Physics Ch 3

Question 0

Independence of motion

Answer 0

horizontal and vertical components of 2D motion are independent of each other

Question 1

Vector

Answer 1

quantities with both magnitude and direction

Question 2

Head to tail method

Answer 2

graphical way to add vectors

Question 3

tail

Answer 3

starting point of the vector

Question 4

head (tip)

Answer 4

final, pointed end of the arrow

Question 5

Resultant vector

Answer 5

vector sum of 2+ vectors

Question 7

magnitude of the resultant

Answer 7

length as measured by a ruler

Question 8

Direction of the resultant

Answer 8

measure the angle it makes with the reference frame using a protractor

Question 9

Commutative

Answer 9

characteristic of vector addition in that vectors can be added in any order and you’d still get the same result

Question 10

Multiply vector by positive scalar

Answer 10

magnitude changes, direction stays the same

Question 11

Multiply vector by negative scalar

Answer 11

magnitude changes, new vector in opposite direction

Question 12

Component

Answer 12

piece of a vector that points in either the vertical or the horizontal direction; every 2-d vector can be expressed as a sum of 2 vertical and horizontal vector ______(s)

Question 13

Analytical methods

Answer 13

vector addition and subtraction employs geometry and simple trigonometry rather than the ruler and protractor of graphical methods

Question 14

Projectile motion

Answer 14

motion of an object thrown or projected into the air, subject to only the acceleration of gravity

Question 15

Projectile

Answer 15

object that is thrown

Question 16

Trajectory

Answer 16

path a thrown object travels

Question 17

Air resistance

Answer 17

in two-dimensional projectile motion, this is negligible

Question 18

Range

Answer 18

horizontal distance R traveled by a projectile

Question 19

Velocity

Answer 19

object has this relative to a medium; medium has this relative to an observer on solid ground

Question 20

Relative velocities

Answer 20

velocity relative to some reference frame

Question 21

Relativity

Answer 21

study of how different observers moving relative to each other measure the same phenomenon

Question 22

Classical relativity

Answer 22

limited to situations where speeds are less than about 1% of the speed of light (less than 3000 km/s)