MONDAY TUESDAY WEDNESDA Y THURSDAY FRIDAY NEWTON’ S 1ST LAW NEWTON’ S 1ST LAW NEWTON’ S 3RD LAW NEWTON’ S 2ND LAW NEWTON’ S 2ND LAW NEWTON’ S LAWS QUIZ
NEXT WEEK: 2ND CHAPTER CHALLENGE PROJECT:
You’ll be working as a consultant to Sikorsky Aircraft Corporation by designing the most efficient rocket design and flying it outside the Fairchild Wheeler
Campus. Prizes will be given to the most artistic rocket and the one that flies for the longest duration. By
doing this project, we will be investigating the
concepts of Projectile Motion, Freefall and Newton’s 3 Laws. Your final two products will be making a 2 Liter Soda Bottle Rocket and a Glogster Presentation
So, what’s next?
We’ve learned
how
things move (speed and
acceleration)
Now, we’ll learn
what
makes them
move.
What causes things
to move?
What is force? How do you
Let’s learn from a toy car
Hypothesize what will happen when
1. The toy car is not pushed 2. The toy car is pushed
3. The toy car is pulled with a rubber band
Experiment
Results
Conclusion—explain what you saw.
What had to happen for the car to move?
Push on it or
Newton’s First Law
Newton’s First Law is also known as the Law of Inertia The law states:
“A body at rest, tends to stay at rest; a body in motion tends to stay in motion, until an external force is applied.”
A force is a push or a pull
It is a vector --> care about direction
An external force means an outside force is being put on the
object
Examples:
pushing against a wall pulling a sled
To simplify it…
A body at rest… (not moving)
will continue not moving
A body in motion (moving)
Who is this Newton guy anyway?
Isaac Newton was
born on Christmas day of 1642 (died in 1727)
He was the Einstein of
the 1600s. At 24 years old, Newton developed his famous laws of
motion, replacing 2000 years of thought.
He also discovered
gravity
You will know his name
Demonstration
Hypothesize what will happen when Mr.
Anthony pushes down on the book
Experiment
Results
Conclusion—explain what you saw.
Why didn’t the book move even though an
Equilibrium
Objects move only if the net force is not zero.
The sum of all forces acting on an object is called
the net force.
When all the forces on an object balance out, the
object is in equilibrium.
When an object is in equilibrium it means it will stay at a constant velocity
This is why it’s important to draw a picture! So
we can figure out what the net force is (forces are vectors so direction is important!)
What is the net force on a book with 30 N of
Demonstration
Hypothesize what will happen when Mr.
Anthony pushes the toy car across
Experiment
Results
Conclusion—explain what you saw.
Why did the car stop? Isn’t it suppose to keep
If only…
Many physics concept and laws we learn assume
an ideal world.
But sadly, we don’t live in an ideal world because
there are other things at work.
Newton’s First Law says an object in motion will
continue in motion unless another force acts on it, many times in real life that force is known as
friction
Friction is a force that stops an object from moving In physics, we are going to pretend we’re in an ideal
Demonstration
Draw and describe what I have set up Hypothesize what will happen if
Mr. A pushes on the chair with the book on it
Mr. A pushes on the chair with the book on it and then suddenly stop the chair
Experiment Results
Conclusion—explain what you saw.
What happened to the book when Mr. A suddenly stopped the chair?
Can you use Newton’s First Law to explain it? The book kept moving when the chair stopped
Inertia
Inertia is an object’s “laziness” or
resistance to change in motion
Inertia is determined by an object’s
mass
Mass is the amount of stuff in an object
and measured in grams, kilograms and milligrams
Mass is not weight
Demonstration
Draw and describe what I have set up.
Hypothesize what will happen when Mr.
Anthony kicks the cake pan out
Experiment
Results
Conclusion—explain what you saw.
Why did the egg fall into the glass and not fly
LAW OF INERTIA IN THE
WORLD AROUND US...
Stay tuned tomorrow!
For more real world
Get Ready for The BOOM Bag
Get Ready for the BOOM.
DIRECTIONS for The BOOM BAG:
1. Play in your table teams!
2. Go around the room and pick a question from the BOOM BAG 3. Everyone in the room writes down the question in their notebook 4. 30 seconds for each team to come up with an answer
5. If answer is not right, move on to next team. 6. Correct answer gets points on back of card 7. Harder question = more points
8. If you get the strip/s with the word BOOM, your team loses half their points
