Friday, November 3, 2023 at 12:55 PM
If you : - are sitting on a swing set - your feet are not touching the ground - you are perfectly immobile. It is impossible to start the swing. No matter what you do with your arms and legs you cannot start the swinging. You need an initial swing that you can then amplify with your legs. You need an external force to initiate the swing (usually by touching the ground with your feet or by being pushed by someone).