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Frictional force
The force that resists motion when the surface of one object comes in contact with the surface of another
Frictional forces stop us from slipping when we walk and slow down a cyclist when they stop pedalling

Gadget
A small mechanical or electronic device with a special function and high mobility
The concern goes beyond one shady app or one off-brand gadget.
In our tests, this gadget received high marks across the board
Gizmo
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