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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 increases in high frequency waves
B
Wavelength increases in high frequency waves
C
Amplitude decreases in high frequency waves
D
Wavelength decreases 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 emits yellow light and our eyes absorb all other color wavelengths
C
the banana reflects the yellow wavelength and absorbs all the other colors
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
Radio Waves
B
Visible Light
C
Gamma Rays
D
Microwaves
4) How does a prism reveal all the colors that make up white light?
A
the prism adds colors to white light as it transmits through
B
the prism acts as a lens to reflect white light
C
the prism refracts different wavelengths of light
D
the prism absorbs colors of white light as it passes through
5) Which of the following explains why we can see and feel energy from the Sun?
A
electromagnetic waves can travel through empty space
B
electromagnetic waves cannot travel through solids
C
electromagnetic waves vibrate through a medium
D
electromagnetic waves transfer matter
6) Which of the following best explains an echo?
A
sound waves are absorbed by objects
B
Sound waves are refracted off objects
C
sound waves are transmitted through objects
D
sound waves are reflected off objects
7) Which of the following electromagnetic waves is best for wireless technology and communication?
A
Gamma waves because it has high energy and shorter wavelengths
B
X-rays because they have a high energy and a high frequency
C
Visible light because it is visible to the human eye
D
Radio waves because it has a lower energy and longer wavelengths
8) What is the function of a convex lens?
A
to refract light and magnify objects
B
to separate white light
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
Mechanical Waves that travel as transverse waves perpendicular to the direction of motion
C
Electromagnetic Waves that travel as compressional waves parallel to the direction of motion
D
Electromagnetic Waves that travel as transverse waves perpendicular to the direction of motion
10) What would happen if you have two crests of a wave traveling toward one another?
A
Constructive Interference and the waves amplitude would increase
B
Constructive Interference and the waves amplitude would decrease
C
Destructive Interference and the waves amplitude would increase
D
Destructive 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
80 Newtons forward
B
d) 20 Newtons backwards
C
100 Newtons backwards
D
120 Newtons forward
12) If a car travels 100 meters in 5 seconds, what is the average speed of the car?
A
20 m/s
B
100 m/s
C
500 m/s
D
50 m/s
13) Which of the following BEST explains why a heavier object is harder to move?
A
heavier object require more force because they have less inertia
B
The more mass an object has the more inertia
C
the less 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
Gravity
B
All of the answer choices
C
Air Resitance
D
Friction
15) On a time-distance graph when a line is straight and not curved which of the following is true?
A
The object increased in speed
B
The object was traveled back to the reference point
C
The object decreased in speed
D
The object traveled at a constant 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 amount of friction
C
Increase the objects mass
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
Inertia
B
Gravity
C
Friction
D
Action and Reaction
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
There is no way to know
D
Greater than 500N
19) What does a negative slope on a time distance graph represent?
A
An object that is changing speed
B
An object moving away from its reference point
C
An object that is at rest
D
An object that is going back towards its reference point
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 with the same force with different amounts of mass and calculate its average speed.
B
Push various objects with different amounts of force and measure there average speed.
C
Push an object of the same mass with different amounts of force at least three times and measure 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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