Why Does A Iron Nail Need To Be Clean Of Rust And Grease When Being Being Added To Copper Sulphate Solution?

Answer

When a pendulum is displaced from its resting equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force combined with the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth.
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