本题目来源于试卷: gc physics textbook chapter 6 problems，类别为 IB物理学
[问答题]
Describe the energy tra ,galiv fe9s*ls s/0/qnsfor6v.hgzd1 )xhbmations when a child hops around on a pogo stick.
参考答案:
Start the description with the child suspended
in mid-air, at the top of a hop. All of
the energy is gravitational PE at that point.
Then, the child falls, and gains kinetic energy. When the child reaches the ground, most of
the energy is kinetic. As the spring
begins to compress, the kinetic energy is changed into elastic PE. The child also goes down a little bit further
as the spring compresses, and so more gravitational PE is also changed into
elastic PE. At the very bottom of a hop,
the energy is all elastic PE. Then as the
child rebounds, the elastic PE is turned into kinetic energy and gravitational
PE. When the child reaches the top of
the bounce, all of the elastic PE has been changed into gravitational PE,
because the child has a speed of 0 at the top.
Then the cycle starts over again.
Due to friction, the child must also add energy to the system by pushing
down on the pogo stick while it is on the ground, getting a more forceful
reaction from the ground.
本题详细解析:
暂无
| 
