Factors Affecting Forces - Middle School Physical Science
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What is the direction of the electric force between two positive charges?
What is the direction of the electric force between two positive charges?
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Repulsive; they push away from each other. Like charges repel each other.
Repulsive; they push away from each other. Like charges repel each other.
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What is the direction of the electric force between a positive charge and a negative charge?
What is the direction of the electric force between a positive charge and a negative charge?
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Attractive; they pull toward each other. Opposite charges attract each other.
Attractive; they pull toward each other. Opposite charges attract each other.
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Which statement correctly compares the forces on two interacting charges (Newton’s third law)?
Which statement correctly compares the forces on two interacting charges (Newton’s third law)?
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Equal in magnitude and opposite in direction. Newton's third law applies to electric forces.
Equal in magnitude and opposite in direction. Newton's third law applies to electric forces.
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What is the interaction between two north poles of magnets placed near each other?
What is the interaction between two north poles of magnets placed near each other?
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Repulsion. Like magnetic poles repel.
Repulsion. Like magnetic poles repel.
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Which evidence best supports that force depends on distance: same objects, different separations?
Which evidence best supports that force depends on distance: same objects, different separations?
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Greater separation produces a smaller measured force. Experimental data shows inverse distance relationship.
Greater separation produces a smaller measured force. Experimental data shows inverse distance relationship.
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Which evidence best supports that electric force depends on charge magnitude at the same distance?
Which evidence best supports that electric force depends on charge magnitude at the same distance?
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A larger $|q|$ produces a larger measured force. Experimental data shows direct charge relationship.
A larger $|q|$ produces a larger measured force. Experimental data shows direct charge relationship.
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Identify the controlled variable when testing how distance affects electric force between two charges.
Identify the controlled variable when testing how distance affects electric force between two charges.
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Keep $q_1$ and $q_2$ constant. Control charges to isolate distance as variable.
Keep $q_1$ and $q_2$ constant. Control charges to isolate distance as variable.
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Identify the controlled variable when testing how magnet strength affects magnetic force at one distance.
Identify the controlled variable when testing how magnet strength affects magnetic force at one distance.
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Keep the distance between magnets constant. Control distance to isolate magnet strength as variable.
Keep the distance between magnets constant. Control distance to isolate magnet strength as variable.
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What happens to electric force magnitude if both charge magnitudes are doubled and distance stays the same?
What happens to electric force magnitude if both charge magnitudes are doubled and distance stays the same?
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It becomes $4$ times larger. Force scales with product of both charges.
It becomes $4$ times larger. Force scales with product of both charges.
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What happens to electric force magnitude if one charge’s magnitude is doubled and distance stays the same?
What happens to electric force magnitude if one charge’s magnitude is doubled and distance stays the same?
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It doubles. Force is directly proportional to charge magnitude.
It doubles. Force is directly proportional to charge magnitude.
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What is the rule for how magnetic force changes when the distance between magnets increases?
What is the rule for how magnetic force changes when the distance between magnets increases?
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Magnetic force decreases as distance increases. Force weakens with greater separation between magnets.
Magnetic force decreases as distance increases. Force weakens with greater separation between magnets.
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What is the rule for how electric force changes when the distance between charges increases?
What is the rule for how electric force changes when the distance between charges increases?
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Electric force decreases as distance increases. Force follows an inverse relationship with distance.
Electric force decreases as distance increases. Force follows an inverse relationship with distance.
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What happens to electric force magnitude if distance is doubled and charge magnitudes stay the same?
What happens to electric force magnitude if distance is doubled and charge magnitudes stay the same?
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It becomes $\frac{1}{4}$ as large. Doubling distance gives $\frac{1}{2^2}$ of original force.
It becomes $\frac{1}{4}$ as large. Doubling distance gives $\frac{1}{2^2}$ of original force.
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What happens to electric force magnitude if distance is tripled and charge magnitudes stay the same?
What happens to electric force magnitude if distance is tripled and charge magnitudes stay the same?
