Do Now (11/15):

1.Make a list of concepts you will need to know for tomorrow.

Ms. Timson’s

Physics Review to Conquer Kinematics

Rules of the Game• There will be tribes, as divided by the teacher• For each problem which appears on the slide, the tribe will be able to work

together to vote on one answer given only the time which will be written on the slide.

• Tribes cast their answer using their voting cards only in the time allowed.• Each team with a correct answer is allowed to cast one vote to remove

another tribe from the island. The teacher will have each tribe cast their vote simultaneously by writing the color of the tribe they are voting for on their white board. The teacher will then remove tribes from the island.

• The teacher will track which tribes are in and which tribes are out of the game with signs on the board.

• If a tribe is voted out, they can reenter the game by answering the next question correctly to reenter. They will NOT receive a vote for that question but must wait until the next question.

• Winning tribes will be those still on the island at the end of the game.• ***The teacher will be the final judge of any conflicts or confusions – and

remember, be respectful and be honest!

1. A stone thrown horizontally from the top of a tall building follows a path that isA. parabolic B. a straight line C. circular D. made of two straight line segments E. hyperbolic

30 seconds

2. The acceleration in the y direction is approximately:

A. 9.8B. 9.8 m/s2

C. -9.8 m/s2

D. -9.8 m/s2 if up is positive 20 seconds

3. A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its velocity is _______.

a. entirely verticalb. entirely horizontalc. both vertical and horizontald. not enough information given to know.

45 seconds

4. A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its acceleration is _______. (Neglect the effects of air resistance.)

a. entirely verticalb. entirely horizontalc. both vertical and horizontald. not enough information given to know.

30 seconds

5. At what point in its path is the horizontal component of the velocity (vx) of a projectile the smallest?

a. The instant it is thrown.b. Halfway to the top.c. At the top.d. As it nears the top.e. It is the same throughout the path.

45 seconds

6. At what point in its path is the vertical component of the velocity (vy) of a projectile the smallest?

a. The instant it is thrown.b. Halfway to the top.c. At the top.d. As it nears the top.e. It is the same throughout the path.

45 seconds

8. Three balls (1 kg, 5 kg, & 10 kg) are dropped from a cliff. Which one lands first?

a)1 kgb)5 kgc) 10 kgd)all 3 land at once

30 seconds

10. In projectile motion:a) both horizontal & vertical velocities varyb)both horizontal & vertical velocities are

constantc) the horizontal velocity varies while the vertical

remains constantd)the vertical velocity varies while the horizontal

remains constant45 seconds

12. An acceleration directed towards the center of a circular path of motion is the _____ acceleration.

a)centrifugalb)centripetalc) curvilineard)inertial

20 seconds

13. If centripetal acceleration STOPS acting on a body in uniform circular motion, the body will move at _____ speed along a _____ path.

a)constant … straight lineb)varying … circularc) accelerated … straight lined)constant … circular

45 seconds

15. A merry-go-round with radius 5 m turns once every 10 seconds. If a boy sits on the edge of the merry-go-round, what it his centripetal acceleration?

(a)2 m/s2

(b)3 m/s2

(c)3 m/s(d) 0.5 m/ss

2 minutes

Congratulations!Good luck tomorrow!

I know you can conquer your test

16-20. A golf ball is struck giving it an initial velocity of 50 m/s at 40o from the horizontal. Calculate:

16. initial vertical velocity. 40 seconds

16-20. A golf ball is struck giving it an initial velocity of 50 m/s at 40o from the horizontal. Calculate:

17. The initial horizontal velocity. (3 pts)

40 seconds

16-20. A golf ball is struck giving it an initial velocity of 50 m/s at 40o from the horizontal. Calculate:

18. The maximum height of the ball in its flight. (4 pts)

1 minute 20 seconds

16-20. A golf ball is struck giving it an initial velocity of 50 m/s at 40o from the horizontal. Calculate:

19. The time the ball remains in the air. (3 pts)

1 minute 20 seconds

16-20. A golf ball is struck giving it an initial velocity of 50 m/s at 40o from the horizontal. Calculate:

20. The horizontal displacement of the ball in its flight. (3 pts)

1 minute

20. The _____ is a measure of change in position (only) in a particular direction.

a)accelerationb)Displacementc) distanced)speed

20 seconds

21. A student walks to school 3 blocks away and then returns home for lunch. After lunch he returns to school. His displacement as described here is ____

A)0 blocks B) 3 blocks C) 6 blocks D) 9 blocks

30 seconds

22. A feather is dropped on the moon from a height of 1.4 meters. The acceleration of gravity on the moon is 1.67 m/s2. Determine the time for the feather to fall to the surface of the moon.

A. .915 sB. 1.67 sC. 1.29 sD. 1.09 s

1.5 minutes

23. A projectile is fired vertically with an initial velocity of 98.0 m/s.

How many seconds after firing does the projectile return to the ground?

A)5 s B) 9.8 s C) 10.0 s D) 20 s E) 40 s

1.5 minutes

24. A projectile is fired vertically with an initial velocity of 98.0 m/s. How high does the projectile rise?

A)122.5 m B) 490 m C) 980 m D) 1960 m E) 3920 m

1.5 minutes