Advantages: Rubber grip the pedal, lubricant can loose the rusty screw, Roller can help object to move easily, Disadvantages: Rough surface can wear out shoe sole, Amir injured after fall off the bike, Drill produce loud sound and cause sound pollution,

Effect of Frictional Force

Papan Peringkat

Gaya visual

Pilihan

Berganti templat

Pulihkan simpan otomatis: ?