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失重和超重是在实重和视重对比之下而得到的.所谓实重是指G=mg所确定的物体的重量,而视重是指人由弹簧秤等量具上所看到的物体的重量.当视重大于实重,即当物体对支持物的压力或悬挂时对绳的拉力大于物体所受的重力时,便称物体处于超重;当视重小于实重,即当物体对支持物的压力或悬挂时对绳的拉力小于物体所受的重力时,便称物体处于失重;而当视重等于零时,即当物体对支持物的压力或悬挂时对绳的拉力等于零时,便称物体处于完全失重.
Weightlessness and overweight are obtained by comparing the actual weight with the apparent weight. The so-called actual weight refers to the weight of the object determined by G=mg, and the apparent weight refers to the weight of the object seen by the person on a spring scale. When the weight is heavy and heavy, that is, when the object’s stress on the support or when the tension on the rope is greater than the weight of the object, the object is said to be overweight; when the apparent weight is less than the actual weight, that is when the object is on the support. When the pressure or hanging force on the rope is less than the weight of the object, the object is said to be weightless; and when the apparent weight is equal to zero, that is, when the object’s pressure on the support or suspension when the tension on the rope is equal to zero, it is called The object is completely weightless.