Tuesday (10/1) Turn in: Staple your lab group’s data sheets from height lab. Place in top tray. Pick-up: Vector & Angle review Ws (complete for Warm-up) Agenda: Review Warm-up exercise (pair share - if needed) Intro. to relative motion: Relative Motion Video – taking it old school 1960 and providing an example of a modern day student produced Mythbuster! Practice examples HW: Vector packet – due block day

This lesson we will: Combine component vectors to produce resultants. Use the head-to-tail method to do a vector analysis of a student route through school. Look at how frames of reference impact vectors. Treasure Hunt – block day

WARM –UP REVIEW

COMPONENTS: 2 or more vectors acting on the same point. Combine two components (x and y) to get a single vector called a RESULTANT: – One vector having the same effect as the combined components.

An airplane flies east at a velocity of 120 km/h. There is a 30 km/h tailwind. What is the resultant velocity of the plane? (Tail wind blows in the same direction as the plane.) 120 km/h + 30 km/h = 150 km/h East

What if the tailwind was instead a HEAD wind? An airplane flies east at a velocity of 120 km/h. There is a 30 km/h headwind. (This means the wind is blowing west.) What is the resultant velocity of the plane? When component vectors act in opposite directions we subtract the components to find the resultant. 120 km/h - 30 km/h = 90 km/h East Direction of the resultant is the direction of greater magnitude.

Summary: When components act in the same direction: add When components act in opposite directions: subtract WHAT DO YOU DO IF ONE VECTOR IS North and one East? We solved mathematically last week. However, you can also solve graphically.

Ex. A boy walks 9.0 km north and then 6.5 km east. What is the resultant displacement? Solve this using the graphing method.

Solve Graphically using method Start with BOLD DOT (resultant is drawn from this reference point.) Draw the LONGER vector first. Draw next vector HEAD TO TAIL. Draw resultant from the big DOT to the last ARROW HEAD. Measure the magnitude of the resultant with a ruler of the same scale. Finally measure the angle placing the baseline of the protractor on the longer component’s axis. State the answer in the complete form. 11 km, 36 degrees E of N

Your Turn: On your own or with a partner at your table.

Example a: Hint: long vector first

HOW DID YOU DO?

HW: complete Vector packet

What if your frame of reference changes? What is FRAME OF REFERENCE? Dr. Hume – guided notes clip (15 min.) Student produced mythbuster (4 min.) What improvements could you make to the mythbuster?