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II. Directions: Write TRUE if the statement is correct and FALSE if not.

16. Gravity is a contact force that acts between two separate objects.
17. Friction keeps objects from sliding off surfaces.
18. Gravity keeps anything from going down.
19. Sir Isaac Newton discovered the principle of gravity
20. Sound is produced through vibrations.​


Sagot :

Answer:

16. True

17. True

18. False

19. True

20. True

Answer:

16.False

17.False

18.True

19.False

20.False