physics
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Physics
Whiteboard Results (lab groups)
t
X
0 t
X velocity
0
t
Y velocity
0t
Y
0
Include Accelerations for each section of
the velocity graphs.
Video Analysis Results
t
X
0 t
X velocity
0
t
Y velocity
0t
Y
0
Horizontal Motion>constant velocity> ax = 0m/s/s
Vertical Motion>constant acceleration> ay = -10m/s/s
After Leaving theTable:
http://www.youtube.com/watch?v=D9wQVIEdKh8&feature=related&safety_mode=true&persist_safety_mode=1&safe=active
http://www.youtube.com/watch?v=zMF4CD7i3hg&safety_mode=true&safe=active&persist_safety_mode=1
Homework (Unit 6 Worksheet 1)
t
VV
t
Va f
0
0VtaV f
tVtay 02
2
1
20
2 2 VyaV f t
xV
Constant Velocity:
Constant Acceleration:
Unit 6 Worksheet 1 Answers1. a. Δy = -45m
b. t = 2.5s
c. t = 7.7s
d. Vfy = -37.4m/s
2. a. Vfy = -40m/s
b. t = 4s
3. a. Vfy = -60m/s
b. Δy = -180m
4. a. a = -10m/s/s
b. Δy = -160m
c. t = 3s
d. Vfy = -49m/s
Projectile Motion
• Projectile – objects that are thrown or launched into the air ( have an initial velocity) and are subject to gravity.
• Examples: bullet, missile, basketball shot, a long jumper, car, etc…
• Treat 2-D motion problems as two separate 1-D motion problems.
http://www.physicsclassroom.com/mmedia/vectors/hlp.html
Horizontally Launched Projectile
Horizontally Launched Projectiles1. Find Vx and Vy for each second…
Vx = 10m/s
1s2s
3s
4s
5s
6s
3. Find Δx and Δy for each second…
2. Find the resultant velocities
The Plane and the Package
Example Problem #1
6m
A snowboarder is launched horizontally with an initial velocity of 14m/s. The snowboarder is 6m off of the ground…
A. What time does it take for the snowboarder to hit the ground?
B. How far does he go
horizontally before
hitting the ground. Δx = ?
V = 30mi/hr14m/s
Example Problem #2How fast must a motorcycle be moving to clear a 7m horizontal gap if the landing surface is 3m lower than the launch surface. Hint: 1st find the time the motorcycle is in the air.
3m
7m
Vx = ?
Monday, January 28thPut your homework (U6 Worksheet 2) on your desk to be checked for completion.
3m
Δx = ?
Vx= 10m/s
Worksheet 2 Answers1a.
3m
Vx= 10m/s
Δx = ?
c. tfall = 0.77s and Δx = 7.7m
b.Fg
FN
Fg
Worksheet 2 Answers
2a. tfall = 1.09s, Vx = 4.59m/s
b. Vfx = 4.59m/s and Vfy= -10.9m/s
c. Vfy = 11.8m/s
6m
Vx= ?
5m
Vx=4.59m/s
Vy=-10.9m/s V=11.8m/s
• If the mountain biker, initially traveling at 9m/s, lands 7m horizontally away from the edge of the cliff, how high is the cliff?
h = ?
Vx=9m/s
7m
Whiteboard Problem
“Stunt Double “|Design Challenges|
Challenge #1 (Pad Location)
A
B
Δx = ?
Vx
H1
“Stunt Double “|Design Challenges|
http://www.youtube.com/watch?v=x8BuumWnJhU
Challenge #2 (Need for Speed)
A
B
Δx
V = ?
H1 H2
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