Name:___________________________________________Date:_______________Period:_________
Gravity
1. A soda can takes 5 seconds to reach the ground after it is knocked from the top of a
baseball stadium bleacher.
A) How high was the bleacher? 122.6 m
B) What was its velocity when it strikes the ground? -49m/s
2. A volley ball is spiked downward at a velocity of 4 m/s from a height of 2.5 meters.
A) What was its final velocity before it hits the ground? -8.1m\s
B) How long was it in the air? 0.42 s
3. A potato was launched from a potato launcher straight up in the air at a velocity of 35 m/s.
A) What was the potato’s maximum height? 62.4 m
B) How long before it reached the ground? 7.1 s
C) What was its velocity when it strikes the ground? -35m\s
4.
A potato was launched from a potato launcher straight down from a 100 m cliff with a
velocity of 35 m/s.
A) How long before it reached the ground? 2.2 s
B) What was its velocity when it strikes the ground? -56.4m\s
5. A paintball player shoots her gun straight up in the air. The pellet leaves the muzzle of the
gun at a velocity of 50 m/s.
A) At what time(s) is the pellet 10 m off the ground? 0.2 s, 10 s
B) What is its final velocity before it hits the ground? -50 m\s
C) what is the maximum height of the pellet? 127.4 m
6. A golf ball is dropped from a classroom window in a physics lab and bounces. If the time
between the first two bounces is 4.6 s
A) To what maximum height does the ball bounce? 26 m
B) What is the ball’s upward velocity upon the first bounce? 22.5 m\s
C) What is the ball’s velocity just before it hits the second bounce? -22.5 m\s
7. A bullet is shot straight up in the air at a velocity of 322 m/s.
A) What is the maximum height that the bullet reaches? 5285 m
B) How long until the bullet reaches its maximum height? 33 s
C) How long until the bullet returns to its original position? 66 s
D) What is the velocity of the bullet just before it returns to the gun’s muzzle? -322 m/s
E) Create a velocity-time graph of the bullet’s motion, using the following time:
10s, 20s, 30s, 40s, 50s, 60s, 65s
Name:___________________________________________Date:_______________Period:_________
velocity final
Your graph should have
this general shape
400
velocity (m/s)
300
200
100
0
-100
velocity final
0
-200
-300
-400
time (seconds)
Name:___________________________________________Date:_______________Period:_________
More Gravity Practice
1.
The John Hancock Center in Chicago is the tallest building in the United States in which there
are residential apartments. The Hancock Center is 343 m tall. Suppose a resident accidentally
causes a chunk of ice to fall from the roof.
a. With what velocity would the ice hit the ground?- 82 m/s
b. How long will it take for the ice to hit the ground? 8.4 s
c. What is the chunk of ice’s velocity 1.7 seconds after it drops? -16.7 m/s
2. The Sears Tower in Chicago is 443 meters tall. Suppose a book is dropped from the top of the
building.
a. What would be the book’s velocity at 221 meters above the ground? -66 m/s
b. What is the book’s velocity just as it reaches the ground? -93 m/s
c. How long did it take the book to fall 222 meters? 6.7 s
d. How long did it take the book to reach the ground? 9.5 s
3. A paintball player shoots a paint pellet straight down from the top of a 35 meter tower. The
paintball misses its target and strikes the ground below the tower exactly 1 second after the shot
was fired.
a. What was the initial speed of the paintball? -39.9 m/s
b. What is the paintball’s velocity just before it hits the ground? -47.7 m/s
c. What is the paintball’s velocity 10 meters above the ground? -37.4 m/s
4. A clown is shot straight up from a circus cannon at a velocity of 18 m/s to attempt to catch the
trampoline artist’s hand exactly 18 meters from the base of the cannon
a. Does the clown reach the trampoline artist’s hand? No, he misses by 1.5 m
b. How long does the clown remain in the air? 3.7 s
c. At what two times is the clown exactly 10 meters from the base of the cannon? 0.7 s, 3.0
s
5. A juggler on the top of a 14 m platform tosses a ball straight up in the air at a velocity of 8 m/s.
The juggler misses the catch, and the ball falls to the ground below the platform.
a. What is the maximum height the ball reached? 17.3 m
b. How long was the ball in the air? 2.7 s
c. With what speed did the ball hit the ground? -18.4 m/s
6. A paintball player shoots a victory round straight up in the air from the edge of a 35 meter
platform 39.9 m/s, eventually hitting the ground below the platform.
a. What is the maximum height relative to the ground that the paintball reached? 116 m
b. How long did it take to reach this maximum height? 4.1 s
c. How long, total, was the paintball in the air? 8.9 s
d. What was the paintball’s velocity just before it hit the ground?-47.7 m/s
e. At what two times was the paintball 50 meters above the ground? 0.4 s, 7.7 s
f. What are the velocities’ of the paintball at exactly 50 feet above the ground? +36m/s,-36
m/s
7.
The gravity of the moon is 1/6 that of Earth’s gravity. If a penny is dropped from the top of a 25
meter tower set on the moon,
a. How long would it take the penny to reach the moon’s surface? 5.5 s
Name:___________________________________________Date:_______________Period:_________
b. With what velocity would it reach the moon’s surface? -9.0 m/s
c. If the penny was tossed up from the surface of the moon at a speed of 8m/s, how long
would it in flight before landing back in the astronaut’s hand? 9.8 s
d. How much longer would the penny be in flight on the moon compared to how long would
it be in flight on the Earth? 9.8 s – 1.6 s = 8.2 s