Lifting

Lifting is the act of raising an object from a lower position to a higher one, typically against gravity. It is a basic human ability and a common operation in many activities, occupations, and machines. The effort required depends on the object's mass, how high it must be moved, and the path taken; friction and the efficiency of equipment also influence the energy involved.

In physics and engineering, lift refers to an upward force that opposes weight. In aviation, aerodynamic lift is produced when air flows over and under a wing, creating a pressure difference that supports the aircraft in flight. Lift devices such as cranes, forklifts, hoists, and jacks use mechanisms like pulleys, hydraulics, or motors to move loads vertically.

In sport and fitness, lifting denotes strength-training activities involving weights. Olympic weightlifting features the snatch and the clean and jerk, emphasizing speed and technique. Powerlifting centers on the squat, bench press, and deadlift, focusing on maximal load. Safe lifting requires proper technique, progressive loading, warm-up, and appropriate equipment.

In industry and construction, lifting is essential for material handling, shipping, and rescue operations. Operators follow safety standards for equipment inspection, load limits, signaling, and training to reduce injury risk. Lifting also involves the use of mechanical aids and planning to manage balance, stability, and energy efficiency.