英语高手的哥哥姐姐们,要怎么回答,1 What's the SI unit for force?2 what's inertia?3 what's the value of the acceleration due to gravity?4 how are the net force acting on an object,mass of the object and acceleration of the object mathema

英语高手的哥哥姐姐们,要怎么回答,1 What's the SI unit for force?2 what's inertia?3 what's the value of the acceleration due to gravity?4 how are the net force acting on an object,mass of the object and acceleration of the object mathema
英语高手的哥哥姐姐们,要怎么回答,
1 What's the SI unit for force?
2 what's inertia?
3 what's the value of the acceleration due to gravity?
4 how are the net force acting on an object,mass of the object and acceleration of the object mathematically related to each other?
5 what's a vector?(Be brief)
6 Briefly describe what's velocity and acceleration?
7 what's the Newton's Third Law?
8 Name one difference between mass and weight?
要用英语的回答,

英语高手的哥哥姐姐们,要怎么回答,1 What's the SI unit for force?2 what's inertia?3 what's the value of the acceleration due to gravity?4 how are the net force acting on an object,mass of the object and acceleration of the object mathema
1.力单位是什么?----N(牛顿）
2.什么是惯性-----A particle will stay at rest or continue at a constant velocity unless acted upon by an external unbalanced force.
（惯性定律；即牛顿第一定律）
3.重力加速度是多少?9.8N/KG
4.重力,加速度力,在一个物体上的合力是什么样子的,之间有什么计算规律?----根据三角函数（你应该学过）
5.什么是矢量（向量）?——vector have direction and value(最广义指线性空间中的元素.它的名称起源于物理学既有大小又有方向的物理量)
6.描述一下速率和加速度的不同?---acceleration is a vector velocity is a scalar quantity.
7.牛顿第三定律是什么?---Whenever two bodies interaet they play forces of equal size but opposite direction on each other even action has an equal and opposite reaction.(牛顿第三定律的内容主要有：两个物体之间的作用力和反作用力,总是同时在同一条直线上,大小相等,方向相反.即 F1＝－F2（N=N‘） ①力的作用是相互的.同时出现,同时消失.②相互作用力一定是相同性质的力 ③作用力和反作用力作用在两个物体上,产生的作用不能相互抵消.④作用力也可以叫做反作用力,只是选择的参照物不同 ⑤作用力和反作用力因为作用点不在同一个物体上,所以不能求合力)
8.质量与重量的区别?---在日常生活中质量与重量意思是一样的,重量也是指质量,质量不随物体的状态、位置等任何因素而改变.单位：千克、吨等.但是在物理中,重量往往是指物体的重力,单位为牛.重力会随着星球的引力的不同而改变,比如说,地球两极的重力加速度比其他地方大,那么物体在两极重力也会比其他地方大；再如,月球引力比地球小,那么同一物体在地球上的重力要比在月球上的重力大.