Physics 4A
Foothill College
Lab 2
Lab Two - Exercises in Uncertainty
A key concept in any lab science is the uncertainty in measurements. No instrument or
method is a perfect tool. No matter how expen
Phys 4A
Worksheet projectile motion
1. As a ship is approaching the dock at45.0 cm/s , an important piece of landing equipment
needs to be thrown to it before it can dock. This equipment is thrown at1
Phys 4A Problem Set #1 - Quiz on Apr. 17
Problems are from University Physics from openstax: https:/openstax.org/details/books/
university-physics-volume-1
Chp. 3 (1D motion):
Conceptual: 5, 8, 9, 14,
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
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 m
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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 o
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
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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
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 be
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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
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Physics 4A Newtonian Mechanics
Kinematics Problems and Chp. 5 - Newtons Laws
1
Quiz
1) Sketch the velocity-vs-time graph from the
following position-vs-time graph, from t = 0s to t = 2s.
2) A ball is
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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 i
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, f
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 )
V
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.
Lectur
Problem Set 1:
1) If an object has a velocity of 0 at one instant in time, what is its acceleration? a) 0
b) 9.8 m/s2 c) not enough information
2) If you know the acceleration of an
object, do you ha
Problem Set 6: Momentum and Energy
1) Two blocks are connected by a spring, with spring
constant k = 50 N/m. A rope holds the two blocks together,
with the spring compressed by 15 cm from its equilibr
Problem Set 4
Drag and Circular Motion
1) Say that you are spinning a ball attached to a string in a vertical circle. Where in the loop is
the force of tension the greatest?
2) In the moment after a s
Problem Set 5 - Conservation of Energy
1) Say you place a ball on a vertical spring. Take the system to be the ball, the earth and the
spring. As the spring compresses down from the weight of the ball