Chapter 4
Motion in Two or Three Dimensions
位置和位移矢量
To describe the motion of an object, one should first be able to describe its position (where it is at any particular time). More precisely, the position ...
平均和瞬时速度矢量
To calculate other physical quantities in kinematics, the time variable must be introduced. The time variable not only allows us to state where an object ...
加速度矢量
In everyday conversation, accelerating means speeding up. Acceleration is a vector in the same direction as the change in velocity, Δv, therefore the ...
加速度矢量的方向
Acceleration occurs when velocity changes in magnitude (an increase or decrease in speed), direction, or both. Although acceleration is in the direction ...
弹射物运动
An object thrown in the air follows a parabolic path under the influence of Earth's gravitational force. The motion of such an object is called ...
弹丸运动:方程
Projectile motion is commonly observed in our day-to-day life. For example, a basketball thrown by a player, an arrow shot from a bow, and kids jumping ...
弹丸运动:示例
The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw ...
匀速圆周运动
Uniform circular motion is a specific type of motion in which an object travels in a circle with a constant speed. For example, any point on a propeller ...
非匀速圆周运动
In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all ...
一维中的相对速度
The understanding of the concept of reference frames is essential to discuss relative motion in one or more dimensions. When we say that an object has a ...
二维相对速度
Relative velocity is the velocity of an object as observed from a particular reference frame, or the velocity of one reference frame with respect to ...
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