Το καλάθι σου είναι άδειο.
The small car accelerates until there is an unbalanced force acting on it
Polish astronomer who developed the heliocentric system
To maintain balance, the heavier child sits nearer to the rotation axis.
It is a type of lever that has the resistance (or output force) in the middle and the effort at one side and the fulcrum on the other side of the resistance
The alcohol burner heats the test tube, and then the test tube heats the cooler water
