Tuesday 101 Turn in Staple your lab groups

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?