1. Matter is Made of Atoms
Find the number of atoms in a
? First you must know the mass of the object and the type of atom
I kng lead a sphere
209 nucleons Pby milkg
m= mass of lead bull
: 1 kg
Nauc= 200 nucleons/atom
Nmuc: # of nucleons If you want to learn more check out In ancient greece, where was the sanctuary of apollo located?
1. per atom
: 207 auckons latom Im Auc= mass of a nucleon
01.6910-27kg /nuelion N Noct of nucleons in the ball
First find of nucleous in the ball. Use a unit arguement. Since the
Magnucleon - # of nucleons) Don't forget about the age old question of What are vertical asymptotes?
# of atoms in the ball
1.69x1091kgh Now find the number of atoms in the ball = 5.988+1026 nucleons
Vic a unit arguement
Since nuctions Iball - utom an
nucherul atoms ball
: 5.988 = 1024 nuclens
207 hooleons /atom =2.8128 x 1024 atoms In 3 trillion trillion)
Understand how to find protons and neutrons. (Understand periodic table) We also discuss several other topics like What are the sources of socialization?
2. Universal Gravitation
Not to scale
Consider a ball of mass m in contact with nothing near in Earth's surface
i Up me Find size of the Acc. o
- y Acc. (FG, ME
Perly and Law for
Mare in makes no difference
n man mo
- 9.80 Wien
= 9.80 kg mle" lega mer
Mass Is resistance to ACC, or INERTIA. More mass means bigger GRAVITY FORCES, but also bigger RESISTANCE to ACC => amount of ACC ( under GRAVITY alone) does not change.
Shortcut to find weight:
weight of mass
m at Earth's surface
= 9 Earth = 9.8m/s2 ir Mem
Mars 9 Mars = GM = 3.8 m/s2 Moon Grom Germany - 1.6 m/s2 We also discuss several other topics like Who defined what a pirate was in british atlantic colonies?
3. Coulomb's Law- Like charges repel; unlike charges attract
Be able to add the arrows and determine the force.
R F = 0
C FOR B
A FB C
+ CA -
Falipote, c r repelled
Edipolo, c~ attracted
4. Velocity is speed with a specified direction. Galileo's Famous Experiment.
5. Newton's First Law
• An object has a constant velocity. If and only if the total force acting on the object is 0.
• All forces in the visible world are either gravitational or electromagnetic repulsion (EM). For neutral objects the EM forces is only
significant when the objects are "in contact".
• Understand force diagrams.
• In-class example:
For BE = weight of block
-15 N For = size of force on B by ī
Vee Newtonie 12 law of motion. Since the Vel. of Bis constantly vero, the total force on B is jew. B only touches the I, so there are only two forces to add. By ADD the ARROWS, =) the force om bliy Tie UPWAROS, and
Per lege- na sample of Newton's
- 15N 1st Law of Motion
The force on the B by I is 15 N Upwards
6. Acceleration is the RATE of CHANGE of Vel.
acceleration - amount
amount of position change
7. Newton's Second Law (check problem in Universal Gravitation)
i. Non-zero total forces are the cause of any and all accelerations. ii. Direction of Acc. and Dir. of total force are the same. iii. Amount of Acc. is the amount of total force divided by the object's mass
m or Fnet=ma
• In class examples:
Jewelry case (J) Riding on MGR (M)
At a constant spred
is for ft Fact
If mass of C is 100kg, and the amount of Acc. is 15 cm/s2= .15m/s2, find the strength of the net force on the C.
- Picture above Mee Newton's and Law.
m = mass of C
-100leg a= amount of Acc.
= 15 cm/2 That size of the total force on the
(100kg X. 15 m/se)
= 15 kg-m/ga
-15N This means the force of the cabinet by the hande is 15N stronger than the
ional force by the floor.
*12 multiple choice questions and 2 written questions*