GCSE WJEC Physics: Calculation Practice Drills | GCSE WJEC 物理：计算题专项训练

📚 GCSE WJEC Physics: Calculation Practice Drills | GCSE WJEC 物理：计算题专项训练

Strong calculation skills are essential for GCSE WJEC Physics. This workbook-style guide targets the most common numeric topics: motion, forces, energy, electricity, waves and matter. Each section breaks down a key formula, provides a worked example and sets a practice problem. Work through all 12 drills to master the maths behind the physics.

扎实的计算能力是GCSE WJEC物理成功的关键。这本练习指南针对最常见的数值题型：运动、力、能量、电学、波和物质。每个小节解析一个核心公式，给出例题并设置练习题。完成全部12个训练，掌握物理背后的数学。

1. Speed, Distance and Time | 速度、距离和时间

The average speed of an object is the distance travelled divided by the time taken. The formula is:

物体的平均速率等于它移动的距离除以所用的时间。公式为：

v = s / t

where v is speed (m/s), s is distance (m), t is time (s). Always convert units to match.

其中v为速率(米/秒)，s为距离(米)，t为时间(秒)。请务必统一单位。

Example: A runner completes 400 m in 50 s. Calculate the average speed.

例题：一名跑步者用50秒跑完400米，求平均速率。

Answer: v = s / t = 400 / 50 = 8 m/s.

解答：v = s / t = 400 / 50 = 8 m/s。

Practice: A cyclist travels 9 km in 30 minutes. Find the speed in m/s. (Convert first!)

练习：一骑自行车者30分钟骑行9公里，求速率（单位：m/s）。（先转换单位！）

2. Acceleration | 加速度

Acceleration is the rate of change of velocity. The equation linking initial velocity (u), final velocity (v), time (t) and acceleration (a) is:

加速度是速度的变化率。联系初速度(u)、末速度(v)、时间(t)和加速度(a)的公式为：

a = (v – u) / t

where a is in m/s² (metres per second squared).

其中a的单位为m/s²（米每二次方秒）。

Example: A car accelerates from 5 m/s to 25 m/s in 4 s. Find the acceleration.

例题：一辆汽车在4秒内从5 m/s加速到25 m/s，求加速度。

Answer: a = (25 – 5) / 4 = 20 / 4 = 5 m

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