Unit 2: Objects in Motion
Monday, Sept. 21st, 2015, EQ#3 Block#1
EQ: What are the top two things that you learned about the scientific method from the review of the quiz?
Answers vary
AA: “Does a runner who drinks Gatorade before a race, finish a race in less time?” Write a 3-5 step procedure that could test this question.
Drink Gatorade/Drink water
Run the race
See what time you finished the race
Vocabulary
Symbol: a letter used to represent something in shorthand Ex: (4+2=6 vs. four plus two equals 6)
Delta: a Greek letter that stands for “a change in something” symbol is ∆
Unit: the specific idea that is being measured Ex: 65 mph
Second: basic unit of time
Meter: the basic metric unit of distance
Position: a specific location
Distance: the length traveled between two positions (∆d) measured in [m]
Time: a human method used to put events in the correct order (∆t) measured in [s]
Speed: the change in distance over time (v) measured in [m/s]
Velocity: the change in distance over time with a direction (v) measured in [m/s]
Acceleration: the change in velocity over time (a) measured in [m/s2]
Gravity: a special type of acceleration caused by Earth and it points down (a g
) measured in m/s2
Reference point: a position used to tell if another object is moving

Tuesday, Sept. 21 st , 2015, EQ#3 Block#2
EQ: How can you use a reference point to determine if an object is moving or not?
Changing if moving, not changing if not moving
AA: List the three devices in a car that are used to change the motion of a car.
Gas pedal: speeding up, brake pedal: slowing down, and steering wheel: changing directions
Wednesday, Sept. 23, 2015, EQ#3 Block#3
EQ: What are the three ways to accelerate, and the two ways to not accelerate?
AA: Decode the following symbols by writing them out:
∆t ∆d ∆v a g
A change in time, a change in distance, a change in velocity, and acceleration of gravity
AA: What is the point to writing things with symbols? What is the point to including a unit of measurement after a number?
Symbols are easier to write and faster and so you know what you are writing about.
Units are used with numbers so that you know what the number represents.
The Five Types of Motion
1.
At Rest (v=0)
2.
Constant Velocity: speed and direction stay the same
3.
Speeding up: going faster
4.
Slowing down: going slower
5.
Change in directions: turning
Laboratory Carousel: Types of Motion
1.
Name of object
2.
Not accelerating or accelerating
3a. If not accelerating: at rest of constant velocity
3b. If accelerating: speeding up, slowing down, or changing directions

Example:
1.
Tissue Box
2.
Not accelerating
3.
At rest
Lab Results:
1.
Black car, 0 acceleration, constant speed
2.
Ball, acceleration, speed up
3.
Z-car, acceleration, slow down
4.
Rattleback, acceleration, change directions
5.
Balancing bird, 0 acceleration, at rest
6.
Newtons cradle, acceleration, slow down, change direction, and speed up
Friday, Sept. 25 th , 2015, EQ#3 Block#4
EQ: How can you identify if an object A) at rest, B) moving at a constant velocity, and C) accelerating on a position graph?
Rest=flat straight line
Constant velocity=diagonal lines
Acceleration=any time the slope changes direction
AA: Draw a reference point and a moving object. Write a sentence explaining how the distance between the reference point and object, proves the object is moving.

The car is moving. This is proven because distance between the car and the lamp post is getting smaller.
Position Graphs:

You can read position, time, velocity, distance, and acceleration

Position is found by reading the y axis: at

Time is found by reading the x axis

Diagonal lines represent constant velocity moving forward moving backwards

Level lines represent at rest

The slope of the line equals the velocity of the object
Slope=rise/run Slope=velocity
More steep means higher velocity
More flat means lower velocity

Acceleration happens any time the slope changes
Speeding up happens when slope increases.
Slowing down happens when slope decreases.
Changing directions happens when slope changes from diagonally up to diagonally down.

The Effect of Acceleration on Motion
•If velocity and acceleration are pointed in the same direction, then the object speeds up
•If velocity and acceleration are pointed in opposite directions, then the object will slow down
Monday, Sept. 28, 2015, EQ#4 Block#1
EQ: What type of lines show moving forward, moving backward and at rest on a position graph?
Forward:
Backward:
Rest:
AA: Use the slope equation slope=rise/run to find the speed of the object between A) 0 and 5 seconds, and B) from 10 and 20 seconds.
A) Slope = 30/5 = 6 [m/s]
B) Slope = -20/10 = -2 [m/s]
Monday, October 5 th , 2015, EQ#4 Block#2
EQ: What does gravity do to a ball as it’s a) rising, b) stopped at its highest point, and c) falling? a) Slowing down b) Speeding up c) Change in direction
AA: Write three different ways to change this velocity: 20 [m/s] to the North. What must the object do to change its velocity?
20 [m/s] South: change in direction
10 [m/s] North: slowed down
30 [m/s] North: speeding up