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Questions and Answers
What is the name given to Newton's third law of motion?
What is the name given to Newton's third law of motion?
- The Action-Reaction Law (correct)
- Law of Universal Gravitation
- The Law of Inertia
- The Law of Momentum
What happens when one object exerts a force on another object?
What happens when one object exerts a force on another object?
- The second object exerts a force in the same direction
- The second object exerts a force in the opposite direction (correct)
- The second object exerts no force at all
- The second object moves at a constant velocity
What is the reason why action forces and reaction forces do not cancel each other out?
What is the reason why action forces and reaction forces do not cancel each other out?
- Because the forces are not opposite
- Because the forces are not simultaneous
- Because the forces are not equal
- Because the forces act on different objects (correct)
What is the result of the person exerting a force on the water in the rowboat example?
What is the result of the person exerting a force on the water in the rowboat example?
What is the relationship between the action force and the reaction force in Newton's third law?
What is the relationship between the action force and the reaction force in Newton's third law?
What would happen if the equal and opposite forces were exerted on the same object?
What would happen if the equal and opposite forces were exerted on the same object?
What is the main idea behind Newton's third law of motion?
What is the main idea behind Newton's third law of motion?
What happens when the action and reaction forces occur on the same object?
What happens when the action and reaction forces occur on the same object?
Why can't a person in a rowboat propel the boat forward on land?
Why can't a person in a rowboat propel the boat forward on land?
What is the reaction force exerted on a rocket ship due to its engine?
What is the reaction force exerted on a rocket ship due to its engine?
How do fighter jets operate?
How do fighter jets operate?
What is the purpose of a water mill according to Newton's third law of motion?
What is the purpose of a water mill according to Newton's third law of motion?
What is the result of the action force exerted by a person's muscles on the ground while walking?
What is the result of the action force exerted by a person's muscles on the ground while walking?
What happens when a person in a rowboat exerts a force on the water?
What happens when a person in a rowboat exerts a force on the water?
What is necessary for a rocket ship to propel upward?
What is necessary for a rocket ship to propel upward?
Study Notes
Newton's Third Law of Motion
- For every action, there is an equal and opposite reaction.
- When one object exerts a force on a second object, the second object exerts a force on the first that is equal but opposite in direction.
Examples of Action and Reaction Forces
- Rowboat: person exerts force on water using a paddle, and the water exerts a reaction force on the person and the rowboat.
- Rocket ships: engine propels an action force on expanding gases, and the expanding gases exert an equal reaction force on the rocket, propelling it upward.
- Fighter jets: engine exerts an action force on air behind it, and the air exerts a reaction force on the fighter jet, propelling it forward.
- Cars: engine and tires exert an action force on the ground, and the ground exerts a reaction force on the car, pushing it forward.
- Bicycles and walking: muscles create an action force on the ground, and the ground exerts a reaction force on the person, allowing them to move forward.
Key Points
- Action forces and reaction forces are equal but opposite in direction.
- Forces do not cancel each other out because they act on different objects.
- The cancellation of motion occurs only when both action and reaction forces are exerted on the same object.
Applications of Newton's Third Law of Motion
- Conversion of motion into electricity, e.g., using a water mill to generate electricity.
- Rocket propulsion: the action force of the engine is equal to the reaction force of the expanding gases, propelling the rocket upward.
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Description
Explore Newton's third law of motion, also known as the action-reaction law, which states that every action has an equal and opposite reaction. Learn how it applies to forces and interactions between objects. Test your understanding with this quiz!
