Measuring MotionDay 1

Objectives● I will identify the relationship between motion and a reference point ● I will identify the two factors that speed depends on ● I will determine the difference between speed and velocity ● I will analyze the relationship of velocity to acceleration● I will interpret a graph showing acceleration

Key Terms ● Motion ● Distance● Displacement ● Instantaneous speed ● Constant speed ● Speed ● Velocity ● Acceleration

Measuring Motion

Lit Circles- Everyone has a task… (20 minutes) ● Row 1

○ Observing motion ● Row 2

○ Speed Depends on Distance and Time ● Row 3

○ Velocity: Direction Matters (p. 110-111) ● Row 4

○ Acceleration: The Rate at Which Velocity Changes p. 112

● Row 5 ○ Acceleration: The Rate at Which Velocity

Changes (p. 113-114)

● Tasks- 1 per person ○ Summarizer (1-2 people)○ Questioner/Discussion Director ○ Connector ○ Illustrator (1-2 people)

Lit Circles- Let’s Share ● Summaries need to be written on the

board ● Pictures under the summary ● Discussion Director- present

information and connections made in the discussion

● Row 1 ○ Observing motion

● Row 2○ Speed Depends on Distance and Time

● Row 3○ Velocity: Direction Matters (p. 110-111)

● Row 4○ Acceleration: The Rate at Which Velocity

Changes p. 112● Row 5

○ Acceleration: The Rate at Which Velocity Changes (p. 113-114)

Things to Do ● Homework

○ Section Review p. 111 & 114 ○ write all questions

● Assessment ○ Section Quiz Monday 1/11

Measuring Motion Day 2

Objectives● I will identify the relationship between motion and a reference point ● I will identify the two factors that speed depends on ● I will determine the difference between speed and velocity ● I will analyze the relationship of velocity to acceleration● I will interpret a graph showing acceleration

Key Terms ● Motion ● Distance● Displacement ● Instantaneous speed ● Constant speed ● Speed ● Velocity ● Acceleration

Essential Question Are distance and time important when describing motion?

Describing Motion ● Motion: occurs when an object changes position relative to a reference

point ● Distance v. Displacement

○ Distance- how far an object has traveled ○ Displacement- distance and direction of an object change in position from starting point

● Speed- the distance an object travels per unit time rate of change on position

● Average (avg) speed (v) = total distance (d)/ total time (t) ○ v=d/t

Types of SpeedType of Speed Description Example

Instantaneous speed of any given point in time

driving a car and looking down at the speedometer

Average total distance traveled divided by total time

taking a road trip

Constant speed that does not vary putting a car in cruise control

Let’s Try a Problem If you take a walk for 1.5 hours and travel 7.5 km, what is your average speed?

Graphing Motion ● Motion of an object can be plotted on a distance - time graph

○ x axis- time ○ y axis- distance

● The slope of a line on a distance - time graph gives the speed of an object in motion

Formula Triangle Foldable

Things to Do ● Homework

○ Complete Formula Circle & Questions● Quiz

○ Monday 1/11

Measuring Motion Day 3

Essential Question What is the difference between positive and negative acceleration?

Acceleration ● Velocity- includes speed of an object and the direction of its motion

○ Question: what is the difference between speed & velocity? ■ Velocity includes direction whereas speed does not.

● Acceleration- rate of change of velocity. acceleration occurs when an object changes speed, its direction, or both.

Calculating Acceleration

Note: Change in velocity = final velocity - initial velocity

acceleration formula = a=vf-vi/t

Acceleration ● Positive Acceleration

○ A plane takes off…■ Final Velocity = 80 m/s■ Initial Velocity = 0 m/s■ Time= 20 s

● Negative Acceleration ○ A bike comes to a stop

■ Final velocity = 0 m/s ■ Initial velocity = 3 m/s■ Time = 2s

Practice Problems: Acceleration

Things to Do ● Study Guide:

○ Define Key Terms ○ Know how to use the Speed Formula○ Know how to use the Acceleration

formula ○ Know the difference between

acceleration and velocity ○ Know the difference between positive

and negative acceleration

● Quiz ○ Section Quiz 1/11