Bellwork: Page 464 #6 Set up for Cornell Notes

Assignment: Vector - Scalar Cornell Notes

SC.912.P.12.1 Distinguish between scalar and vector quantities and assess which should be used to describe an event.

Scale4: Extra Credit Extension: Design an

experiment using an everyday physical activity that will provide data, develop

graphs to analyze vector and scalar quantities (One page with data chart and

graph. 5-points)

3: I can describe the differences between vectors and scalars and when to use them.

2: I can describe the differences between vectors and scalars

1: I can define vectors and scalars with help from the textbook.

Vector & Scalar Quantitieshttps://www.youtube.com/watch?v=ihNZlp7iUHE

What is a Scalar Quantity? Only has magnitude Requires 2 things:

1. A value2. Appropriate units

What is a Vector Quantity? Has magnitude (size, amount) & direction Requires 3 things:

1. A value2. Appropriate units3. A direction!

Exit Slip: On index card, write your name.Draw the t-chart and sort the measurements using your chart

Scalar Vectors

30 mph

50oC120 lbs

5 Blocks

East

Falls 5 degrees

2.5 m/s

North

3pm

More about Vectors A vector is represented on paper by an arrow

1. the length represents magnitude2. the arrow faces the direction of motion3. a vector can be “picked up” and moved on the paper as long as the length and direction its pointing does not change

Graphical Representation of a VectorThe goal is to draw a mini version of the vectors to give

you an accurate picture of the magnitude and direction. To do so, you must:

1. Pick a scale to represent the vectors. Make it simple yet appropriate.

2. Draw the tip of the vector as an arrow pointing in the appropriate direction.

3. Use a ruler & protractor to draw arrows for accuracy. The angle is always measured from the horizontal or vertical.

Understanding Vector DirectionsTo accurately draw a given vector, start at the second direction and move the given degrees to the first direction.

N

S

EW

30° N of E

Start on the East origin and turn 30° to the North

Graphical Representation Practice 5.0 m/s East

(suggested scale: 1 cm = 1 m/s)

300 Newtons 60° South of East(suggested scale: 1 cm = 100 N)

0.40 m 25° East of North(suggested scale: 5 cm = 0.1 m)

Graphical Addition of Vectors (cont.)5 Km

3 Km

Scale: 1 Km = 1 cm

Resultant Vector (red) = 6 cm, therefore its 6 km.

Vector Addition Example #1 Use a graphical representation to solve the

following: A hiker walks 1 km west, then 2 km south, then 3 km west. What is the sum of his distance traveled using a graphical representation?

Vector Addition Example #1 (cont.)

Answer = ????????

Vector Addition Example #2 Use a graphical representation to solve the

following: Another hiker walks 2 km south and 4 km west. What is the sum of her distance traveled using a graphical representation? How does it compare to hiker #1?

Vector Addition Example #2 (cont.)

Answer = ????????

Assignment: Vector - Scalar Cornell Notes

SC.912.P.12.1 Distinguish between scalar and vector quantities and assess which should be used to describe an event.

Scale4: Extra Credit Extension: Design an

experiment using an everyday physical activity that will provide data, develop

graphs to analyze vector and scalar quantities (One page with data chart and

graph. 5-points)

3: I can describe the differences between vectors and scalars and when to use them.

2: I can describe the differences between vectors and scalars

1: I can define vectors and scalars with help from the textbook.

Read Page 473

Acceleration Speed is the rate of change of position. Acceleration is the rate of change of velocity.

What form of measurement is acceleration, scalar or vector?

Hint:

Acceleration• Acceleration is a vector which measures the change in

the velocity of an object.• It has magnitude and direction.• This means acceleration could be any of the following

three…1. a change in speed, the magnitude of the

velocity (from 34 km/h to 67 km/h)2. a change in direction (from East to North-

East)3. a change in both speed and direction (from

34km/h East to 12 km/h West)

Average Acceleration Equation

Acceleration Formula

Acceleration = Velocityf – Velocityi

Time

Negative Acceleration In physics, acceleration is not always an

increase in velocity. It can also be a decrease in velocity.

Even though you might have heard people use the word deceleration to describe an object slowing down, this isn’t really proper physics.

Negative Acceleration• We usually visualize speeding up as positive,

and slowing down as negative. • A positive velocity means it’s going in the

positive direction (like forwards), and a negative direction is backwards.

Practice: Physics to go Page 128 #3-6