Energy Conversion in a Bungee Jump
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Description:
A great way to see energy conversion in action is with
a bungee jump.
¿¡³ÊÁö ÀüȯÀ» ½ÇÁ¦·Î º¼ ¼ö ÀÖ´Â ÁÁÀº ¹æ¹ýÀº ¹øÁö Á¡ÇÁ¸¦ ÇÏ´Â °ÍÀÔ´Ï´Ù.
Transcription:
Narrator: A great way to see energy conversion in
action is with a bungee jump.In Queenstown, New Zealand—the home of bungee
jumping—a jumper stands almost 100 meters above the freezing water below, ready
to leap from a bridge. Attached to the jumper's feet is an elastic cord which
is secured to the bridge.
On the bridge, the jumper holds a huge amount of
gravitational potential energy. This is energy stored due to height. The
greater the height, the more potential energy.
When the jumper dives, the potential energy quickly
transforms into kinetic energy, the energy of motion. The jumper accelerates
toward the water, gaining speed as gravity pulls them downward. As the fall
continues, kinetic energy increases while gravitational potential energy
decreases.
As the jumper nears the water, something remarkable
happens. The bungee cord begins to stretch, creating elastic potential energy.
The cord absorbs the motion, acting like a giant spring.
At the lowest point, the jumper briefly stops. All of
the kinetic energy has been transferred into elastic potential energy stored in
the stretched cord.
The cord then pulls back, converting the stored
elastic energy back into kinetic energy and sending the jumper soaring upwards.
As the jumper rises, gravitational potential energy increases again while
kinetic energy decreases. Each bounce converts energy back and forth between
kinetic, elastic, and gravitational forms, gradually losing energy as the
jumper comes to rest.
A bungee jump is an exciting and clear example of
energy changing forms: from gravitational potential, to kinetic, to elastic,
and back again.
Let¡¯s watch the jump one more time. Watch as energy
transforms from one form to the next.
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Questions:
1. What forms of energy are involved during a bungee
jump?
2. How does gravitational potential energy change as
the jumper falls and then rises again?
3. What role does the elastic cord play in energy
transformation during the jump?