Children Outdoor Swing for Playground
The movement of a swing is similar to the movement of a pendulum. When the swing is swinging from the lowest point to the highest point, gravity makes a negative work, and the kinetic energy of the system is converted into the potential energy of the system. When the swing swings from the highest point to the lowest point, the potential energy of the system is converted into the kinetic energy of the system. The mechanical energy is conserved throughout the process, and the swing will swing in equal amplitude.
If you want the swing to swing higher and higher, you must use external force. You can swing the swing yourself, there is no way to use the external force, and the system cannot obtain energy from the outside world. The internal energy can only be converted into the mechanical energy of the system by the swinger and the internal force of the rope, and the internal force can only be achieved by the person standing on the swing or crouching down.
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