物理知识点（英文+中文）【范围：高一至大一】自由落体运动

The speed of a falling object is not proportional to its mass.

all objects would fall with the same constant acceleration in the absence of air or other resistance.

at a given location on the Earth and in the absence of air resistance, all objects fall with the same constant acceleration.

g = 9.80 m􏰀/s^2 

Acceleration due to gravity is a vector, as is any acceleration, and its direction is down ward toward the center of the Earth.

where delta v is the change of velocity during the time interval ¢t. Instantaneous acceleration is the average acceleration taken over an infinitesimally short time interval.

If an object has position x0 and velocity v0 at time t = 0 and moves in a straight line with constant acceleration, the velocity v and position x at a later time t are related to the acceleration a, the initial position x0 , and the initial velocity v0

老外在语言描述方面还是非常讲究的，举个🌰：

Falling from a tower和Thrown down from a tower

第一个是从塔上掉下去，是没有初速度的；第二个是刻意从塔上丢下去的，那么在这道题中的object就会有一个初速度

他们的书会把这道题涉及到的方方面面都讲到：

The tangent is a straight line that touches the curve only at the one chosen point, without passing across or through the curve at that point.

delta t = t 1- t2 时间差

average velocity=v1-v2/t1-t2

The slope of a curve at any point on a graph is the slope of the tangent to the curve at that point. On a graph of position vs. time, the slope is equal to the instantaneous velocity. On a graph of velocity vs. time, the slope is the acceleration.

那总结差不多就到这里了，希望能帮到大家