Download F net = 0

5/3/2017
Learning Target: SWBAT explain the
relationship between force & mass
What is the net force acting on the car?
What do you think will happen to the cars
motion as a result?
10,000N
Schedule:
• Entry Task
• Pre-Test
• Newton’s 2nd law Notes
• Practice Questions
8,000N
Pretest (9 points)
1. Explain each variable in the formula, Fnet = M x A, as it relates to
Newton’s Second Law of motion. (1pt. Each)
•
Fnet –
•
M–
•
A–
2. If force increases and mass remains constant, what effect will
there be on acceleration? (1)
3. If Force stays the same, and mass increases, what effect will
there be on acceleration?(1)
4. What happens when Fnet = 0 ? (1)
5. If you could provide a constant net force of 1 N on a sailboat, what
would the top speed be? (1)
6. Two students pull a 10 kg desk with 10 N and 25 N. what is the
acceleration of the desk? (2)
 Net force is all forces
acting on an object
combined
 When Net Force is 0
20 N
10 N
 An object will not
change motion
 When Net force is not 0
 An object will change
motion
 Since Net Force is the
sum (addition) of all
forces acting on an
object…
 ADD/Subtract forces!
 Adding Forces Worksheet
 Glue into your notebook
 Write answers on sheet
 Due monday
5/3/2017
Learning Target: SWBAT explain the
relationship between force & mass
What is force? What is net force? What is
the net force of the following?
10,000N
Schedule:
• Entry Task
• Pre-Test
• Newton’s 2nd law Notes
• Practice Questions
8,000N
 The Net Force applied
to an object will be
equal to that objects
mass times the
acceleration of the
object
 Fnet=MxA
 Any increase to net
force is proportional to
an increase in either
Mass or Acceleration, or
both
Fnet
Acceleration
 If mass is constant…
 The harder your push
an object, the faster
that object will speed
up.
 Example – If you put a
large V-8 engine in a
golf cart, It will have a
much faster 0-60mph
time
 If mass does change…
 If a net force is applied
to two object of diff.
mass, the object with
less mass will
accelerate faster.
 Example – Same V-8
Engine in a big rig truck
will have a much slower
acceleration.
 If there is no Net Force acting on an object (all forces
cancel out) the object will not accelerate
 It will stay at constant velocity
 Newton’s first law – “an object will keep its current
motion unless acted upon by a net force”
Thrust
Air
Resistance
a) Zero
b) 1m/s
 If you could provide a
constant net force of 1N
on an ocean liner, what
would the top speed
be?
100m/s
d) Light speed
c)
 What does Newton’s 2nd
Law Mean?
 Make a Newton’s
2nd Law poster
 Must have…
 Definitions
 Force
 Net Force
 Mass
 Acceleration
 Relationship statement
 Fnet & Acc
 Newton’s 2nd Law
5/3/2017
Learning Target: SWBAT explain the
relationship between force & mass
How does varying the amount of force
applied to an object effect that objects
motion?
 Fnet = Net Force
 M = Mass
 A = Acceleration
 So…
Fnet  M  A
How do I use f=ma to
solve for problems?
 Mr. Simonson & Mr.
Dorsey are fighting over
a giant strip of bacon.
What is the acceleration
of the bacon?
 Newton’s 2nd law
Practice Questions
 Answer Each Question
 Complete sentences
 Show ALL work
 Steps for solving
 Draw a Picture
 Write Knowns &
Unknowns
 Use Triangle To Solve
 Check Answer
Fne
t
M
A
5/3/2017
Learning Target: SWBAT use Newton's
2nd Law
Spongebob & Dora are fighting over the
stores last copy of the Jonas Brothers
CD(m=5kg). What is the net force on the
CD, and acceleration?
Schedule:
•
 Questions & Clear Ups
 What do you still have
questions about?
 Any problems a
problem?
Popcorn Read 4.1
 Take turns reading 4.1
 At Each Section
After Reading
 Section Wrap-Up
 1–3
 Discuss Main Ideas
 Write out a fictional
 Cornell note (at least
story that demonstrates
& explains Newton’s 2nd
law.
