First of all, from the perspective of Newton's classical mechanics, if we stand on the bus and have direct contact area with the bus, we will exert a force on the bus, so the gravity of our weight must be borne by the bus. At this time, if we all jump up suddenly, there will be no contact area between us and the bus for at least one second, so there will be no force. For example, a necessary condition of force is contact. Just like when we hit a person, others feel pain because of the contact area. If we don't touch it, no matter how powerful we are, we won't feel any change.
So I think a driver in Shenyang can direct passengers to jump up to reduce the weight of the car, and it can really reduce the weight in one second. This situation is generally that the bus is overloaded and cannot be started temporarily. You can try this method at this time.
To tell you the truth, don't get on the bus when you see it is full. At this time, the load on the bus is so heavy that even the bus can't start. This is unnecessary. At present, there is basically a bus every 20 minutes, just wait for the next one. Many buses can be transferred without blocking themselves.