Which option is the force with the greatest magnitude?
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1 point
The force needed to lift a pencil
The force needed to lift a hairbrush
The force needed to lift a chair
The force needed to lift a chair.
Yes, this is an example of a force because a force is a push or pull. The person is applying a force on the box, even though it is not moving.
A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?
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1 point
No, this is not an example of a force because the box did not move.
Yes, this is an example of a force because a force is a push or pull.
No, this is not an example of a force because a force pulls an object.
When you trip, your foot stops, but your body continues to move forward. Which statement best explains why this happens?
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1 point
The unbalanced force that stops your foot pulls your body forward.
An unbalanced force pushes your body forward.
An unbalanced force stops your foot but does not act on the rest of your body.
An unbalanced force stops your foot but does not act on the rest of your body.
Which is a good description of kinetic energy?
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1 point
Conserved energy
Energy of motion
Stored energy
Energy of motion.
A person throws a ball up into the air. At which point in its path will the ball have the greatest potential energy?
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1 point
When the ball is still rising
When the ball reaches its highest point
When the ball leaves the person’s hand
When the ball hits the ground
When the ball reaches its highest point.
This image of a roller coaster is designed to show important information about potential and kinetic energy. One of these pieces of information is incorrect. Which information is wrong, and why?
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1 point
The roller coaster would only have kinetic energy at the point labeled “gravitational potential energy and kinetic energy.”
The spot with the “maximum kinetic energy” should be on the lowest point of the roller coaster, at the far left side on the bottom.
The roller coaster would only have potential energy at the point labeled “gravitational potential energy and kinetic energy.”
The spot with the “maximum kinetic energy” should be on the lowest point of the roller coaster, at the far left side on the bottom. This is because kinetic energy is greatest when the velocity of the object is highest and speed is greatest at the lowest point in the roller coaster. So, the point with the maximum kinetic energy should be at the bottom of the roller coaster, not at point B where it starts to climb.
Which statement explains how the charges on objects determine the electric force between them?
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1 point
Objects with positive charges attract each other, and objects with negative charges repel each other.
Objects with the same charge attract each other, and objects with opposite charges repel each other.
Objects with positive charges repel each other, and objects with negative charges attract each other.
Objects with the same charge repel each other, and objects with opposite charges attract each other.
Objects with the same charge repel each other, and objects with opposite charges attract each other.
Why is glass a good insulator?
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1 point
The atoms in glass hold on tightly to their negatively charged particles.
The atoms in glass hold on tightly to their positively charged particles.
The atoms in glass do not hold on tightly to their negatively charged particles.
The atoms in glass hold on tightly to their negatively charged particles.
Which purpose does a light bulb serve in a circuit?
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1 point
Cell
Switch
Load
Load.
Of these things in an environment, which one is a living thing?
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1 point
air
river flowing down a mountain
mushrooms sprouting
clay on the side of the riverbank
Mushrooms sprouting.
One reason animal cells don't need a central vacuole is because they often have smaller vacuoles for storage. What is another reason animal cells don't need central vacuoles?
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1 point
Animals do not produce their own food.
Animal cells have cell walls.
Animal bodies have skeletons or other means of providing structure.
Animal bodies have skeletons or other means of providing structure.
What is the function of a nerve cell in a multicellular organism?
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1 point
produce and manage movement
store and distribute oxygen
carry and transmit signals
Carry and transmit signals.
Which system is most complex?
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1 point
cells
organs
organ systems
Which statement is true?
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1 point
Bones help the heart pump blood.
Bones are composed of a single layer.
Bones provide shape to the body.
Bones are organ systems.
Which example shows an organism that cannot reach homeostasis through internal changes?
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1 point
A lizard is cold, and it moves to a sunny rock to warm up.
A dog shivers when it is too cold.
A person gets a fever in response to a flu infection.
In which two organs is food broken down?
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1 point
Mouth and stomach
Small intestine and large intestine
Esophagus and small intestine
Esophagus and stomach
When you experience changes in light, sound, and temperature, which cells send signals toward the central nervous system?
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1 point
dendrites
sensory neurons
axons
Organ systems are most complex.
Bones provide shape to the body.
A person gets a fever in response to a flu infection.
Food is broken down in the mouth and stomach.
Sensory neurons.
Bacteria and humans are similar in that they
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1 point
are multicellular.
produce energy.
are unicellular.
grow and reproduce.
Why is the classification species not considered a group?
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1 point
Each species is an individual organism.
Each species is a separate type of organism.
Each species shares characteristics with other species.
Use this chart to answer the question below.
Use the table model to correctly identify the animal in the story. You are walking home from school and an animal jumps out on the sidewalk. You can see it has a backbone, fur and is nibbling on some grass. As you get closer, you see that the animal is a....
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1 point
bird
cat
rabbit
dog
Why are scientific names important to use?
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1 point
It is easier to pronounce than the common name.
That name is the same everywhere in the world.
The name is for animals that are only found in a specific location.
What should be the correct order (largest to smallest) of hierarchy for Classification of Organisms?
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1 point
class → order → family → genus → species
order → class → family → genus → species
species → genus → order → family → class
Grow and reproduce.
Each species is an individual organism.
Rabbit.
Scientific names are the same everywhere in the world.
Class → order → family → genus → species.