hey bot What does a horizontal line on a position-time graph indicate about the object?
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The object is accelerating.
The object has a position of zero.
The object remains still.
The object remains still.
hey bot 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.
hey bot 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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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.
Yes, this is an example of a force because a force is a push or pull.
hey bot 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.
hey bot Which is a good description of kinetic energy?
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1 point
Conserved energy
Energy of motion
Stored energy
Energy of motion.
hey bot 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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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.
hey bot 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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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 roller coaster would only have kinetic energy at the point labeled “gravitational potential energy and kinetic energy.” This information is incorrect because at other points (like the lowest point), the roller coaster will also have kinetic energy.
hey bot Two students drop an object into sand from a height of 1.5 meters. They record the depth of the hole made in the sand by each student’s object. What is the most likely explanation for the results?
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Maddie’s object has a smaller width.
Naveed’s object has less mass.
Naveed’s object had greater kinetic energy.
Naveed’s object had greater kinetic energy.
hey bot A student wants to determine the effect of mass on kinetic energy. She will drop two balls of the same size into a pool of water. Which investigation method should the student use?
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1 point
She should drop two balls with different masses from different heights.
She should drop two balls with different masses from the same height.
She should drop two balls of the same mass from different heights.
She should drop two balls of the same size from the same height.
hey bot 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.
hey bot 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.