1. Welcome to Physics
Forces

2. Warm Up Look at your reading on Forces Turn to Page 44
Answer these statements
Give an example of a contact force.
Give an example of an action-at-a-distance force.
7 minutes
WHEN DONE:
Record scores and Get out planner

3. Agenda: summarize in planner
Newton’s Second Law Introduction to Egg Drop Project

4. Learning Targets
I can design, build and evaluate a device that will protect a dropped egg

5. Writing and Reading Discussion Group Work Instruction Quiet Focused
Active listening
On Topic
Ask Questions
Group Work
Focus on topic
Fulfill Roles
Lean in
Instruction
Listen
Take notes
Raise hands

6. Cornell Notes: The 2nd Law
Turn to page 47
Topic:
Newton’s Second Law
Essential Question:
What does Newton’s Second Law say about the relationship between force, mass and acceleration?

7. The Second Law
The acceleration of an object is directly proportional to the force on the object, and inversely proportional to its mass
In short:
Force goes up, acceleration goes up
Mass goes up, acceleration goes down
We need a model we can use that will help us think about how we can do something about the force experience by an egg as it hit the ground.

8. F m a F m a — = = The Second Law: Equation Form
Directly proportional inversely proportional

9. “Its not the fall that kills you. It’s the sudden stop at the end.”
-Douglas Adams

10. F m a — Δv Δt a = = SCENARIO 1: Mass= 1 kg Δv= 4 m/s Δt= 2 s
Make the change in velocity smaller: acceleration experience by the object goes down, and the force experienced by the egg goes down
Make the change in time larger: acceleration experienced by the object goes down, and the force experience by the egg goes down.
SCENARIO 4:
Mass= 1 kg
Δv= 10 m/s
Δt= 2 s
SCENARIO 2:
Mass= 1 kg
Δv= 8 m/s
Δt= 2 s

11. How to protect your egg
Increase the time it take for the velocity to change to zero
Decrease the pre-impact velocity
Create a force that accelerates your egg in the opposite direction
#1: This will reduce the acceleration, and thus the force
#2: This will also reduce the acceleration, and thus the force
#3: This will lower the overall, or net, force experience by the egg. It will accelerate the egg in the OPPOSITE direction.

12. Group Preference
Please quietly fill out the sheet to let me know who you think you can work best with
this might not be your bestie
you want to be successful, who will help you stay on task and do that?

13. Egg Drop Challenge

14. Egg Drop Challenge Introduction
Read
The Situation
Your Mission
Introduction: The Engineering Design Cycle
Answer the questions on Page 3
15 Minutes
If you finish early: read next section of packet (“Checkpoint 1”)

15. Checkpoint 1
Checkpoint 5
Checkpoint 2
Checkpoint 4
Checkpoint 3

16. Define and Research the Problem
Car Safety Features
Define and Research the Problem
DO:
READ questions on Pages 5, 6 and 7
Go to crockphysics.weebly.com
Navigate to “Forces” page Day 4
Watch Videos. Pause, rewind and repeat if necessary.
ANSWER Questions on Pages 5, 6 and 7
30 minutes
Checkpoint 1

17. Clean Up
Lab supplies put away Table supplies returned to box Name tags turned in Work turned in Notebooks in backpack Scrapes recycled Stay in your seat until the bell rings