Chapter 5 Applications of the Laws of Force and Motion

Funny/interesting things you
said about yourselves
• Favorite book: George’s Marvelous Medicine by Roald
Dahl
• I always try to sit in the front...I’m easily distracted
• Published a book of poetry “Stretched Into Shadow
•
•
•
•
•
With No End”
I am terrified to take this class
I have 15 people in my family
I like playing extreme spoons (the card game)
I have a “hello kitty” toaster that toasts her face into
the bread
I’m the 61st of my Grandmother’s 104 grandchildren
Laws of motion
Interactions ! Forces
Gravity
Magnetism
Electromagnetic
Newton’s Law
of Gravitation
Coulomb’s Law
of Electric Force
Strong/weak
Nuclear
Contact forces
Chap. 5 Application of the Laws
of Force and Motion
Quizlet #1&2
Contact forces and
friction
Example: Standing on a Scale
A scale measures the
contact force between
the person and the
scale.
How does the scale
work?
Example: Elevator
Describe the forces,
acceleration, and
speed at each stage of
the ride
At rest or moving
at a constant speed
Elevator Quizlet #1&2
Example:
Jumping
(same as a
projectile)
Jumping Quizlet
Describe the forces,
acceleration, and
speed at each stage of
the jump.
Train and fly
(relation to air friction)
What does Newton’s 3rd law
tell us about the forces on each
at the time of collision?
(Newton’s 3rd Law)
Ftr = Ffly
(Newton’s 2nd Law)
Force of the train
on the fly
=
Force of the fly
on the train
What can we say about the accelerations?
mfly
atr =
afly
mtr
Acceleration of the train compared
to the fly is tremendously small
But what if there were billions of flies...?
F = ma
mtr atr = mfly afly
mfly
atr =
afly
mtr
Another Example: Orbits
Orbit Quizlet
Synthesis Quizlets