Day 1 Motion vocabulary SCI 10 Physics Physics

Day 1 Motion vocabulary SCI 10 Physics

Physics ►The science that deals with matter and energy and their interactions. ►Examples: § motion, light, electricity, gravity, radiation, etc. § from atomic particles to the universe. . .

Kinematics The study of motion in a straight line. ►Motion: the process of changing position.

Reference point ►a starting point used to describe the location or position of an object ► How would you describe: § Your location right now? § The location of the school?

Scalar vs. Vector Quantities ► Scalar measure: A quantity that has magnitude (size), but no direction. § Ex: ► Vector measure: has a magnitude AND a direction § Ex:

Position ► Position ( ►Includes point ): an object’s location distance and direction from a reference ► Units= meters (m) ► Vector measure ► Ex: The crash was 24. 5 km south of Exit 3 distance § Initial position § Final position direction reference point

Distance (d ): ► total length travelled § Units: meters (m) § Scalar quantity ► di initial distance df final distance ► ∆d distance travelled ► Formula: ∆d = df – di or ∆d = d 1 + d 2 § Ex: From my house, I walked 2 km to the store then returned home. The distance travelled is 2 km + 2 km = 4 km

Displacement ( ) ► Displacement ( ): straight line distance from one point to another § The difference between the final position ( initial position ( ) § Unit: meters (m) § Vector quantity Δ = change ► Displacement is the change in position ) and the

Time Interval ► Time (t): units = seconds (s) § Scalar quantity § Time interval (Δt ): The difference between the final t t time (end time) f and the initial (start) time i. Δt = t f - t i § Change in time = final time minus initial time

Practice Determine the following time intervals. 1. From 8: 15 am to 8: 45 am ∆t = 30 min 2. From 10 s to 55 s ∆t = 45 s 3. From 1: 30 pm to 4: 00 pm ∆t = 2. 5 hours or ∆t = 150 min 4. ti = 6. 3 s and tf = 13. 8 s ∆t = 7. 5 s

Think About It: ►What ►What is the reference point? is the person’s initial position? is the person’s final position? distance did the person travel? was the time interval?

Practice What is the total distance covered by race car drivers at the Indianapolis 500 (cars do 200 l aps of a 2. 5 mile track)? 2. What is the displacement of a race car driver at the Indy 500? 3. Mrs Purcell is walking in the forest. She doesn’t know it but she is 5 m north of a rattlesnake. She walks 4 m east, 3 m south, 4 m west and finally 2 m north. Will she walk on the snake? 1.

Practice 4. A skier moves from A to B to C to D. A C D B 0 min 2 min 3 min 1 min 40 m 100 m 40 m ► What is the total distance travelled by the skier? ► What is the skier’s total displacement?