inventions
Ramps, wheels, and levers help us lift and move heavy things with less effort.
Simple machines is correct — that's the name for basic tools like ramps, wheels, and levers that make lifting and moving heavy things easier, even though they don't have any engines or motors of their own.
Soft toys and loud noises aren't tools that help you do physical work at all, so neither one fits this description of ramps, wheels, and levers making tasks easier.
A doorknob, a pair of scissors, and even a bottle opener are all everyday examples of simple machines working quietly behind the scenes to make your life a little easier.
inventions
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