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8th Grade Physical Science Review Semester 2 Flashcards | StudBud
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8th Grade Physical Science Review Semester 2
8th Grade Physical Science Review Semester 2
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review for upcoming standardized test #physicalscience #matter #force #motion
Flashcards
26 cards
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Questions
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Answers
1
A car battery stores 12V of energy. If 9V is converted to electricity, what is the efficiency?
25%
0.25%
0.75%
75%
2
What is a wave?
a disturbance that transfers energy
any type of energy that makes particles move
a disturbance that transfers matter
any type of matter that vibrates back and forth
3
Which of these statements correctly describes the law of conservation of energy?
The amount of Kinetic Energy is a constant value
Energy cannot be created nor destroyed, but can change forms
Objects can only have potential or kinetic energy, not both
The energy destroyed when objects stop is equal to the mass
4
A lamp has an electrical input of 120 watts. If 80 becomes light, how much is turned to heat?
exactly 40 watts
exactly 80 watts
more than 40 watts
less than 40 watts
5
How is temperature related to heat?
Temperature and heat are the same thing
Heat causes a change in the temperature of an object
Raising the temperature causes the heat to increase
Temperature is a measure of heat
6
What type of energy is stored in batteries?
elastic
kinetic
thermal
chemical
7
As an ice cube melts into a liquid, what property of the water remains unchanged?
mass
density
temperature
volume
8
How does fiberglass insulation keep your home warm in the winter?
The air trapped in the fiberglass is an insulator
The fiberglass absorbs energy
The fiberglass generates heat
The fiberglass is an insulator
9
Why do you weigh less on the moon than on Earth?
the moon has less mass than Earth
the moon is more dense than Earth
the moon is closer to the sun
the moon has a smaller radius
10
What is heat?
Average kinetic energy of the particles in a substance
Change in the temperature in degrees Celsius
Energy transferred between two objects
Total thermal energy of a substance
11
What is true of an object that is in free fall?
only gravity acts on the object
the forces of air resistance and gravity are balanced
no forces act on the object
the forces of thrust and gravity are balanced
12
Which property of matter does not change regardless of how big a sample you have?
reactivity with oxygen
flammability
density
volume
13
Through which of these media do sound waves travel most slowly?
iron
wood
water
cold air
14
Erin warms hot chocolate in the microwave. What happens as the temperature increases?
The particles move farther apart
The particles are arranged in a pattern
The particles move slower
The particles have less energy
15
Which type of electromagnetic wave has the highest energy?
radio waves
infrared waves
visible light waves
microwaves
16
Why does a red shirt appear red to your eyes?
it reflects all colors in white light
it absorbs all colors in white light
it absorbs every color except red
it reflects every color except red
17
What is a unit of force in the metric system?
kilogram
pound
newton
joule
18
Which form of electromagnetic energy has the shortest wavelength?
radio waves
gamma rays
ultraviolet waves
infrared waves
19
What must two objects have for gravity to exist between them?
mass
volume
solidness
roundness
20
In the picture below, what part of a wave is represented by B?
trough
crest
wavelength
amplitude
21
What do microwaves transfer between a cell phone and a cell phone tower?
energy
sound
electricity
air particles
22
The image below shows a wave. What type of wave is it?
medium
longitudinal
transverse
electromagnetic
23
Which material is translucent?
pure air
construction paper
frosted glass
clear plastic
24
The picture below shows measurements made as a wave passed. What is the frequency of the wave?
2 Hz
0.5 Hz
5 seconds
2 seconds
25
The sidewalk is heated on a hot day. How do the sidewalk particles change?
They move freely from place to place
Their kinetic energy decreases
They move closer together
They move faster
26
What are you measuring when you take the temperature of something?
average potential energy
potential energy
kinetic energy
average kinetic energy
