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冲量是描述力对时间累积效应的物理量,其定义式I=F·t,只适用于求恒力的冲量.如果在时间t内,作用在物体上的力是变化的,就要把整个运动过程分成很多很短的时间间隔△t,以至在△t时间内,可以认为力是不变的,用这段时间里的作用力乘这段时间,则力的冲量为Fi△t.t时间内力的冲量等于这些小段力的冲量的矢量和I=∑Fi△t.在具体求解时有多种方法,本文结合例题做一归类探究.
Impulse is a physical quantity describing the cumulative effect of force on time. Its definition formula I=F·t applies only to the impulse of constant force. If the force acting on the object changes during time t, the entire motion must be taken. The process is divided into many very short time intervals, Δt, so that within Δt time, the force can be considered as constant. Using this time’s force to multiply this time, the impulse of the force is the force of the force of FiΔtt. The impulse is equal to the vector sum of impulses of these small forces. I = ∑Fi △t. There are multiple methods in the concrete solution. This article combines the example questions into a classification.