Name: __________________________________________ Period: ___ Date: _________

1. Define free fall.
2. The free fall acceleration is directed toward the __________________________________.
3. Free fall acceleration results from ______________________.
4. Free fall acceleration is abbreviated as ______.
5. The value of ‘g’ is _______________.
6. 1.5 kg book and 15 Kg rock are dropped from same height. Which one will hit the ground first?
7. What is the value of free fall acceleration of all objects on earth?
8. Weight equals ___________.
9. Define weight.
10. Write down the equation for weight.
11. What is the SI unit for weight.
12. What will be the weight of 1 Kg book?
13. * Do astronauts experience gravity?
14. Why doesn’t floor of the shuttle push up against the astronauts?
15. What is "apparent weightlessness"?
16. Define mass.
17. What happens to an object’s weight with change in its location?
18. What is the value of ‘g’ on moon?
19. What happens to astronaut’s mass in space shuttle, earth or moon?
20. What influences the shapes of living things?
21. How is the force of gravity, on organisms living in water, balanced?
22. *Why is strong skeleton unnecessary for water creatures?
23. Define terminal velocity.
24. What are the action and reaction forces on a soccer player?
25. How do the action reaction forces differ from balanced forces?
26. Newton’s third law is also called as ________________________________________.
27. Write down the statement of Newton’s 3^rd law.
28. Newton’s third law is used in _______________________.
29. Why do rockets burn up most of their fuel during the early stage?
30. Why does rocket experience greater air resistance initially?