What sort of trade-offs do you think engineers make between functionality, safety, and aesthetics when building a real bridge?

They make sure the bridge is functional and safe before the add the 
aesthetics

This is what i found on google “kinetic energy. energy is transferred from one object to another when a reaction takes place. energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. this energy would be in the form of motion, with the person lifting the blue ball to a higher level.” i hope this you