Transcript Newton’s Laws of Motion

Newton’s Laws of Motion
10.01.12
Warm-up
Choose a word in parentheses to complete the
statements.
1. If forces are in the same direction their
magnitudes can be (added, subtracted).
2. If forces are in the opposite direction their
magnitudes can be (added, subtracted).
3. If an object is accelerating or changing
direction, then the forces are (balanced,
unbalanced).
Learning target
• I can explain how inertia and
momentum affect an object’s
motion.
Four-square
(inertia and momentum)
Definitions
Description
Sketches
Relationship
DoL
For each of the statements:
inertia
momentum
both
neither
1. Measure of how hard it
is to stop an object.
2. Air bags and seat belts
help you from getting
injured due to _____.
3. p = (m)(v)
4. A car traveling the same
speed as a bicycle has
more ______.
5. Help to explain
Newton’s Laws of
Motion.
Warm-up
Explain the differences between momentum
and inertia.
Use glossary if necessary
Learning target
• I can summarize Newton’s Laws of Motion.
Newton’s First Law of Motion
Definition
• Balanced forces = no change
in motion
• Unbalanced forces = change
in speed or direction
Explanation
• An object at rest will remain
at rest
• An object in motion will
remain in motion unless
acted upon by an
unbalanced force
Newton’s Second Law of Motion
Definition
• Force = mass times
acceleration
• F=ma
Explanation
• More force to move a more
massive object
• More force to accelerate an
object more
Newton’s Third Law of Motion
Definition
• Every action has an
opposite and equal reaction
Example
• Rowing a boat
DOL
• A runner moves up to the starting line. The
starter fires the gun to begin the race and the
runner takes off down the track. As she crosses
the finish line, she begins to slow herself to a
stop.
– Explain how all three of Newton’s Laws of Motion
apply to this situation. Give specific examples.
Science Fair Brainstorming
• On notebook paper…
– What category are you interested in entering?
•
•
•
•
•
Biology
Health and Behavioral Science
Physical Science
Engineering/Mathematics/Computer Science
Earth Science
– What ideas do you have for Science Fair?
• Testable question
• Potential topics
• Areas of interest
Warm-up
Fill in the blank.
1. __________ forces cause a change in motion
while _________ forces do not.
2. __________ is a measure of how difficult it is to
stop an object.
3. __________ is an object’s resistance to changes
in its motion.
4. __________ equals mass times velocity.
5. Every __________ has an opposite and equal
__________.
Learning Target
• I can explain how Newton’s Laws of Motion
apply to various activities and moving objects.
Example
Mountain
Biking
Newton’s First Law of Motion
If forces are extremely
unbalanced on the front
wheel, then inertia will cause
you to crash.
Newton’s Second Law of
Motion
More force applied to the
pedals results in quicker
acceleration
Newton’s Third Law of Motion
The action of pulling on the
brakes causes the reaction of
the brakes being applied to the
wheels.
Assignment
1. Fold paper into quadrants.
2. Choose an activity or object that involves motion.
3. Sketch a diagram in the first quadrant showing your
activity.
4. In each of the next three quadrants, give a detailed
explanation or specific example of how each of
Newton’s Laws of Motion apply to the activity or
object.
5. Talk with four other students in class and take notes
in each quadrant using the back of the paper.
DOL - matching
1. NFLM
2. NSLM
3. NTLM
a) Also known as the law
of inertia
b) Force equals mass
times acceleration
c) Every action as an
opposite and equal
reaction