(at least 1 paragraph)
two questions per
section)
 Sections
 Newton’s 2nd Law
 Falling Objects
 Terminal Velocity
5/3/2017
Learning Target: SWBAT apply Newton's
2nd to using an elevator
Imagine yourself on an elevator, when it
first goes up, what do you feel? When it
suddenly moves down, what do you feel?
Try to explain this using Newton’s 2nd law
Schedule:
•
 Purpose:
 To investigate the
relationship between
force & mass
 Possible Materials:
 Dynamics Cart, String,
Spring Scale, Mass Set
250kg
250kg
Force
Mass
Motion
Elevator
 Claim…
 What is the relationship
between mass,
acceleration & force?
 Evidence…
 Qualitative
 Quantitative
 Reasoning
 Why is your claim
correct? Or wrong?
Prove it!!
Cart Pull
5/3/2017
Learning Target: SWBAT apply Newton's
2nd to using an elevator
Imagine yourself on an elevator, when it
first goes up, what do you feel? When it
suddenly moves down, what do you feel?
Try to explain this using Newton’s 2nd law
Schedule:
•
Today’s Assignment
 Create & solve three (3)
original problems using
any aspect of Newton’s
2nd law.
Assignments To
Finish/redo
 Test Reflection
 Unit Reflection
 Newton’s 2nd Pretest
 Newton’s 2nd Cornell
notes
 Newton’s 2nd Practice
Question
 4.1 Reading/Notes
 Newton’s 2nd Fictional
Story
5/3/2017
Learning Target: SWBAT apply Newton's
2nd law
Q-Pon (95kg) puts a net force
on the ground of 190N as he
jumps up to slam the ball in
the face of the lobos. What
is his acceleration? –show
ALL work
Newton’s Ride
 Question
 What is the relationship
between mass,
acceleration & force?
 Complete lab planning
 Carry out plan
 Record observations
 Conclusions
 RACES
Assignment log
 Test Reflection
 Unit Reflection
 Newton’s 2nd Pretest
 Newton’s 2nd Cornell
notes
 Newton’s 2nd Practice
Question
 4.1 Reading/Notes
 Newton’s 2nd Fictional
Story
5/3/2017
Learning Target: SWBAT apply Newton's
2nd law
Q-Pon (95kg) puts a net force
on the ground of 190N as he
jumps up to slam the ball in
the face of the lobos. What
is his acceleration? –show
ALL work
Quiz Review
 Each Group…
 Make a practice test
question
 Multiple step
 Solvable
 Make a key
 Shows ALL steps
 Correct answer
 Share/teach question
with class
Remember Your Steps
 Draw a Picture
 Force diagram
 Find net force
 State Knowns &
unknown
 Use Triangle
 Solve, check & label
Presenting Group
Class
 Speak Clearly
 Write Question in
 Introduce Question
notebook
 Solve while following
steps
 Give Time To Solve
 TEACH each step using
key & audience
 Draw
 Knowns
 Triangle
 Solve & check
 Be respectful
5/3/2017
Learning Target: SWBAT apply Newton's
2nd law
In order to land, a plane must cut its
thrusters to create an unbalanced
force. The weight of the plane is
200,000N & air resistance is 50,000N.
If the plane can safely slow down at
5m/s2, what is the mass of the plane?
weight
Air
Res.
Assignment Log
Newton’s 2nd Pretest
/4
2nd Law in action Poster
VPearned
Score 
4
VPTotal
Newton’s 2nd Practice
Questions
/4
4.1 Reading/Notes
/4
Newton’s 2nd story
/4
VP
/20
Score
/4
Assignment Log
 If you are ready to
score…
 Total Score out of 4
 Keep journal on edge
of desk
 I will check during quiz
When Done…
• Missing/Late/Redo Work
• Test Retake Procedures
• Silent Read
Quiz
 Answer in complete
sentences
 Show ALL work
 Good Luck!
 Pay Close Attention…
 Fold into 4th
 Hotdog
 Hamburger
 Trim edges
 Fold again (hamburger)
 Take half
 Cut a “divot”
 Cut a T
 Insert & Walla!
 Use this time to
complete your website
 What you should
have…
 Title
 Group members
 Purpose of lesson
 At least one of each
 Picture
 Link (hidden)
 Embedded Video
 Your own text