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Physics - Motion!

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by

Chris Bergmann

on 7 February 2014

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Transcript of Physics - Motion!

Motion is Relative!

1. What causes motion?

2. How can we describe the "absolute motion" of an object?
Vectors
Newton's Laws
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.
Calculating Motion...
Inquiry Lab - Physics Olympics!
Physics Minute!
Physics in
MOTION!
Speed - Velocity - Acceleration - Momentum
Scalars vs. Vectors
Notes
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
"how much"
"how much"
"which way"
Examples
Time
Temperature
Money
Speed
Examples
Force
Velocity
Acceleration
Vectors are represented with arrows...
How Much
Which Way
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
100m
50m
50m
Components
Resultant
Change in motion
Linear Vectors
All of the individual parts...
total of all combined...
Do you have to go in order?
2
2
3
3
1
1
5
5
START
END
Student Example...
Cool Example of Vectors in Action
Vector Addition Examples
+
1 N
4 N
=
3 N
+
1 N
4 N
=
5 N
+
=
Balanced Force (no motion)
3 N
3 N
Angled Vectors
50 N
20 N
20 N
50 N
20 N
50 N
Parallelagram Rule...
Or try the "Tip to Tail" Method...
Same result!
FRAME OF REFERENCE
Key Questions...
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
Units: m/s
How to measure RATES
(ratios of displaced position over time)
Interactive Flow Chart Notes
Book Notes
Objective -
Compare and contrast ways we can quantify and measure motion.

Task -
Create a flow chart in your journal to organize your book notes on small flappable note cards.

PART ONE:
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
Speed
Velocity
Acceleration
Momentum

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 :-)
Momentum GOLF!
Check For Understanding...
Work & POWER!
WORK
POWER
Related to
Definition: Applying a force over a given distance.
Definition: How quickly you can do work - the time it takes you to complete the work.
Calculation Equation
W = F * D
Work
Force
Distance
Calculation Equation
P = W / t
Work
Time
Power
UNITS...

Newton Meter (kgm/s )

- or - JOULES ( J)
2 2
UNITS...

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?
Example...
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?
Example...
metric
(Not Metric)
1 HP = 746 Watts
Journal Format
Motion Graph Analysis
Physics Olympics
Problem Statement:
Materials:
Procedure:
Data Table:
Analysis Questions:
What quantities can
help to figure out the winners of a race?
1. Selection of toys
2. Measuring tape
3. Stopwatch
Numbered list of steps that your group will follow as a strategy when turned loose in the hallway :-)
Event
Dist.
Time
Conclusion Questions:
Complete sentence answers to #1-5 on lab sheet!
Complete sentence answers to #1-7 on lab sheet!
Full transcript