2021IGCSE物理怎么复习 TOPIC2运动学的概念你都理解了吗？

IGCSE物理是很多学员都会学习的一门课程，IGCSE物理有着广范围的考点，成绩在大学录取时也占据一定的比重。下面就给大家分享一些来自IGCSE物理Topic 2 Kinematics 运动学的一些基本概念。

IGCSE物理运动学的一些基本概念

state what is meant by speed and velocity

学员需要掌握 speed （没有方向）和 velocity （有方向）的区别。同时 距离distance 和位移 displacement 同样也是一个带方向一个不带方向。

calculate average speed using distance travelled / time taken

计算 v=d/t, 这里面的平均速率是没有方向的

state what is meant by uniform acceleration and calculate the value of an acceleration using change in velocity / time taken

学员需要理解匀加速运动 ， 并用 a=v/t 计算加速度。

interpret given examples of non-uniform acceleration  

举例解释非匀速加速运动

plot and interpret a displacement-time graph and a velocity-time graph  

绘制并解释距离时间图 斜率是速度 正负代表方向 ，速度时间图 速度时间图的斜率是加速度 斜率正负代表加速度方向

deduce from the shape of a displacement-time graph when a body is: 

(i) at rest 

(ii) moving with uniform velocity 

(iii) moving with non-uniform velocity

通过位移时间图 判断 物体在停止 匀速运动还是非匀速运动

deduce from the shape of a velocity-time graph when a body is: 

(i) at rest 

(ii) moving with uniform velocity 

(iii) moving with uniform acceleration 

(iv) moving with non-uniform acceleration

通过速度时间图判断物体的运动情况 停止 ，匀速运动 匀加速运动 非匀加速运动

calculate the area under a velocity-time graph to determine the displacement travelled for motion with uniform velocity or uniform acceleration

用速度时间图的面积 来求一个物体在匀速或匀加速情况下的位移

state that the acceleration of free fall for a body near to the Earth is constant and is approximately 10 m/s2

理解自由落体运动， 了解自由落体运动加速度不变 数值接近 10m/s2

describe the motion of bodies with constant weight falling with or without air resistance, including reference to terminal velocity

Effect of Air Resistance1. In real life, a falling object will encounter air resistance on Earth, unless it is moving in a vacuum.

Air resistance acts against the motion of the object increasingly to reduce its downward acceleration (NOT SPEED) to zero.

When the air resistance increases till it is equal to the weight of a falling object, the acceleration of the object is zero.

With zero acceleration, the object will continue falling downward at a constant velocity.

The constant velocity of the object is known as “terminal velocity”.

在学习这部分时，同学们不仅仅需要理解概念，对于一些真题和课后习题也要经常练习。同学们今天的分享就到这里了，同学们有需要真题的话，可以点击【预约试听】或者扫描下方二维码了解更多信息。

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