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Forces Of Motion And Waves
Test Description: South Carolina Standards 8th Grade 8P2 8P3
Instructions: Answer all questions to get your test result.
1) What is the difference between a low frequency and a high frequency wave?
A
Amplitude decreases in high frequency waves
B
Amplitude increases in high frequency waves
C
Wavelength decreases in high frequency waves
D
Wavelength increases in high frequency waves
2) Which of the following best explains why a fresh banana appears yellow?
A
the banana emits all colors and our eyes absorb the yellow wavelength
B
the banana reflects the yellow wavelength and absorbs all the other colors
C
the banana emits yellow light and our eyes absorb all other color wavelengths
D
the banana absorbs the yellow wavelength and reflects all the other colors
3) Which electromagnetic wave has the lowest frequency but the largest wavelengths?
A
Microwaves
B
Radio Waves
C
Gamma Rays
D
Visible Light
4) How does a prism reveal all the colors that make up white light?
A
the prism absorbs colors of white light as it passes through
B
the prism acts as a lens to reflect white light
C
the prism adds colors to white light as it transmits through
D
the prism refracts different wavelengths of light
5) Which of the following explains why we can see and feel energy from the Sun?
A
electromagnetic waves cannot travel through solids
B
electromagnetic waves transfer matter
C
electromagnetic waves vibrate through a medium
D
electromagnetic waves can travel through empty space
6) Which of the following best explains an echo?
A
sound waves are reflected off objects
B
sound waves are absorbed by objects
C
sound waves are transmitted through objects
D
Sound waves are refracted off objects
7) Which of the following electromagnetic waves is best for wireless technology and communication?
A
X-rays because they have a high energy and a high frequency
B
Visible light because it is visible to the human eye
C
Gamma waves because it has high energy and shorter wavelengths
D
Radio waves because it has a lower energy and longer wavelengths
8) What is the function of a convex lens?
A
to separate white light
B
to refract light and magnify objects
C
to filter and transmit light
D
to reflect light so objects will be more visible
9) Which of the following correctly explains a sound wave.
A
Mechanical Waves that travel as compressional waves parallel to the direction of motion
B
Electromagnetic Waves that travel as transverse waves perpendicular to the direction of motion
C
Mechanical Waves that travel as transverse waves perpendicular to the direction of motion
D
Electromagnetic Waves that travel as compressional waves parallel to the direction of motion
10) What would happen if you have two crests of a wave traveling toward one another?
A
Destructive Interference and the waves amplitude would decrease
B
Destructive Interference and the waves amplitude would increase
C
Constructive Interference and the waves amplitude would increase
D
Constructive Interference and the waves amplitude would decrease
11) If a car is traveling forward with a force of 100N and the force of friction is acting in the opposite direction at 20N. What is the net force acting on the car and the direction?
A
120 Newtons forward
B
80 Newtons forward
C
100 Newtons backwards
D
d) 20 Newtons backwards
12) If a car travels 100 meters in 5 seconds, what is the average speed of the car?
A
50 m/s
B
20 m/s
C
500 m/s
D
100 m/s
13) Which of the following BEST explains why a heavier object is harder to move?
A
the less mass an object has the more inertia
B
heavier object require more force because they have less inertia
C
The more mass an object has the more inertia
D
The more mass an object has the less inertia
14) Which of the following forces can speed up, change directions, or slow down the speed of an object?
A
Air Resitance
B
All of the answer choices
C
Friction
D
Gravity
15) On a time-distance graph when a line is straight and not curved which of the following is true?
A
The object traveled at a constant speed
B
The object increased in speed
C
The object was traveled back to the reference point
D
The object decreased in speed
16) Which of the following BEST describes how to speed up the motion of an object?
A
Apply a force in the opposite direction as the object is moving
B
Increase the objects mass
C
Increase the amount of friction
D
Apply a force in the same direction as the object is moving
17) Which of the following best explains why a person continues to move forward during a car crash?
A
Gravity
B
Inertia
C
Action and Reaction
D
Friction
18) A rocket launch causes a action force of 500N, what would the reaction force of the gases be?
A
Equal to 500 N
B
Less than 500N
C
Greater than 500N
D
There is no way to know
19) What does a negative slope on a time distance graph represent?
A
An object that is going back towards its reference point
B
An object that is at rest
C
An object moving away from its reference point
D
An object that is changing speed
20) Which of the following would be the best controlled scientific investigation to determine how the amount of force on an object affects its speed?
A
Push an object of the same mass with different amounts of force at least three times and measure its average speed.
B
Push various objects with different amounts of force and measure there average speed.
C
Push an object with the same force with different amounts of mass and calculate its average speed.
D
Push various objects with different masses at least three times and measure its average speed.
*select an answer for all questions
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