2.1 displacement D2002 Brooks Cole Publishing-a division of Thomson Learning Position Defined in terms of a frame of reference One dimensional so generally the X- or y-axis Defines a starting ol point for the motion
2.1 displacement Position ◼ Defined in terms of a frame of reference ◼ One dimensional, so generally the xor y-axis ◼ Defines a starting point for the motion
Displacement Defined as the change in position △X≡X-X f stands for final and i stands for initial May be represented as ay if vertical Units are meters(m) in SI centimeters (cm)in cgs or feet (ft)in US Customary
Displacement ◼ Defined as the change in position ◼ ◼ f stands for final and i stands for initial ◼ May be represented as y if vertical ◼ Units are meters (m) in SI, centimeters (cm) in cgs or feet (ft) in US Customary f i − x x x
Displacements -40 10 x(m) 50 10 0 (m) e2008 Bracks cole. Thomson
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 t or- sign is sufficient for this chapter Scalar quantities are completely described by magnitude only
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
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
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