DAY 21
The goal today is for you to better understand how to break a vector into x and y components, and for you to be able to solve projectile motion problems where the projectile is moving with an initial horizontal velocity (no vertical component)
WARM-UP
Watch a video on how to solve these Horizontal Projects problems.
Title your notes: Day 21, Horizontal Projectile Motion
Copy the problem, and look at the notes here: LINK
Video is here. Answer the questions in your warm-up ---> LINK
CLASSWORK
1. (5min) HW Review: LINK
2. (10 min) Vector Practice Conceptual Questions
TB CH 5, pg 140, solve #49, 50, 51 (these are each 60 second problems)
TB CH 5 pg 141, solve #69, 72, 74 (these are 1-2 minute problems)
Check your results here: LINK
3. (15 min) Vector Practice Problems
TB CH 5, pg 141 #79, 80, 87 (these are 3-5 minute problems)
Check your results here: LINK
4. (25 min) Horizontal Projectile Motion Concepts & Problem Solving
Watch my video here first for an introduction to what you'll be doing: LINK
Read the following (you should skip Problem Type 2 and Equations for Vertical Motion of a Projectile - we aren't ready yet)
Copy the steps for the Solving Projectile Problems example (this one: "A pool ball leaves a 0.60-meter high table with an initial horizontal velocity of 2.4 m/s. Predict the time required for the pool ball to fall to the ground and the horizontal distance between the table's edge and the ball's landing location")
Now read the problem solving procedure, paying close attention to the "ONE CAUTION" section.
Check your Understanding by trying the soccer ball problem. Check your answer if you get stuck, or when you're done.
5. Projectile Simulator:
Assignment #021A: Complete activity #1. Since the worksheet is online, you can write your answers in your notes. Upload a photo to GC when you're done. If you need to finish this CW at home, please do so. Finish before submitting.
HOMEWORK
Assignment #021B: Complete activity #2.
10/06/16
#GOALS: SWBAT...
1. Translate p-t and v-t graphs into actual motion
2. Determine mathematical relationships among position, velocity, acceleration, and time.
3. Apply graphical and mathematical relationships to solve problems related to constant acceleration.
WARM-UP
0. Need help with the HW? Put the HW problem # in the Struggle Zone -->
1. A car stops at an intersection, then accelerates at a constant 5m/s2.
a. What is the car's initial velocity?
b. How fast will the car be going after one second? (Don't forget to include the correct units for speed).
c. How fast at two seconds?
d. How fast at three seconds?
2. If a fire truck rolls through an intersection at 7m/s, then accelerates at a constant 5m/s2,
a. What is the truck's initial velocity?
b. How fast will the fire truck be going after one second? (Don't forget to include the correct units for speed).
c. How fast at two seconds?
d. How fast at three seconds?
3. If acceleration is given as 10m/s2, what is the change in velocity per second?
4. Use G.U.E.S.S.: A car is coasting backwards downhill at a speed of 3.0 m/s when the driver gets the engine started. After 2.5 s, the car is moving uphill at 4.5 m/s. If uphill is chosen as the positive direction, what is the car’s average acceleration?
CLASSWORK
1. Walking Through Graphs
2. Reading Quiz
3. Equations of Position and Velocity with Average Acceleration
4. Practice Problems
- Complete individually. You may consult with groupmates/Mr. A if you need help
- On page 67, complete problem 25. On pg 69, solve 27 & 28
- Practice using the GUESS method, by neatly writing each set of info.
- Don't forget to use..... UNITS! :-)
- Once you finish solving, ask yourself, "Is this answer realistic?" "Does it make sense given the parameters of the problem?"
HOMEWORK
pg 69 #27, 28, & 29
pg 71 # 30, 34, 35
Need extra credit? Copy the notes and answer the questions for this one:
https://edpuzzle.com/media/5782c19c27ed9aaf13386853
Copy the notes and answer the questions:
https://edpuzzle.com/media/5782c19c27ed9aaf13386853
WARM-UP: Two-Part Motion (10 min - until 12:31)
1. A woman runs at a velocity of 4.5m/s for 15.0 minutes. How far does she run?
(Use G.U.E.S.S. -it'll make your life easier :-)
A. Given:
B. Unknown:
C. Equation:
D. Substitute helpful Givens into Equation
E. Solve
2. Lets complicate the above problem a little bit, and modify it.
A woman runs at a velocity of 4.5m/s for 15.0 minutes. She comes to a steep hill, and while running up the hill, she slows down at a constant rate of 0.05m/s2 for 90.0s and comes to a stop. In total, how far did she run?
A. How many parts are there to this motion?
B. You're already part of the way done - solve the rest of the problem.
3. Homework Check
Answers:
24: drawing
25: d=1.8km ; t=25min
27: 120m
28: 25s
29: 0.94m/s
CLASSWORK:
1. Two-part motion practice.
Individually, complete problems 31-33 on pg 71
2. Quiz return & review
3. FREE-FALL!
Free fall is a special type of acceleration that only occurs when an object falls through the air in Earth's gravitational field. When solving free fall problems, we make the following assumptions.
Air resistance is negligible.
Objects behave as point particles.
The acceleration of gravity is constant (9.8m/s2)
Demo
Free Fall Videos
- https://www.youtube.com/watch?v=xQ4znShlK5A
Is this ball accelerating? How can you tell?
Want more? https://www.youtube.com/watch?v=JG0Fie-yZzc
Want to see what this will look like in college?
https://www.youtube.com/watch?v=47rLgSD8Qs0
Quiz Tuesday on Reading (pg 72-75).
Pay attention