full transcript

## Unscramble the Blue Letters

The original euitoaqn describing the gravitational force between two objects was written by iaasc Newton in 1687. Scientists’ understanding of gvitray has evolved since then, but Newton’s Law of Universal Gravitation is still a good approximation in most situations. It goes like this: the gravitational force between two objects is equal to the mass of one times the mass of the other, mleuipiltd by a very small number called the gravitational cnsantot, and divided by the distance between them, squared. If you doubled the mass of one of the ojecbts, the force between them would double, too. If the distance between them doubled, the force would be one-fourth as strong.

## Open Cloze

The original ________ describing the gravitational force between two objects was written by _____ Newton in 1687. Scientists’ understanding of _______ has evolved since then, but Newton’s Law of Universal Gravitation is still a good approximation in most situations. It goes like this: the gravitational force between two objects is equal to the mass of one times the mass of the other, __________ by a very small number called the gravitational ________, and divided by the distance between them, squared. If you doubled the mass of one of the _______, the force between them would double, too. If the distance between them doubled, the force would be one-fourth as strong.

1. multiplied
2. isaac
3. equation
4. objects
5. constant
6. gravity

## Original Text

The original equation describing the gravitational force between two objects was written by Isaac Newton in 1687. Scientists’ understanding of gravity has evolved since then, but Newton’s Law of Universal Gravitation is still a good approximation in most situations. It goes like this: the gravitational force between two objects is equal to the mass of one times the mass of the other, multiplied by a very small number called the gravitational constant, and divided by the distance between them, squared. If you doubled the mass of one of the objects, the force between them would double, too. If the distance between them doubled, the force would be one-fourth as strong.

## Frequently Occurring Word Combinations

### ngrams of length 2

collocation frequency
gravitational force 4
gravitational pull 3
light years 2
space station 2
celestial bodies 2

## Important Words

1. approximation
2. called
3. constant
4. describing
5. distance
6. divided
7. double
8. doubled
9. equal
10. equation
11. evolved
12. force
13. good
14. gravitation
15. gravitational
16. gravity
17. isaac
18. law
19. mass
20. multiplied
21. newton
22. number
23. objects
24. original
25. situations
26. small
27. squared
28. strong
29. times
30. understanding
31. universal
32. written