1. Prep At School | 15 Copy: GN, CU 5 Cut: GN, CU 3 Load: video 2 Set-up: clay, wire, ribbon, spring scale 5 At Home | x xxx

2. Do Now 1. Explain which stone is most difficult to accelerate from rest. 2. Explain which stone requires the most force to stop it when rolling downhill at 30 m/s? 3. Identify which footwear has more area and explain how this affects pressure on the snow. 4. If the same person uses each type of footwear, explain why they still apply the same amount of force to the snow. 4 minutes ! boulder rock pebble San Jose, Costa Rica stilts snow shoes

8. Checking Up 3-1 1 2

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13. Agenda Do Now 5 Checking Up 5 Investigate 5 Physics Talk 25 Checking Up 5 Objectives 3-2 We are learning… Newton’s first law states that an object in motion will stay in motion unless acted upon by a force. If your vehicle stops suddenly, you continue to travel forward. Pressure is defined as the force per unit area. A seat belt made from wire could slice through your body, while a seat belt of wide cloth will stop you without much pressure. We will be successful when we can… Explain Newton’s first law of motion Describe the role of seat belts Identify the three collisions in every accident Compare the effectiveness of various wide and narrow seat belts Express the relationship between pressure, force, & area BIG Question 1.How do seat belts protect us during a car accident? 2.How does the thickness of the seatbelt affect its utility?

14. Investigate 4 minutes ! 4a – 4b

15. Newton’s 1 st Law Part 1: objects at rest stay at rest Part 2: objects in motion stay in motion in a straight line with constant speed Part 3: parts 1 & 2 are only true when net force is zero Quick Check

16. Why did the passenger keep moving when the vehicle suddenly stopped during Investigate Part A? What was the role of the seat belt in Investigate Part B?

17. 3 Collisions (page 269) Collision 1: ___________________________________ Collision 2: ___________________________________ Collision 3: ___________________________________

18. Quick Check If the force required to stop the vehicle was the same regardless of seat belt type during Investigate Part B, why did injury severity vary? What was the role of seat belt width in Investigate Part B?

19. Safer Seat Belts Pressure is force per area

20. Bed of Nails

21. Checking Up 6 minutes !

22. Homework :D 1. Physics to Go 3-1 & 2 Friday January 29th 2. Quiz 3-1 & 2 Tuesday February 2nd Due TODAY!