物体转弯是速度为什么减小 最好用英文 1.A car of mass 750kg is being driven by Fred at a constant speed of 20m/s.In order to maintain this constant speed,it is exerting a thrust force of 15kN.Fred approaches a gentle bend in the road.F
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物体转弯是速度为什么减小 最好用英文 1.A car of mass 750kg is being driven by Fred at a constant speed of 20m/s.In order to maintain this constant speed,it is exerting a thrust force of 15kN.Fred approaches a gentle bend in the road.F
物体转弯是速度为什么减小 最好用英文
1.A car of mass 750kg is being driven by Fred at a constant speed of 20m/s.
In order to maintain this constant speed,it is exerting a thrust force of 15kN.
Fred approaches a gentle bend in the road.Fred is able to maintain a
constant speed as he rounds this bend,but his velocity changes.Explain how
this is possible.
物体转弯是速度为什么减小 最好用英文 1.A car of mass 750kg is being driven by Fred at a constant speed of 20m/s.In order to maintain this constant speed,it is exerting a thrust force of 15kN.Fred approaches a gentle bend in the road.F
The direction of the car's velocity changes when the car is driving at the gentle bend in the road. The car only has a normal acceleration , so the speed of the car won't change.
Hope my answer will be helpful.
当物体转弯时,物体做曲线运动
由题意,知在转弯前是直线运动,
当转弯时物体需要一个向心力,,
减小速度,以提供足够的向心力。
英文?为什么?
转弯之前直线运动,转弯的时候需要提供一个向心力,这个力可能是由速度转化的(动力能转化成力),所以总的能量没变,而速度降低了。