1. To review for tomorrow’s quiz, play this review game. Use your checklist as you play! Ch.2-1 Gravity and Motion

2. Instructions To play: ◦Read the question slide. ◦Wait until everyone in your group has an answer written down. ◦Click the powerpoint to the next slide and reveal the answer. ◦If you got the answer correct, great going! Check that off of your list. ◦If you got the answer incorrect, be sure to write the correct answer on your worksheet quickly!

3. Question 1: Terminal Velocity Define terminal velocity

4. Answer 1: Terminal Velocity Terminal velocity is the constant velocity of an object when only the force of gravity is acting on the object.

5. Question 2: Gravity If you drop an apple and a feather off of a cliff, and there is no air resistance, which will hit the ground first?

6. Answer 2: Gravity They will both land at the same time.

7. Question 3: Free Fall Define Free Fall.

8. Answer 3: Free Fall The motion of an object when only the force of gravity is acting on it.

9. Question 4: Weightless Are monkey’s weightless in space?

10. Answer 4: Weightless No, nothing can be weightless. Anything that has mass has weight.

11. Question 5: Centripetal Force Define centripetal force.

12. Answer 5: Centripetal Force The unbalanced force that causes objects to move in a circular path.

13. Question 6: Acceleration What is the average acceleration of a falling object?

14. Answer 6: Acceleration 9.8 m/s/s

15. Question 7: Air Resistance What three characteristics affect the amount of air resistance acting on an object?

16. Answer 7: Air Resistance Size of the object Shape of the object Speed of the object

17. Question 8: Orbit Define orbit.

18. Answer 8: Orbit The path of one object around another in space.

19. Question 9: Change in Velocity A volleyball rolls off of a table and hits the ground after 3.5 seconds. What is the volleyball’s velocity when it hits the ground?

20. Answer 9: Change in Velocity Δv= g(t) Δv = x g = 9.8 m/s/s t= 3.5 s X= 9.8(3.5) X= 34.3 m/s Down

21. Question 10: Air Resistance Define air resistance.

22. Answer 10: Air Resistance The force that opposes the motion of objects through the air.

23. Question 11: Change in Velocity A bouncy ball falls out of a toy box and hits the floor after 0.75 seconds. What was the velocity of the ball as it hit the ground?

24. Answer 11: Change in Velocity Δv= g(t) Δv = x g = 9.8 m/s/s t= 0.75 s X= 9.8(0.75) X= 7.35 m/s Down

25. Question 12: Acceleration What does the “g” stand for in the formula Δv=g(t)?

26. Answer 12: Acceleration Acceleration Due to Gravity 9.8 m/s/s

27. Question 13: Falling Objects Which object accelerates more quickly when dropped? ◦Acorn ◦Marble ◦Laptop

28. Answer 13: Falling Objects They all accelerate at the same rate, 9.8m/s/s.

29. Question 14: Change in Velocity A leaf falls off of a tree. The leaf hits the ground at a velocity of 17.6 m/s. How long did it take the leaf to fall?

30. Answer 14: Change in Velocity T= Δv g Δv = 17.6 m/m g = 9.8 m/s/s t= x X= 17.6 9.8 X= 1.8 s

31. Question 15: Gravity and Motion What two forces act on all falling objects?

32. Answer 15: Gravity and Motion Air resistance Gravity

33. Question 16: Gravity and Motion What characteristics cause a parachute to fall slowly.

34. Answer 16: Gravity and Motion A uniform shape (all sides are equal) Even strings along all sides of the parachute Minimal holes on the sides A more rounded shape that catches the air inside it (not a completely flat parachute)