Final answer:
Machines can contain both kinetic and potential energy, which pose hazards if not managed.
Explanation:
Kinetic energy is the energy associated with objects in motion, such as machinery movements and wind currents. On the other hand, potential energy is stored energy that can be found in objects like stretched rubber or water held behind a dam. Machines can contain both kinetic and potential energy, making them hazardous if not properly controlled.
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