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Duplicate of 8th Grade Physical Science Review Flashcards | StudBud
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Duplicate of 8th Grade Physical Science Review
Duplicate of 8th Grade Physical Science Review
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review for upcoming standardized test #physicalscience #matter #force #motion
Flashcards
19 cards
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Questions
19
Answers
1
A car battery stores 12V of energy. If 9V is converted to electricity, what is the efficiency?
0.75%
0.25%
25%
75%
2
What are you measuring when you take the temperature of something?
average kinetic energy
kinetic energy
average potential energy
potential energy
3
Which unit is used to measure distance?
centimeters
grams
seconds
milliliters
4
Which represents the greatest acceleration?
200 m/s
0.002km/s2
200cm/s2
0.020km/s2
5
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
The energy destroyed when objects stop is equal to the mass
Objects can only have potential or kinetic energy, not both
6
What type of energy is stored in batteries?
chemical
elastic
thermal
kinetic
7
The sidewalk is heated on a hot day. How do the sidewalk particles change?
They move faster
They move closer together
Their kinetic energy decreases
They move freely from place to place
8
What is true of an object that is in free fall?
no forces act on the object
only gravity acts on the object
the forces of air resistance and gravity are balanced
the forces of thrust and gravity are balanced
9
A lamp has an electrical input of 120 watts. If 80 becomes light, how much is turned to heat?
more than 40 watts
exactly 80 watts
less than 40 watts
exactly 40 watts
10
A car drives straight for 45 miles during 1 hour. What else do you need to figure velocity?
how many times the car stopped
how long the car stopped for
the total distance the car traveled
The direction the car traveled
11
What is heat?
Average kinetic energy of the particles in a substance
Total thermal energy of a substance
Energy transferred between two objects
Change in the temperature in degrees Celsius
12
What is the evidence that an unbalanced force is acting on an object?
The object has constant velocity.
The object remains at rest.
The mass of the object changes.
The motion of the object is changing.
13
Erin warms hot chocolate in the microwave. What happens as the temperature increases?
The particles are arranged in a pattern
The particles have less energy
The particles move farther apart
The particles move slower
14
A solid rock is sitting on the ground. What best describes the particles inside the rock?
vibrating, but not changing place
constantly sliding over each other
not moving at all
always moving from place to place
15
How is temperature related to heat?
Raising the temperature causes the heat to increase
Temperature and heat are the same thing
Temperature is a measure of heat
Heat causes a change in the temperature of an object
16
Why do you weigh less on the moon than on Earth?
the moon is closer to the sun
the moon has less mass than Earth
the moon is more dense than Earth
the moon has a smaller radius
17
What must two objects have for gravity to exist between them?
mass
roundness
solidness
volume
18
What is a unit of force in the metric system?
joule
pound
newton
kilogram
19
The data below is for a moving car. What is the average speed of the car?
20 m/s
40 m/s
120 m/s
60 m/s
