You are pushing down with the weight mg, and the floor has got to be pushing up with the mg, because the spring is not going anywhere.

你向下的作用力是重力 mg,然后地面向上的支持力也是 mg,因为弹簧现在根本没动

耶鲁公开课 - 基础物理课程节选

Like a spring with a heavier weight at one end, the vibration frequency is lowered, and flies appear to notice.

BBC: Quantum physics explanation for smell gains traction

The use of a rechargeable battery, which can be charged up with energy from the spring several times, and then occasionally topped up during use, dramatically reduces its size and weight.

ECONOMIST: Clockwork technology