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Physics - Motion!
Transcript of Physics - Motion!
1. What causes motion?
2. How can we describe the "absolute motion" of an object?
1. Inertia - An object at rest tends to stay at rest, while an object in motion tends to stay in motion unless acted on by an unbalanced net force.
Inquiry Lab - Physics Olympics!
Speed - Velocity - Acceleration - Momentum
Scalars vs. Vectors
2. F=ma - The acceleration of an object depends on both its mass and the net force being applied to the object.
3. Action/Reaction - For every action there is an equal and opposite reaction.
a magnitude or quantity
magnitude and DIRECTION
Vectors are represented with arrows...
Lex I: Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum, nisi quatenus a viribus impressis cogitur statum illum mutare.
Lex II: Mutationem motus proportionalem esse vi motrici impressae, et fieri secundum lineam rectam qua vis illa imprimitur.
Lex III: Actioni contrariam semper et æqualem esse reactionem: sive corporum duorum actiones in se mutuo semper esse æquales et in partes contrarias dirigi.
Vectors are ADDITIVE!
Can be combined/simplified
Change in motion
All of the individual parts...
total of all combined...
Do you have to go in order?
Cool Example of Vectors in Action
Vector Addition Examples
Balanced Force (no motion)
Or try the "Tip to Tail" Method...
FRAME OF REFERENCE
Motion "DEPENDS" on your
*See Frame of Reference Prezi...
May the FORCE be with You!
HELIUM TENTPOLE ACTIVITY :-)
A push or a pull causing a change in motion
Speed = Distance / Time
How to measure RATES
(ratios of displaced position over time)
Interactive Flow Chart Notes
Compare and contrast ways we can quantify and measure motion.
Create a flow chart in your journal to organize your book notes on small flappable note cards.
1. Take two index cards and cut them in half.
2. Read the blue motion book (pg. 14 - 29) to analyze the four types of motion below
3. Sketch to Stretch - After reading about each topic, draw a title for each type of motion onto each of your 4 mini notecards
4. Trace the flow chart to the right into your journal (Tip: the boxes should be the same size as your four note cards)
Title Must Include a WORD and PICTURE (based on the paragraphs you read)
Advanced = Word Art: The actual word of each title depicts art that represents the type of motion you read about :-)
Check For Understanding...
Work & POWER!
Definition: Applying a force over a given distance.
Definition: How quickly you can do work - the time it takes you to complete the work.
W = F * D
P = W / t
Newton Meter (kgm/s )
- or - JOULES ( J)
Joules per Second
- or - Watts ( W)
Horsepower = US Units
1. Three students help to push a broken down car to the nearest gas station. They push with a combined force of 1200N. The gas station is 400 meters away. How much work must they do to reach their goal?
1. It took 5000 Newtons of force from an elephant to pull a bale of hay across a field. The field was 500 meters long. It took 30 minutes to get it across the field. How poweful was the elephant?
1 HP = 746 Watts
Motion Graph Analysis
What quantities can
help to figure out the winners of a race?
1. Selection of toys
2. Measuring tape
Numbered list of steps that your group will follow as a strategy when turned loose in the hallway :-)
Complete sentence answers to #1-5 on lab sheet!
Complete sentence answers to #1-7 on lab sheet!