically rotate around the chemical bonds that hold them together, which results in the property of flexibility. This helps rubber to momentarily deform its shape without breaking. Since the molecular bondage are cross-linked, safe tin can chop-chop return to its original shape subsequently deformation.

source: "RubberSyn&Natural" by Smokefoot - Own work. Licensed under CC BY-SA 3.0 via Commons - https://commons.wikimedia.org/wiki/File:RubberSyn%26Natural.png#/media/File:RubberSyn%26Natural.png

source: "RubberSyn&Natural" by Smokefoot – Own work. Licensed under CC By-SA three.0 via Eatables https://eatables.wikimedia.org/wiki/File:RubberSyn%26Natural.png#/media/File:RubberSyn%26Natural.png

The Physics of Falling

Whenever an object is lifted off the ground and raised to a certain peak, work is washed confronting the weight of the object, which is stored as potential gravitational energy. When the object – in this example a prophylactic ball – is released and falls to the ground, the strength of gravity acting on the ball causes it to accelerate, converting potential energy into kinetic energy. Just before the ball collides with the surface, all the potential free energy is converted into kinetic free energy.

At the molecular level, when the brawl comes in contact with the surface of the ground or wall, the molecular strands of the ball are compressed or squashed by the downwardly forcefulness acting on information technology, coupled with the upward forcefulness exerted past the footing. The ball changes shape from a circle to an oval. As the ball changes shape, the force produced by the bonds, which concur the different strands of rubber together, becomes larger.

Changes Later Bear on

Upon impact, the ball comes to an abrupt halt, but nevertheless possesses a slap-up amount of kinetic free energy. Some amount of energy that the ball contains is absorbed past the surface, but the remaining has to go somewhere, and so it is stored every bit elastic energy. Once again at the molecular level, the downward force on the strands decreases, while the strength exerted by the bonds increases, which results in the strands regaining their original shape. It takes a very short time for the brawl to come up to a consummate stop, after which the elastic free energy of the brawl is released and the brawl enacts a strength on the basis. At that place is an equal and opposite strength on the brawl in the upward direction (Newton's Third Law), which makes it bounce. The conversion of elastic energy to kinetic makes it rise against the ground. In other words, it bounces dorsum into the air!

In example of a plastic or metal ball, the material is non elastic, although it has the same amount of kinetic free energy. The surface that the brawl strikes will absorb most of the energy upon impact and since the material is non-elastic, it will non be compressed or reshaped, which would give it the required amount of force to rise (bounce). Also, the transfer of kinetic free energy to the surface the wall volition lead to a dent or a hole in the wall, since the force has nowhere else to go!

The surface besides matters. If the same condom brawl is bounced off a carpet, it won't rise or bounce to the aforementioned top every bit when bounced on solid ground. The time it takes for the ball to come to remainder is longer, due to the compressibility of carpet, which ways that more force is transferred to the carpet, thus leaving less force for the "bounce dorsum".

Now that you lot know the scientific discipline of elasticity, try bouncing a few things off your walls and see what happens!