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21-30. Write True if the sentence is correct and False if it is not correct.
21. We can walk on the surface of the Earth and don't float off into space.
22. The moon revolves around the sun.
23. A force always causes things to move.
24. When an object is at rest, no gravitational force is acting on it.
25. Gravitational force pulls all things downward.
26. Mass and weight are the same quantities.
27. All objects on Earth have weight.
28. Some forces are useful to people.
29. Gravity makes it easy for a person to ride a bicycle uphill.
30. Weight is measured in grams (g) and kilograms (kg).​


Sagot :

Answer:

21. False

22. False

23. True

24. True

25. True

26. False

27. True

28. True

29. False

30. True