5.5 超重与失重 课件-2021-2022学年高一物理鲁科版（2019）必修第一册

鲁科版2019物理必修一 5.5超重与失重 高一物理 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance. 趣味实验 一根细线下面挂上重锤，用一只手让细线断开。 失重：物体对悬挂物的拉力小于物体所受重力的现象。 超重：物体对悬挂物的拉力大于物体所受重力的现象。 试一试 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance. 超重与失重现象 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance. 超重与失重现象 超重：物体对悬挂物的拉力（或对支持物的压力）大于物体所受重力的现象。 失重：物体对悬挂物的拉力（或对支持物的压力）小于物体所受重力的现象。 现象总结 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance. 超重与失重产生的条件 运动方向 运动情况 T’(N’)与物体重力的大小关系 现象 a方向 向上 静止 加速 匀速 减速 静止 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance. 超重与失重产生的条件 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance. 超重与失重产生的条件 运动方向 运动情况 T’(N’)与物体重力的大小关系 现象 a方向 向上 静止 加速 T’(N’)＞G 超重 ↑ 匀速 减速 T’(N’)＜G 失重 ↓ 静止 向下 加速 匀速 减速 静止 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance. 完全失重现象 思考：当电梯以加速度a向下加速运动时，质量为m的人对电梯的压力是多大？如果a=g，压力是多大？ 当物体对支持物的压力（或对悬挂物的拉力）等于0时，我们称物体处于完全失重状态。 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance. 航天器中的超重与失重 Life is not about waiting for the storm to pass, its about learning to dance. <鲁科版必修1> Life is not about waiting for the storm to pass, its about learning to dance.