In Class: Today in Honors Physics, we took notes on Newton’s first and second laws of motion, watched a JSM video on Newton’s Second law and we did a corresponding worksheet to the video. Today in class I got scared because Coats-Haan called me out for not know the difference between weight and gravity and wasn’t really paying attention so I had no idea what she was talking about.
Notes:
Classical Mechanics
· Describe what happens to things as small as an atom to as big as a galaxy
· Apply in a non-accelerating reference frame(which is the definition of an inertial reference frame)
Force
· Push or pull
· Something that causes an object to accelerate
· 4 types of forces: gravitational, electromagnetic, strong nuclear, and weak nuclear
Newton’s 1st law
· If no forces act on an object, it will have zero acceleration
Inertia
· The tendency of a body to maintain its state of rest or uniform motion
· The first law is sometimes known as the law of inertia.
Mass
· Is a measure of the inertia of an object
· Is not the same thing as weight
· Can only be defined in terms of how we measure it.
· Is an additive scalar property
Mass Units
· SI: kilograms
· cgs: grams
· English: slugs
· Pounds are a unit of weight, not a unit of mass
Newton’s 2nd law
· ΣF=ma
· a= acceleration (vector)
· m= mass
· ΣF= vector sum of all the forces acting on the body
Units
· ΣF=ma
· SI units: Newton= Kg x m/s2
· cgs units: dyne= gram x cm/s2
· English units: pound= slug x ft/s2
Papers Back: Inertia ball, JSM Inertia: Newton’s First Law, Diagnostic Test
Assignments: Newton’s 2nd law on pages 73-74 in the lab manual and page 127 #1-9 in the textbook
Turned in: page 63 (take home lab) and pages 71-72 from our lab manual
QOD: How are mass and weight different?
Mass is the amount of matter an object has and is a measure of the inertia of an object, while weight is the measure of the force of an object when exposed to a gravitational force.
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