vector/scalar, displacement, distance, avg. speed, velocity & PT Graphs

Question 1

distance

Answer 1

so fundamental, it’s diff 2 define w/out reference to distance, length, etc. the total length of the path traveled by an object

Question 2

time

Answer 2

also extremely fundamental. elapsed time is the duration b/w 2 events.

Question 3

instantaneous speed

Answer 3

speed at a given point in time. the distance traveled by the time it took 2 travel that distance. s = d/t.

Question 4

average speed

Answer 4

total distance traveled divided by total time it took to travel that distance; the constant speed needed 2 cover the distance of the trip in the time of the trip

Question 5

motion diagram

Answer 5

a series of images of a moving object that records its position after equal time intervals

Question 6

particle model

Answer 6

replaces an obj by a single point. size of the obj must be much less than the distance it moves & ignore internal motions like waving of the arms.

Question 7

origin

Answer 7

the point at which the variables have the value zero

Question 8

position vector

Answer 8

locates the position of the object. length of position vector = proportional 2 the dist from the origin 2 the location of the moving obj @ a particular time.

Question 9

scalar quantity

Answer 9

a quantity that tells you only the magnitude of something. mass, time, temperature, distance, speed

Question 10

vector quantity

Answer 10

tells not only the magnitude of something, but also its direction. velocity, acceleration, position, force.

Question 11

displacement vector

Answer 11

drawn from the position of the moving object @ an earlier time 2 its position @ a later time.

Question 12

time interval

Answer 12

>T = T1 - T0

Question 13

average velocity

Answer 13

V = >d/>t. increases whn d incrses & t dcrses. on a PT graph, same as slope.

Question 14

instantaneous velocity

Answer 14

the speed and direction of an obj @ a particular instant in time

Question 15

displacement

Answer 15

>x = d1 - d0. a change in position. d is always greater than or equal to the |>x|

Question 16

average acceleration

Answer 16

an object in motion whose velocity is changing is said to be accelerating. a = >v/>t

Question 17

position

Answer 17

d = d0 + vt. location in space relative 2 a reference pt; includes distance & direction.

Question 18

mechanics

Answer 18

branch of physics concerned w/ motion

Question 19

kinematics

Answer 19

branch of mechanics that describes motion w/out considering the causes of motion.

Question 20

motion

Answer 20

a change in location/position of an obj over time.

Question 21

velocity & acceleration relationship

Answer 21

v a + + - - increase speed + - - + decrease speed

Question 22

direction of motion & no motion (“at rest”) on VT graph

Answer 22

Question 23

wat regions indicate “slow” and what regions indicate “fast” on a VT graph

Answer 23

Question 24

constant acceleration in pos. & neg. directions in VT graphs

Answer 24

Question 25

constant deceleration in pos & neg directions on VT graph

Answer 25