{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Physics 101 Lecture 2

# Physics 101 Lecture 2 - Chapter 2 Motion in One Dimension...

This preview shows pages 1–14. Sign up to view the full content.

Chapter 2 Motion in One Dimension Dr. Armen Kocharian

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Dynamics ± The branch of physics involving the motion of an object and the relationship between that motion and other physics concepts ± Kinematics is a part of dynamics ± In kinematics, you are interested in the description of motion ± Not concerned with the cause of the motion
Quantities in Motion ± Any motion involves three concepts ± Displacement ± Velocity ± Acceleration ± These concepts can be used to study objects in motion

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Brief History of Motion ± Sumaria and Egypt ± Mainly motion of heavenly bodies ± Greeks ± Also to understand the motion of heavenly bodies ± Systematic and detailed studies ± Geocentric model
“Modern” Ideas of Motion ± Copernicus ± Developed the heliocentric system ± Galileo ± Made astronomical observations with a telescope ± Experimental evidence for description of motion ± Quantitative study of motion

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Position ± Defined in terms of a frame of reference ± One dimensional, so generally the x- or y-axis ± Defines a starting point for the motion
Displacement ± Defined as the change in position ± ± f stands for final and i stands for initial ± May be represented as Δ y if vertical ± Units are meters (m) in SI, centimeters (cm) in cgs or feet (ft) in US Customary fi xx x Δ≡

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Displacements
Vector and Scalar Quantities ± Vector quantities need both magnitude (size) and direction to completely describe them ± Generally denoted by boldfaced type and an arrow over the letter ± + or – sign is sufficient for this chapter ± Scalar quantities are completely described by magnitude only

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Displacement Isn’t Distance ± The displacement of an object is not the same as the distance it travels ± Example: Throw a ball straight up and then catch it at the same point you released it ± The distance is twice the height ± The displacement is zero
Speed ± The average speed of an object is defined as the total distance traveled divided by the total time elapsed ± Speed is a scalar quantity = = total distance Average speed total time d v t

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Speed, cont ± Average speed totally ignores any variations in the object’s actual motion during the trip ± The total distance and the total time are all that is important ± SI units are m/s
Velocity ±

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 46

Physics 101 Lecture 2 - Chapter 2 Motion in One Dimension...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online