第４章
次元または 3 次元の動き
位置ベクトルと変位ベクトル
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 ...
平均速度ベクトルと瞬間速度ベクトル
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 ...
加速度ベクトル
In everyday conversation, accelerating means speeding up. Acceleration is a vector in the same direction as the change in velocity, Δv, therefore the ...
加速度ベクトルの方向
Acceleration occurs when velocity changes in magnitude (an increase or decrease in speed), direction, or both. Although acceleration is in the direction ...
発射体の動き
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 ...
発射体の動き:方程式
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 ...
発射体の動き: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 ...
均一な円運動
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 ...
不均一な円運動
In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all ...
1次元での相対速度
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 ...
2次元での相対速度
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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