5 Distance 1 Reference Point 6 Displacement 2

5. Distance 1. Reference Point 6. Displacement 2. Scalar 7. Speed 3. Vector 8. Average Speed 4. Position

Reference Point • Def: a point that all motion will be measured relative to the Starting Point • This is the starting point.

Two Types of Units • ______: –Unit includes only objects magnitude (numerical value) Examples: __________ • ______: –Unit includes magnitude and direction Example: going 100 mph to the East Example: ___________

Two Types of Units • Scalar: –Unit includes only objects magnitude (numerical value) Example: speed, distance • Vector: –Unit includes magnitude and direction Example: going 100 mph to the East Example: Velocity, acceleration,

Position • Def: ____________________________ –Symbol =_____ –Unit = _______ –Scalar or Vector? • Use the position vs time graph to

Position • Def: a point some distance and direction from my reference point –Symbol = x –Unit = meters (m) –Scalar • Use the position vs time graph to calculate the speed of the bug using

Distance • Def: ______________________________ • Example: If Dallas was 100 miles away and I drove to and from Dallas, what would be my distance? ? _______ miles to Dallas ? _______miles from Dallas

Distance • Def: refers to the total distance traveled • Example: If Dallas was 100 miles away and I drove to and from Dallas, what would be my distance? ? _______ miles to Dallas ? _______miles from Dallas

Displacement • Def: ______________ __ (Δx = xfinal – xinitial) =______ – _____ Example: If Dallas was 100 miles away and I drove to and from Dallas, what would be my displacement? –Start point = ____

Displacement • Def: Refers to the change in position (Δx = xfinal – xinitial) Finish pt – start pt Example: If Dallas was 100 miles away and I drove to and from Dallas, what would be my displacement? –Displacement would be zero

Distance vs. Displacement Distance Scalar or Vector Unit: ____ Formula: ______ _Used to find: Displacement Scalar or Vector Unit: _____ Formula: ______ _ Used to find:

Distance vs. Displacement Distance Displacement Scalar quantity Vector quantity Unit: m, km Δx = xfinal – Total distance x initial traveled Used to find Speed Velocity Symbol: d

Distance vs. Time Graphs

Speed • Def: ______________________________ –Scalar or Vector Quantity? –Unit: ___________ –Slope of the distance vs. time graph –Can be read directly off a speed

Speed • Def: How fast you change position (distance traveled per unit time) –Scalar Quantity –Unit: meters per second (m/s) –Slope of the distance vs. time graph –Can be read directly off a speed vs. time graph

Average Speed • Def: _______________ –Scalar or Vector? –Unit: ____ –Symbol: _______ What is the average speed of object in graph? Use Rise over run

Average Speed • Def: total distance divided by total time –Scalar quantity –Unit: m/s –Symbol: s What is the average Speed? Rise over run

What is the speed of Light? ? • The sun is ______km from the Earth or _____ miles • It takes light _____seconds to travel from the Sun to the Earth in the vacuum of outer space. Memoriz e this • What is the speed of number!

What is the speed of Light? ? • The sun is 150, 000 km from the Earth or 93, 000 miles • It takes light 500 seconds to travel from the Sun to the Earth in the vacuum of outer space. Memoriz e this number! • What is the speed of

Describe the motion in the following graphs based on slope using: “lesser”, “zero”, “greater” _____ velocity _____ velocity

Describe the motion in the following graphs based on slope using: “lesser”, “zero”, “greater” Faster velocity Slower velocity NO (zer 0) velocity