Predict Collision Motion - Middle School Physical Science
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Find and correct the error: "In a collision, the heavier object exerts a larger force on the lighter object."
Find and correct the error: "In a collision, the heavier object exerts a larger force on the lighter object."
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Correct: Both objects exert equal-magnitude forces on each other. Newton's Third Law states forces are equal regardless of mass.
Correct: Both objects exert equal-magnitude forces on each other. Newton's Third Law states forces are equal regardless of mass.
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Which force pair is a valid Third Law pair: hand on wall and wall on hand, or hand on wall and floor on hand?
Which force pair is a valid Third Law pair: hand on wall and wall on hand, or hand on wall and floor on hand?
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Hand on wall and wall on hand. Valid pairs involve the same two objects exerting forces on each other.
Hand on wall and wall on hand. Valid pairs involve the same two objects exerting forces on each other.
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A bowling ball hits a pin. Which object experiences the larger force during contact?
A bowling ball hits a pin. Which object experiences the larger force during contact?
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Neither; both experience equal-magnitude forces. Newton's Third Law: forces are always equal regardless of mass.
Neither; both experience equal-magnitude forces. Newton's Third Law: forces are always equal regardless of mass.
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What does the phrase "equal and opposite" mean for collision forces, in terms of magnitude?
What does the phrase "equal and opposite" mean for collision forces, in terms of magnitude?
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The magnitudes are the same: $|F_{A o B}|=|F_{B o A}|$. "Equal" refers to magnitude; "opposite" refers to direction.
The magnitudes are the same: $|F_{A o B}|=|F_{B o A}|$. "Equal" refers to magnitude; "opposite" refers to direction.
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What happens to acceleration when the same force acts on a larger mass during a collision?
What happens to acceleration when the same force acts on a larger mass during a collision?
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Acceleration is smaller for the larger mass. From $a= rac{F}{m}$: larger mass means smaller acceleration.
Acceleration is smaller for the larger mass. From $a= rac{F}{m}$: larger mass means smaller acceleration.
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State the formula relating net force, mass, and acceleration used after a collision.
State the formula relating net force, mass, and acceleration used after a collision.
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$F_{net}=ma$. Newton's Second Law relates force, mass, and acceleration.
$F_{net}=ma$. Newton's Second Law relates force, mass, and acceleration.
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Which option correctly identifies why action–reaction forces do not cancel each other?
Which option correctly identifies why action–reaction forces do not cancel each other?
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They act on different objects, so they cannot cancel on one object. Forces can only cancel if they act on the same object.
They act on different objects, so they cannot cancel on one object. Forces can only cancel if they act on the same object.
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What is the key rule about which objects feel the forces in a Third Law pair?
What is the key rule about which objects feel the forces in a Third Law pair?
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Each force acts on a different object. Forces in a Third Law pair never act on the same object.
Each force acts on a different object. Forces in a Third Law pair never act on the same object.
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What is the direction relationship between forces in a Newton's Third Law pair?
What is the direction relationship between forces in a Newton's Third Law pair?
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They point in opposite directions. Third Law pairs always point in opposite directions along the same line.
They point in opposite directions. Third Law pairs always point in opposite directions along the same line.
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Identify the correct comparison of forces when a truck collides with a car.
Identify the correct comparison of forces when a truck collides with a car.
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Truck-on-car force equals car-on-truck force in magnitude. Newton's Third Law applies regardless of object masses.
Truck-on-car force equals car-on-truck force in magnitude. Newton's Third Law applies regardless of object masses.
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Which statement correctly describes an action–reaction force pair in a collision?
Which statement correctly describes an action–reaction force pair in a collision?
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Forces are equal in size and opposite in direction, on different objects. Third Law pairs always act on different objects, preventing cancellation.
Forces are equal in size and opposite in direction, on different objects. Third Law pairs always act on different objects, preventing cancellation.
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What does Newton's Third Law state about the forces two objects exert on each other?
What does Newton's Third Law state about the forces two objects exert on each other?
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They exert equal-magnitude, opposite-direction forces on each other. This is the fundamental statement of Newton's Third Law.
They exert equal-magnitude, opposite-direction forces on each other. This is the fundamental statement of Newton's Third Law.
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Identify the correct acceleration ratio if the same force acts on masses $m_1$ and $m_2$.
Identify the correct acceleration ratio if the same force acts on masses $m_1$ and $m_2$.
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$ rac{a_1}{a_2}= rac{m_2}{m_1}$. From $F=ma$ with equal forces: accelerations are inversely proportional to masses.
$ rac{a_1}{a_2}= rac{m_2}{m_1}$. From $F=ma$ with equal forces: accelerations are inversely proportional to masses.
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A $2,\text{kg}$ cart and a $6,\text{kg}$ cart collide and exert equal forces. Which cart has greater $|a|$?
