Final answer:
True, the lack of a machine guard in a shipping area does allow kinetic energy to create an unnecessary risk, as uncontained moving objects such as parcels can become hazardous when they fly off and impact workers.
Step-by-step explanation:
True. If a parcel flies off the conveyor belt and hits Jeremy in the shoulder, this would indeed be an example of how the lack of a machine guard allows kinetic energy to create unnecessary risk. When machine guards are absent, there's nothing to contain or redirect the energy of moving objects, which can then lead to accidents. The nature of kinetic energy is that it is the energy of motion. If an object, like a parcel on a conveyor belt, has been accelerated by a force (as described with a force application (Fapp) of 120 N), it acquires kinetic energy. When there's friction involved, it does work against the motion, reducing kinetic energy, but a frictionless system or an insufficiently guarded machine can result in the energy not being safely dissipated. Consequently, an object like a parcel can detach and strike someone, causing potential injury due to the conversion of potential energy into kinetic energy as the object moves and then impacts.