Periodic Motion and Wave (5/13)

Question 1

Amplitude

Answer 1

Extent of displacement

Question 2

Factors of periodic motion

Answer 2

Amplitude
repeating cycle (period=T)
Frequency (1/T) or Hz

Question 3

Cycle of periodic motion

Answer 3

Inertia: an object in motion tends to stay in motion

Restoring force: brings the object back to its equilibrium point (gravity)

Question 4

At the midpoint

Answer 4

KE is max

PE is zero

Question 5

At the extreme point where motion stops for fraction of a second

Answer 5

KE= 0
PE= max

Question 6

Hooke’s law

Answer 6

F=-k*x

PE=1/2k*x^2

Question 7

Pendulum period equation

Answer 7

T=2pisqrtL/g

Question 8

Springs period equation

Answer 8

T=2pisqrtm/k

more mass=longer period

Question 9

Mechanical waves

Answer 9

Physical pieces of mass that move back and fourth

Question 10

Electromagnetic waves

Answer 10

oscillating electromagnetic fields

Question 11

Transverse mechanical waves

Answer 11

Move up and down along y-axis. Only move on the vertical

Particles oscillate perpendicular to the direction of wave movement

Question 12

Longitudinal waves

Answer 12

Particles oscillate parallel to the direction of wave movement
EX) sound

Question 13

Ways to represent longitudinal waves

Answer 13

Compression and rarefaction (being bunched up then separated)

Sinusoidal
Amplitude= level of compression

Question 14

Interference

Answer 14

When waves interact and create a wave with the sum of amplitudes

Question 15

Constructive interference

Answer 15

Line up an amplitude increases

Question 16

Destructive interference

Answer 16

Amplitude is smaller than largest amplitude or is zero when they perfectly are every other

Question 17

Standing wave

Answer 17

Many waves overlapping and interfering with each other in a consistent manner

Question 18

Points of no displacement

Answer 18

nodes

Question 19

Points of maximum displacement

Answer 19

antinodes

Question 20

Resonance frequency

Answer 20

object’s natural vibration frequency enabling maximum amplitude

Question 21

Harmonics

Answer 21

One antinode- fundamental, wavelength= 2L
two antinodes- wavelength=L/1
three antinodes- wavelength=2/3L
Overall, wavelength=2L/N

Question 22

Pipes

Answer 22

String at both ends: nth harmonic has n antinodes

open: nth harmonic has n nodes

Question 23

Closed pip (closed at one end)

Answer 23

closed end has node and open end has antinode
Wavelength=4L
Overall, wavelength= 4L/n
n is a odd number