A $2,\text{kg}$ cart and a $6,\text{kg}$ cart collide and exert equal forces. Which cart has greater $|a|$?
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The $2,\text{kg}$ cart has greater $|a|$. Smaller mass has larger acceleration when forces are equal: $a= rac{F}{m}$.
The $2,\text{kg}$ cart has greater $|a|$. Smaller mass has larger acceleration when forces are equal: $a= rac{F}{m}$.
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Two skaters push off. Skater A mass is $50,\text{kg}$ and B is $75,\text{kg}$. Who has greater $|a|$?
Two skaters push off. Skater A mass is $50,\text{kg}$ and B is $75,\text{kg}$. Who has greater $|a|$?
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Skater A ($50,\text{kg}$) has greater $|a|$. Lighter skater accelerates more with equal push forces: $a= rac{F}{m}$.
Skater A ($50,\text{kg}$) has greater $|a|$. Lighter skater accelerates more with equal push forces: $a= rac{F}{m}$.
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If object A pushes object B to the right during a collision, what is the direction of the force on A from B?
If object A pushes object B to the right during a collision, what is the direction of the force on A from B?
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To the left. Newton's Third Law: forces are always opposite in direction.
To the left. Newton's Third Law: forces are always opposite in direction.
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A $1,\text{kg}$ ball hits a $3,\text{kg}$ ball; contact force magnitude is $12,\text{N}$. Find each ball's $|a|$.
A $1,\text{kg}$ ball hits a $3,\text{kg}$ ball; contact force magnitude is $12,\text{N}$. Find each ball's $|a|$.
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$|a_1|=12,\text{m/s}^2$, $|a_3|=4,\text{m/s}^2$. Use $a= rac{F}{m}$: $a_1= rac{12}{1}=12$, $a_3= rac{12}{3}=4$.
$|a_1|=12,\text{m/s}^2$, $|a_3|=4,\text{m/s}^2$. Use $a= rac{F}{m}$: $a_1= rac{12}{1}=12$, $a_3= rac{12}{3}=4$.
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A $4,\text{kg}$ object experiences $10,\text{N}$ during collision. What is the acceleration magnitude?
A $4,\text{kg}$ object experiences $10,\text{N}$ during collision. What is the acceleration magnitude?
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$2.5,\text{m/s}^2$. Apply $a= rac{F}{m}= rac{10}{4}=2.5,\text{m/s}^2$.
$2.5,\text{m/s}^2$. Apply $a= rac{F}{m}= rac{10}{4}=2.5,\text{m/s}^2$.
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Two objects collide. Object A feels $-8,\text{N}$ (left). What force does A exert on B?
Two objects collide. Object A feels $-8,\text{N}$ (left). What force does A exert on B?
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$+8,\text{N}$ (right). Third Law pairs have equal magnitude but opposite direction.
$+8,\text{N}$ (right). Third Law pairs have equal magnitude but opposite direction.
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During a collision, if the contact force magnitude increases, what happens to both objects' force magnitudes?
During a collision, if the contact force magnitude increases, what happens to both objects' force magnitudes?
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Both increase equally (still opposite in direction). Action-reaction forces always have equal magnitudes at every instant.
Both increase equally (still opposite in direction). Action-reaction forces always have equal magnitudes at every instant.
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Identify the correct name for the two forces described by Newton's Third Law.
Identify the correct name for the two forces described by Newton's Third Law.
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An action–reaction force pair. Newton's Third Law describes pairs of forces between interacting objects.
An action–reaction force pair. Newton's Third Law describes pairs of forces between interacting objects.
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Which statement is correct: action–reaction forces act on the same object or on different objects?
Which statement is correct: action–reaction forces act on the same object or on different objects?
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They act on different objects. Each force in the pair acts on a separate object, not the same one.
They act on different objects. Each force in the pair acts on a separate object, not the same one.
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What is the relationship between the magnitudes of forces in an action–reaction pair?
What is the relationship between the magnitudes of forces in an action–reaction pair?
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Equal magnitudes. Newton's Third Law requires action-reaction forces to have the same magnitude.
Equal magnitudes. Newton's Third Law requires action-reaction forces to have the same magnitude.
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What is the relationship between the directions of forces in an action–reaction pair?
What is the relationship between the directions of forces in an action–reaction pair?
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Opposite directions. Action-reaction forces point in exactly opposite directions along the same line.
Opposite directions. Action-reaction forces point in exactly opposite directions along the same line.
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Identify the action–reaction partner to the force of a bat on a ball during a hit.
Identify the action–reaction partner to the force of a bat on a ball during a hit.
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The force of the ball on the bat. By Newton's Third Law, the ball exerts an equal force back on the bat.
The force of the ball on the bat. By Newton's Third Law, the ball exerts an equal force back on the bat.
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