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- 1. Multiple ChoiceIf a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second byabout 5 m/s.
about 9.8 m/s^2
about 15 m/s.a rate that depends on its initial speed. - 2. Multiple Choice
Free fall is any motion of a body where ____ is the only force acting upon it.
body attraction
tension
gravity
velocity
- 3. Multiple Choice
If an object is in free fall for three seconds, how fast will it be falling at the end of its motion?
vf= gt
9.8 m/s
19.6 m/s
29.4 m/s
39.2 m/s
- 4. Multiple ChoiceA pumpkin is dropped from a 35 m building. What is its initial velocity (vi)?9.8 m/s235 m0 m/s9.8 m/s
- 5. Multiple ChoiceDave runs a 400 m race with a speed of 4 m/s. What time will it take him to finish the race?400 minutes100 minutes100 seconds.25 seconds
- 6. Multiple Choice
0.09 s
0.03 s
0.3 s
0.9 s
- 7. Multiple Choice
A vector quantity has ______________.
Magnitude only
Magnitude and Direction
Direction only
Direction and angles
- 8. Multiple Choice
A boat is traveling at 50 m/s in a river flowing at 15 m/s in the exact same direction. What is the resultant velocity of the boat?
65 m/s
35 m/s
52 m/s
It cannot be determined
- 9. Multiple Choice
A hiker walks 40 m due North then turns due South and walks 60 m. What is the resultant displacement?
100 m North
100 m South
20 m North
20 m South
- 10. Multiple Choice
Click all the measurements needed to determine the range of a horizontal projectile.
height
horizontal velocity
mass of the projectile
- 11. Multiple ChoiceWhat is the initial vertical velocity of a projectile at the apex of the trajectory?0 m/s9.8 m/s9.8 m/s2-9.8 m/s2
- 12. Multiple ChoiceIf you throw a baseball straight up, what is its velocity at the highest point?9.8 m/s29.8 m/s0 m/s20 m/s
- 13. Multiple ChoiceIf you throw a baseball straight up, what is its acceleration at the highest point?9.8 m/s29.8 m/s0 m/s20 m/s
- 14. Multiple Choice
A player kicks a ball across the field. At the very top, what is the acceleration of the ball?
It is accelerating to the right
There is no acceleration at the top
9.8 m/s2 up
9.8 m/s2 down
- 15. Multiple Choice
A soccer ball is kicked horizontally off a cliff. What information is needed to find the time to fall?
The height of the cliff
The initial speed of the ball
The mass of the ball
All of these
- 16. Poll
How comfortable are you solving horizontal projectile problems?
Very comfortable
I'm pretty sure I've got it
I feel okay but not great
I'm so confused please help (ask for help if this is you!)
- 17. Multiple Choice
Which best describes the horizontal motion of a projectile, assuming no air resistance?
Acceleration of -9.8 m/s2
Acceleration of -5 m/s2
An increasing acceleration every second
Constant velocity
- 18. Multiple Choice
What is the first step in solving a projectile problem?
Two columns - x and y
sketch it
variable lists
calculate time
- 19. Multiple Choice
A cannon is fired horizontally from a 5.0 m tall tower. How much time will it take until the projectile hits the ground?
0.5 s
1.0 s
2.0 s
5.0 s
- 20. Multiple Choice
If the cannonball from the previous question is fired with a horizontal velocity of 140 m/s, how far will it travel horizontally?
141.4 m
282.8 m
176.3 m
83.8 m
- 21. Multiple Choice
The final requirement for a degree in geology is Field Camp, an 8 week field experience in which budding geologists must complete rigorous real-world mapping projects. To celebrate the end of field camp, one student threw his rock hammer off of a 78 m cliff with a horizontal velocity of 34 m/s. He was then reminded that he had one more day of field work, so he needed to go get his hammer. How far away from the cliff did he have to walk in order to find his hammer?
Solve for time first t= sqrt(2d/g)
then Horizontal Distance d=vt
221.78 m
153.23 m
135.65 m
78.98 m
- Answer choicesTagsAnswer choicesTags