Core practical 1: Investigating force, mass and acceleration 力、质量、加速度的研究 Core practical 2: Investigating speed, frequency and wavelength of waves 波速、频率、波长的研究 Core practical 3: Investigating refraction in glass blocks 玻璃砖的折射 Core practical 4: Investigating thermal energy 热能 Core practical 5: Investigating electrical circuits 电路 Core practical 6: Investigating the density of solids and liquids 固体和液体的密度 Core practical 7: Investigating the properties of water 水的性质 Core practical 8: Investigating the extension of a spring 弹簧的伸长