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It becomes $\frac{1}{9}$ as large. Tripling distance gives $\frac{1}{3^2}$ of original force.
It becomes $\frac{1}{9}$ as large. Tripling distance gives $\frac{1}{3^2}$ of original force.
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What happens to electric force magnitude if distance is cut in half and charges stay the same?
What happens to electric force magnitude if distance is cut in half and charges stay the same?
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It becomes $4$ times larger. Halving distance gives $\frac{1}{(1/2)^2} = 4$ times force.
It becomes $4$ times larger. Halving distance gives $\frac{1}{(1/2)^2} = 4$ times force.
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What happens to magnetic force if the strength of one magnet is increased while distance stays the same?
What happens to magnetic force if the strength of one magnet is increased while distance stays the same?
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Magnetic force increases. Stronger magnets produce stronger forces.
Magnetic force increases. Stronger magnets produce stronger forces.
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What happens to magnetic force if the strengths of both magnets are increased while distance stays the same?
What happens to magnetic force if the strengths of both magnets are increased while distance stays the same?
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Magnetic force increases more. Force depends on both magnets' strengths.
Magnetic force increases more. Force depends on both magnets' strengths.
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What is the interaction between a north pole and a south pole of magnets placed near each other?
What is the interaction between a north pole and a south pole of magnets placed near each other?
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Attraction. Opposite magnetic poles attract.
Attraction. Opposite magnetic poles attract.
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Which option states the distance change that makes electric force $4\times$ weaker?
Which option states the distance change that makes electric force $4\times$ weaker?
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Doubling the distance: $r \rightarrow 2r$ gives $F \rightarrow \frac{1}{4}F$. Since $F \propto \frac{1}{r^2}$, doubling distance reduces force by factor of 4.
Doubling the distance: $r \rightarrow 2r$ gives $F \rightarrow \frac{1}{4}F$. Since $F \propto \frac{1}{r^2}$, doubling distance reduces force by factor of 4.
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Which interaction occurs between two charges with the same sign?
Which interaction occurs between two charges with the same sign?
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Repulsion. Like charges (both positive or both negative) push each other away.
Repulsion. Like charges (both positive or both negative) push each other away.
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What is the formula for electric force magnitude between two point charges?
What is the formula for electric force magnitude between two point charges?
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$F = k\frac{|q_1 q_2|}{r^2}$. Coulomb's law formula where $k$ is the electrostatic constant.
$F = k\frac{|q_1 q_2|}{r^2}$. Coulomb's law formula where $k$ is the electrostatic constant.
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What is the relationship between electric force and charge amounts in Coulomb's law?
What is the relationship between electric force and charge amounts in Coulomb's law?
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Electric force increases with charge as $F \propto q_1 q_2$. Coulomb's law shows force is directly proportional to the product of charges.
Electric force increases with charge as $F \propto q_1 q_2$. Coulomb's law shows force is directly proportional to the product of charges.
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What is the relationship between electric force and distance in Coulomb's law?
What is the relationship between electric force and distance in Coulomb's law?
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Electric force decreases with distance as $F \propto \frac{1}{r^2}$. Coulomb's law shows force is inversely proportional to distance squared.
Electric force decreases with distance as $F \propto \frac{1}{r^2}$. Coulomb's law shows force is inversely proportional to distance squared.
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What does it mean if a magnet is described as having greater magnetic strength?
What does it mean if a magnet is described as having greater magnetic strength?
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It produces a stronger magnetic field and larger forces at the same distance. Stronger magnets create more intense magnetic fields.
It produces a stronger magnetic field and larger forces at the same distance. Stronger magnets create more intense magnetic fields.
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What is the qualitative relationship between magnetic force and distance for magnets?
What is the qualitative relationship between magnetic force and distance for magnets?
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Magnetic force decreases as distance increases. Like electric force, magnetic force weakens with greater separation.
Magnetic force decreases as distance increases. Like electric force, magnetic force weakens with greater separation.
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