Physics 4A Newtonian Mechanics
May 8: Chp. 7  Energy of a System
1
Review
2
NonUniform Circular Motion
Tangential acceleration changes the
speed of the object as it moves around
in the circle. The net force is found by
adding the radial (centripetal) an
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Physics 4A Newtonian Mechanics
May 15: Conservation of Energy
1
Quiz
1) A spring has a spring constant of k = 75 N/m.
Say you compress the spring by x = 25 cm, by
pushing on it with a 1 kg block. When you let go,
the spring pushes the box forward, and aft
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Physics 4A Newtonian Mechanics
Drag Forces and Frames of Reference
1
Air Resistance
Air resistance is a resistive force, just like friction, and is called the "drag" force. It is more
complicated than friction, though. The drag force depends on the veloci
Physics 4A Newtonian Mechanics
June 14  Chp. 13: Universal Gravitation
1
Universal Gravitation
g = 9.8 m/s2 is specific to the earth's surface, it is not a universal constant.
In general, the force of gravity that one object exerts on another is:
m1 m2

Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Physics 4A Newtonian Mechanics
May 3rd: Chp. 6  Circular Motion
1
Review
Is an object that moves with constant
speed in a circle accelerating?
Why or why not?
2
Midterm
Individual portion, 1 hr. 15 min.
Group portion, 30 min.
Includes drag forces and cir
Physics 4A Newtonian Mechanics
Chp. 9  Linear Momentum
1
Review
Ugrav = mgh
Uspring
K+
1 2
= kx
2
K+
1
K = mv 2
2
U =0
U = Wext
P = F~ ~v
dE
P =
dt
2
Work and Power Example
How much work must you do to overcome gravity and lift a refrigerator by h meters
Physics 4A Newtonian Mechanics
Chp. 9  Impulse, and practice problems
1
Quiz
1) A bullet is fired into a wooden block, where
it sticks. The block is hanging at rest from
ropes, and swings up after being hit, like
shown in the picture. What is the height
Physics 4A Newtonian Mechanics
Syllabus and Chp. 2  1D Motion
1
Course Syllabus
Structure of each class:
Mix of discussions, lectures, and problem solving.
I suggest writing notes about all 3.
Lecture slides and notes will be posted online.
Write on whit
Physics 4A Newtonian Mechanics
Chp. 3  Vectors and Chp. 4  2D Motion
1
Review
Position, velocity and acceleration, and how they relate
1 2
x = x0 + v0 t + at
2
v = v0 + at
vf2 = vi2 + 2a(xf
2
xi )
Vectors
Position, Velocity and Acceleration are all vect
Physics 4A Newtonian Mechanics
Chp. 5  Newtons Laws, continued
1
Quiz
m1
1) Two forces (and no others), F1 and F2, act on a 5
kg object. If the magnitudes of the forces are F1 = 20
N and F2 = 15 N, find the acceleration vector of this
object for each of
Physics 4A Newtonian Mechanics
Chp. 5  Newtons Laws, continued
1
Newton's Laws  2nd Law
An object's change in motion (acceleration) is proportional to the
net force applied to it.
F~ = m~a
Where m is the object's mass in kg. This equation means that if
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by Ca
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Physics 4A Newtonian Mechanics
Kinematics Problems and Chp. 5  Newtons Laws
1
Quiz
1) Sketch the velocityvstime graph from the
following positionvstime graph, from t = 0s to t = 2s.
2) A ball is launched straight up from the ground.
Ignore any fricti
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Physics 4A Newtonian Mechanics
More Newtons Laws examples and Drag Forces
1
Review
Tension  a pulling force, usually through a string or rope, acts parallel to the rope.
Friction  static and kinetic, acts parallel to the surfaces of contact.
2
Tension E
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner