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