# ECOR 1101 Lecture Notes - Lecture 1: Significant Figures, Fluid Mechanics, Statics

Mechanics, Units, Significant Digits

January 5, 2018 7:04 PM

What is Mechanics?

• Mechanics is the study of bodies either at rest or moving subject to the action of forces.

• Includes:

○ This Course: Rigid-Body mechanics (do not change shape)

○ Deformable body mechanics (changes shape)

○ Fluid mechanics

•Statics: objects don’t move , constant velocity, a= 0

•Dynamics: objects do move, a /= 0

○Kinematics: Geometry of motion

○Kinetics: Forces causing motion

History:

• Moment of a Force: Leonardo Da Vinci

• Law for freefall, Strength of beams, Concepts of stress : Galileo Galilei

• : Isaac Newton: Laws of motion

○ A body stays at rest or in uniform motion until acted upon (inertia)

○ A change in motion is proportional to the force (F=ma)

○ For every action, there is an equal and opposite reaction

○Newton's Law of Gravity (1687):

○W = mg

• G = gravitational constant 9.8 m/s2 or 32.3 ft/s2

• Weight is in N (Force of gravity)

• Mass is in Kg

Systems and Base Units:

• Length: Position

• Time: Motion/speed

• Mass: Amount of matter

• Force: Push or pull between bodies (1N = 1 apple weight)

•International System (SI)

•U.S. Customary System (USCS)

this notebook

## Document Summary

What is mechanics: mechanics is the study of bodies either at rest or moving subject to the action of forces, includes: This course: rigid-body mechanics (do not change shape) Fluid mechanics: statics: objects don"t move , constant velocity, a= 0, dynamics: objects do move, a /= 0. History: moment of a force: leonardo da vinci, law for freefall, strength of beams, concepts of stress : galileo galilei, : isaac newton: laws of motion. A body stays at rest or in uniform motion until acted upon (inertia) A change in motion is proportional to the force (f=ma) For every action, there is an equal and opposite reaction. W = mg: g = gravitational constant 9. 8 m/s2 or 32. 3 ft/s2, weight is in n (force of gravity, mass is in kg. Systems and base units: length: position, time: motion/speed, mass: amount of matter, force: push or pull between bodies (1n = 1 apple weight, international system (si, u. s.