Unit 4 Test- Ms.Cicco

Question 1

define wave

Answer 1

spreading a disturbance from one place to another

Question 2

what do waves carry?

Answer 2

energy

Question 3

define crest

Answer 3

point of maximum displacement on a wave

Question 4

define trough

Answer 4

points on minimum displacement on a wave

Question 5

define amplitude

Answer 5

the distance between crest or trough

Question 6

define frequency

Answer 6

the number of waves that are produced in a certain amount of time

Question 7

define wavelength

Answer 7

the distance between 2 waves

Question 8

how does frequency change the sound we hear?

Answer 8

Higher frequency= louder sounds

Lower frequency=softer sound

Question 9

How does amplitude change the sound we hear?

Answer 9

higher amplitude=higher sounds

lower amplitude= softer sound

Question 10

what causes an echo?

Answer 10

reflection of sound waves on hard surface or soft surafce

Question 11

what media do sound waves move the fastest through?

Answer 11

Solid/hot substances because molecules ina solid are tightly compacted

Question 12

On a hot day would it be best to wear a black or white t-shirt?

Answer 12

White because white bounces off all color waves and black absorbs color waves

Question 13

what is the difference between electromagnetic waves and mechanical waves?

Answer 13

electromagnetic waves are transverse or longitudinal and travel out from the source

Question 14

What is the Doppler Effect?

Answer 14

an increase or decrease of pitch determined by waves

Question 15

How is the electromagnetic scale organized

Answer 15

Frequency

Question 16

What part of the EMS spectrum can humans see?

Answer 16

Visible light/color

Question 17

What are the colors of the visible light spectrum highest to lowest frequency?

Answer 17

Red Orange Yellow Green Blue Indigo Violet (ROY G. BIV)

Question 18

The definition of Reflection, a sound example, and light example

Answer 18

Definition: Light wave bounces back after striking a barrier
Sound Example: Echo
Light Example: Mirror

Question 19

The definition of Refraction, a sound example and light example

Answer 19

Definition: The bending of a wave as it pushes from one medium to another
Sound Example: Talking underwater
Light Example: Pencil in glass of water

Question 20

The definition of Absorption, a sound example and light example

Answer 20

Definition: Opposite of reflection
Sound Example: Soft surfaces
Light Example: Color black

Question 21

The definition of Diffraction, a sound example, and a light example

Answer 21

Definition: interference through a narrow opening

Question 22

What causes a wave to refract?

Answer 22

Wave traveling from one medium to another

Question 23

Why does an apple appear red?

Answer 23

All other colors are being absorbed while red is being reflected

Question 24

What causes sound?

Answer 24

Vibrations

Question 25

Which wave has a higher frequency? Short wavelength or long wavelength

Answer 25

short wavelength

Question 26

What is the relationship between wavelength and frequency?

Answer 26

Shorter the wavelength, higher the frequency

Question 27

define mass

Answer 27

a coherent, typically large body of matter with no definite shape

Question 28

What is the difference between mass and weight?

Answer 28

weight can change mass will not

Question 29

if you went to Jupiter, what would change about your mass and weight?

Answer 29

weight would change but not mass

Question 30

two round obejcts are dropped rom a building at the same time (with air resistance) Which will land first? why?

Answer 30

The one with more mass because it has more gravitational pull

Question 31

What to factors affect the force of gravity?

Answer 31

Mass and Distance

Question 32

Why is there less gravity on the moon then there is on earth?

Answer 32

Moon has less mass

Question 33

What is newton’s 1st law of motion?

Answer 33

an object at rest stays at rest an object in motion stays in motion unless acted upon an outside force

Question 34

Define inertia

Answer 34

an object that refuses change

Question 35

If I apply equal force to a small car and a large truck, which one will have the GREATEST change in motions? Why?

Answer 35

Small car because it has less mass and greater acceleration

Question 36

define friction

Answer 36

a force that acts against motion

Question 37

what’s the difference between speed and velocity?

Answer 37

speed is how fast something is going; velocity is speed in different directions

Question 38

What is newton’s 2nd law of motion?

Answer 38

F=MxA

Question 39

If equal force is applied to an elephant and a baby duck which will have the greatest change in motion? Why?

Answer 39

Baby duck because it has less mass

Question 40

What is newton’s 3rd law of motion?

Answer 40

for every action there is an equal and opposite reaction

Question 41

a fly strikes the windshield of a bus. Which of the 2 forces is greater: the force of the fly or the force of the bus?

Answer 41

Law 3; equal forces

Question 42

A dog I walking at a constant speed of 4 m/s. how far will the dog travel in twenty minutes?

Answer 42

80 km

Formula: s= distance/time

Question 43

What odes it mean for forces to be balanced? Unbalanced?

Answer 43

balanced: two equal forces acting upon opposite directions( not moving)
unbalanced: have unequal forced causing an object to move

Question 44

What are the three signs an object is accelerating?

Answer 44

1. speeding up
2. slowing down
3. changing direction

Question 45

define frame/point of reference

Answer 45

frame: appears to move

point of reference: doesn’t appear moving