position ri =(2m)i+(3m)j,toapositionf rf =(4m)i(3m)j?
Solution:Oneapproachistoassumeapathfrom ri to rf anddothelineintegralaccordingly.Another
Lecture 4 Summary
Vectors have magnitude & direction:
Using vectors is essential in to describe motion, forces, etc.
We represent vectors as a line with an arrow at one end:
We represent quantities that are vectors by putt
Lecture 2 Summary
Displacement is NOT distance
displacement in 1dimension = xfinal- xinitial
displacement can be zero even though distance is not zero
Speed= distance/time (m/s)
Average Velocity = displacement/time (m/s)
average velocity = (x
Start quiz on the hour, end after 18 minutes
Rec. Instructor: Guidry, Leonard, Langmack,
E. Smith, G. Smith, Archana, Dainton, Large
1 meter (m) = 3.281 feet 1 mile = 5280 feet 1 hour =3600 seconds |g|=9.80m/s2
Lecture 1 Summary
Units are important !
(meters, seconds, kilograms), (feet, seconds, slugs)
We can convert units: 1 hour = 3600 seconds
1 meter = 3.281 feet
units must be consistent: 1 foot + 1 meter = ?
Dimensions must be consistent: 1 mete
Lecture 5 Summary
1st commandment of vector addition/subtraction:
OK to multiply a vector by a scalar:
If A has components: (Ax, Ay) then sA has components: (sAx, sAy) Vector subtraction has s= -1
Can also mult
Lecture 6 Summary
Kinematics in 2 dimensions: constant a
x(t ) x0 = (v0 x + v x (t )t
x(t ) x0 = v0 x t + a x t 2
v x (t ) = v0 x + a x t
y (t ) y0 = (v0 y + v y (t )t
y (t ) y0 = v0 y t + a y t
v y (t ) = v0 y + a y t
P131 Practice MIDTERM
WARNING: This is NOT the real exam. Do this exam at your own risk.
The real exam will be different!
The midterm will h ave 8-11 multiple choi ce que stions a nd 2 s how work
problems. H owever, t o gi ve you pra ctice I ha ve i nclud
P131 Practice Final
WARNING: This is NOT the real exam. Do this exam at your own risk!
Im not responsible if your head explodes after you look at this. The real final exam will
The final exam will have multiple choice questions and 4 show wo
Lecture 12 Summary
Uniform Circular Motion:
Motion of an
object traveling at constant speed on a circular path.
Velocity of the plane is not constant in time since its direction
(displacement) is changing.
Since velocity is not constant i
Lecture 11 Summary
Applications of Newtons Laws
Inclined Plane: One of the great labor saving
devices invented a long time ago. An inclined plane is a
simple machine. Simple machines include the pulley & lever.
Components | & to
Lecture 10 Summary
Frictional Force: The parallel component of force
that a surface exerts on a body with which it is in contact
Direction of friction: acts in a direction to make the sliding stop.
From Newtons 3rd law frictional forces come
Lecture 9 Summary
Every particle with mass exerts a force
on every other particle with mass. This force is a ttractive.
On & near the surface of
the earth Weight: W=mg
The perpendicular component
of force that a
Lecture 8 Summary
Forces & Newtons Laws (1686)
Description of Forces
contact forces: pulling, pushing, lifting
action at a distance forces: gravity, electro-magnetism
Newtons 1st Law (law of inertia)
An object continues in a state of rest or
hofessor Frank De l.ucia
Instructor circle one(1 pt)
Thereare4 pagesto this exam(plus an equation
Thereare 7 pages this exarn(plus this page,a total of 8). It is importantthat you write
your nameon eachp
PHYSICS 3I W 2OII
The figure showsthreeblocksattached y cordsthat loop over
pulleys. Block B lies on a frictionless able. The
masses ra fl1:6.00k g, m a: 8 .00k g, a ndz 6'= 1 0.0 g.
54. (a) The compression of the spring is d = 0.12 m. The work done by the force of
gravity (acting on the block) is, by Eq. 7-12,
W1 = mgd = (0.25 kg) 9.8 m / s2 (0.12 m) = 0.29 J.
(b) The work done by the spring is, by Eq. 7-26,
W2 = kd 2 = (250