Newton's Third Law - AP Physics C: Mechanics
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Identify the reaction force when a bird perches on a branch.
Identify the reaction force when a bird perches on a branch.
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Branch exerts force on bird. The branch supports the bird with upward force.
Branch exerts force on bird. The branch supports the bird with upward force.
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What is the reaction force when a person sits on a chair?
What is the reaction force when a person sits on a chair?
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Chair pushes person upward. The normal force balances the person's weight.
Chair pushes person upward. The normal force balances the person's weight.
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What is the action-reaction pair when a person rows a boat?
What is the action-reaction pair when a person rows a boat?
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Oar on water, water on oar. Water resistance propels the boat forward.
Oar on water, water on oar. Water resistance propels the boat forward.
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What is the reaction force when a horse pulls a cart?
What is the reaction force when a horse pulls a cart?
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Cart pulls back on horse. Tension forces act equally on horse and cart.
Cart pulls back on horse. Tension forces act equally on horse and cart.
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Identify the forces when a person leans against a wall.
Identify the forces when a person leans against a wall.
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Wall exerts equal force back. The wall provides equal support force.
Wall exerts equal force back. The wall provides equal support force.
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What happens when two billiard balls collide?
What happens when two billiard balls collide?
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Each exerts equal force on the other. Newton's Third Law governs all collision forces.
Each exerts equal force on the other. Newton's Third Law governs all collision forces.
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Describe the forces when a child jumps on a trampoline.
Describe the forces when a child jumps on a trampoline.
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Trampoline pushes child upward. The trampoline's elastic force creates upward motion.
Trampoline pushes child upward. The trampoline's elastic force creates upward motion.
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What is the action-reaction pair when a baseball is caught by a glove?
What is the action-reaction pair when a baseball is caught by a glove?
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Ball on glove, glove on ball. Contact forces between objects are always paired.
Ball on glove, glove on ball. Contact forces between objects are always paired.
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Identify the reaction force when a bullet is fired from a gun.
Identify the reaction force when a bullet is fired from a gun.
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Gun recoils backward. Conservation of momentum causes the gun to move backward.
Gun recoils backward. Conservation of momentum causes the gun to move backward.
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What is the reaction force when a dancer pushes off the floor?
What is the reaction force when a dancer pushes off the floor?
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Floor pushes dancer upward. The floor provides reaction force for upward motion.
Floor pushes dancer upward. The floor provides reaction force for upward motion.
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Describe the forces when a person kicks a soccer ball.
Describe the forces when a person kicks a soccer ball.
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Ball exerts force on foot. Both objects experience equal magnitude forces.
Ball exerts force on foot. Both objects experience equal magnitude forces.
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What happens when a diver pushes off a diving board?
What happens when a diver pushes off a diving board?
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Board pushes diver upward. The diving board's reaction creates upward thrust.
Board pushes diver upward. The diving board's reaction creates upward thrust.
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Identify the action-reaction pair when a skier pushes against the snow.
Identify the action-reaction pair when a skier pushes against the snow.
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Skier on snow, snow on skier. Friction forces enable skiing through Newton's Third Law.
Skier on snow, snow on skier. Friction forces enable skiing through Newton's Third Law.
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What is the reaction force when a person slaps water?
What is the reaction force when a person slaps water?
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Water pushes back on hand. Water exerts equal force in the opposite direction.
Water pushes back on hand. Water exerts equal force in the opposite direction.
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Describe the forces when a person uses a rowing machine.
Describe the forces when a person uses a rowing machine.
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Machine pulls person backward. The rowing motion creates equal and opposite forces.
Machine pulls person backward. The rowing motion creates equal and opposite forces.
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What is the action-reaction pair when a cyclist pedals a bike?
What is the action-reaction pair when a cyclist pedals a bike?
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Pedals on feet, feet on pedals. Pedal forces create equal reactions for propulsion.
Pedals on feet, feet on pedals. Pedal forces create equal reactions for propulsion.
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What is the action-reaction pair when you jump off a boat?
What is the action-reaction pair when you jump off a boat?
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Feet on boat, boat on feet. Both forces are equal, causing opposite motion directions.
Feet on boat, boat on feet. Both forces are equal, causing opposite motion directions.
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In terms of forces, what occurs when a swimmer pushes water backwards?
In terms of forces, what occurs when a swimmer pushes water backwards?
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Water pushes swimmer forward. Water's reaction force creates forward propulsion.
Water pushes swimmer forward. Water's reaction force creates forward propulsion.
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Identify the reaction force when a bird perches on a branch.
Identify the reaction force when a bird perches on a branch.
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Branch exerts force on bird. The branch supports the bird with upward force.
Branch exerts force on bird. The branch supports the bird with upward force.
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What is the reaction when a magnet pulls a piece of iron?
What is the reaction when a magnet pulls a piece of iron?
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Iron pulls magnet. Magnetic forces are mutual and equal in magnitude.
Iron pulls magnet. Magnetic forces are mutual and equal in magnitude.
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Which force pair demonstrates Newton's Third Law in a car collision?
Which force pair demonstrates Newton's Third Law in a car collision?
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Car on wall, wall on car. The collision creates equal and opposite forces between objects.
Car on wall, wall on car. The collision creates equal and opposite forces between objects.
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Explain the forces involved when a jet engine expels exhaust gases.
Explain the forces involved when a jet engine expels exhaust gases.
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Gases push engine forward. Expelled gases create equal and opposite thrust.
Gases push engine forward. Expelled gases create equal and opposite thrust.
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Identify the reaction force when a person punches a punching bag.
Identify the reaction force when a person punches a punching bag.
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Bag exerts force on hand. The bag pushes back with equal force.
Bag exerts force on hand. The bag pushes back with equal force.
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What is the reaction force when a person spins a wheel?
What is the reaction force when a person spins a wheel?
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Wheel exerts torque back on hand. Rotational forces also follow Newton's Third Law.
Wheel exerts torque back on hand. Rotational forces also follow Newton's Third Law.
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Identify the reaction force when a hammer strikes a nail.
Identify the reaction force when a hammer strikes a nail.
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Nail exerts force on hammer. The nail pushes back with equal force on impact.
Nail exerts force on hammer. The nail pushes back with equal force on impact.
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State the action-reaction pair when a bird flies by flapping wings.
State the action-reaction pair when a bird flies by flapping wings.
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Wings on air, air on wings. Air pushes wings upward as wings push air downward.
Wings on air, air on wings. Air pushes wings upward as wings push air downward.
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What happens when two ice skaters push off each other?
What happens when two ice skaters push off each other?
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Each skater moves in opposite directions. Equal and opposite forces cause mutual acceleration.
Each skater moves in opposite directions. Equal and opposite forces cause mutual acceleration.
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What happens when a car tire pushes back on the road?
What happens when a car tire pushes back on the road?
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Road pushes tire forward. Friction from the road propels the car forward.
Road pushes tire forward. Friction from the road propels the car forward.
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Identify the action-reaction pair in a tug-of-war game.
Identify the action-reaction pair in a tug-of-war game.
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Team on rope, rope on team. Each team experiences equal tension forces.
Team on rope, rope on team. Each team experiences equal tension forces.
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What is the reaction when a magnet pulls a piece of iron?
What is the reaction when a magnet pulls a piece of iron?
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Iron pulls magnet. Magnetic forces are mutual and equal in magnitude.
Iron pulls magnet. Magnetic forces are mutual and equal in magnitude.
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