The position of vector r of a point P in space is the vector from the origin to P
Its components are the coordinates x,y,and z
-The average velocity vector during the time interval is the displacement divided by delta t,time
-The instantaneous velocity ve
The momentum p of a particle is a vector quantity equal to the product of the particles mass and
velocity
The net force on a particle is equal to the rate of change of the particles momentum
If a constant net force acts on a particle for a time interval,
When a force acts on a body, the torque of that force with respect to a point has a magnitude
given by the product of the force magnitude F and the lever arm l.
Torque is a vector equal to the vector product of r and F
The rotational analog of Newtons sec
When a body is in equilibrium in an inertial frame of reference, either at rest or moving at
constant velocity, the vector sum of forces acting on it must be zero.
- We use free body diagrams in identifying forces that act on the body
- Newtons third law
When a constant force acts on a partial that undergoes a straight line, the work done by thefoce
on the particle is dined to be the scalar product of F and s
- The work is also equal to F times s times cosine of the angle
- The unit of work is 1 joule
- W
Three fundamental physical quantities are
- Mass
- Length
- Time
The corresponding basic SI Units are
- Kilogram
- Meter
- Seconds
Derived units for other physical quantities are
- Products
- Quotients of the basic units
Equations must be dimensionally co
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Agenda:
Begin Ch 1 - Measurement Systems, Units, Vectors and Scales
HW Assignment : Reading from text
Hw for 2/2: read chap 1, pg 27 # 1,3,5,7; read chapter 2, sections 2.1 and 2.2
Notes:
Measurements
1. System of units
a. British System - Based on human