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Lecture 3

# PHYS1041 Notes Week 3

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Department
Physics
Course Code
PHYS 1041
Professor
Dr.David Fleming

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Physics 1041 Notes
January 20th
Forces
scalar quantity: possesses only magnitude (ex. temperature, mass)
vector quantity: possesses both magnitude and direction (ex. velocity, force)
F= force
m= mass
g= force of gravity, equal to 9.81m/s2
are related by the equation
mgF
=
Vectors
A vector r can be broken into its horizontal distance, rx and its vertical distance, ry.
Trigonometry can be used to solve for these components.
Unit Vectors
have a magnitude of 1 with no units
along the x-axis: i
along the y-axis: j
along the z-axis: k
Forces (cont'd)
Force is a vector quantity.
Normal Force (Fn) works at a right angle to surfaces in contact with an object
possessing gravitational force (Fg)
When two forces are equal and opposite, we say they are in equilibrium and there
is no motion
ngnet
FFF
+=
maF
net
=
(Newton's 2nd Law)
Frictional Force
μ represents the coefficient of frictional force
static frictional force applies when object is immobile
nstaticfstatic
FF
µ
=
kinetic frictional force applies when object is in motion
nkineticfkinetic
FF
µ
=
gravitational force, normal force, frictional force and applied force can all act on a
free body

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Description
Physics 1041 Notes January 20th Forces • scalar quantity: possesses only magnitude (ex. temperature, mass) • vector quantity: possesses both magnitude and direction (ex. velocity, force) F= force m= mass 2 g= force of gravity, equal to 9.81m/s are related by the equation F = mg Vectors A vector r can be broken into its horizontal distance, r axd its vertical distance, r .y Trigonometry can be used to solve for these components. Unit Vectors • have a magnitude of 1 with no units • along the x-axis: i • along the y-axis: j • along the z-axis: k Forces (cont'd) • Force is a vector quantity. • Normal Force (F ) norks at a right angle to surfaces in contact with an object possessing gravitational force (F g • When two forces are equal and opposite, we say they are in equilibrium and there is no motion F net= F g F n F net= ma (Newton's 2nd Law) Frictional Force • μ represents the coefficient of frictional force • static frictional force applies when object is immobile F fstaticμ statin F = μ F • kinetic frictional force applies when object is in motion fkinetic kinetin • gravitational force, normal force, frictional force and applied force can all act on a free body January 22nd Vectors • tail= where vector starts • head= where vector ends • to add vectors, join the head of 1st vector to tail of 2nd vectors • the resultin
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