Key insights

• 🔍 Forces always come in pairs, Newton's third law states every force is part of an interaction between two objects, Equal and opposite forces are exerted on each other by the two objects
• 🔍 Swimmer pushes water backwards to move forward, Water exerts force back on the swimmer, Interaction between the swimmer and the water
• 🔍 Two forces involved in water - action force and reaction force, They are core parts of a single interaction, Neither force exists without the other
• 🔍 Newton's third law: action and reaction equal and opposite, Action-reaction forces do not cancel out when acting on different objects
• 🛹 Boy on a skateboard initially at rest, Pushes against the wall, As the boy pushes, he moves away from the wall, Action force exerted by the boy on the wall, Reaction force exerted by the wall against the boy, Identifying reaction force in different situations
• 🛹 Puddle's reaction force moves the boat, Walking exerts force on the ground which pushes back, Sitting applies weight on the chair and receives support force

Q&A

• How can we understand the concept of action and reaction forces in different situations?

  Understanding the law of interaction involves identifying action forces and their corresponding reaction forces. For instance, a boy on a skateboard pushes against a wall, resulting in the action force exerted by the boy on the wall and the reaction force exerted by the wall against the boy. Such understanding helps in recognizing reaction forces in various scenarios.

• Can you provide an example of action-reaction forces in everyday scenarios?

  Certainly, in everyday scenarios, the reaction force of a puddle moves a boat, walking exerts force on the ground which pushes back, and sitting applies weight on a chair, receiving support force. These examples demonstrate the application of action and reaction forces in common situations.

• Do action and reaction forces cancel out according to Newton's third law?

  No, action and reaction forces do not cancel out, especially when they act on different objects. They are equal and opposite forces that are part of the interaction between the objects involved.

• How does the swimmer move forward in the water?

  The swimmer moves forward by pushing against the water, causing the water to exert an equal and opposite force, propelling the swimmer forward. This demonstrates the action and reaction forces in water.

• Why do forces always come in pairs according to Newton's third law?

  Forces always come in pairs because for every force, there is an equal and opposite force as part of the interaction between two objects.

• What does Newton's third law of motion state?

  Newton's third law states that every force is part of an interaction between two objects exerting equal and opposite forces on each other.

• 00:03 🔍 Forces always come in pairs according to Newton's third law of motion, which states that every force is part of an interaction between two objects exerting equal and opposite forces on each other.
• 00:57 The swimmer moves forward because the water pushes them in the opposite direction when they exert force underwater.
• 01:36 Forces in water involve a pair of action and reaction forces that are essential parts of a single interaction.
• 02:17 🔍 Newton's third law states that for every action, there is an equal and opposite reaction. Action and reaction forces do not cancel out as they act on different objects.
• 03:04 🛹 Understanding the law of interaction: action force and reaction force
• 03:48 Understanding action-reaction forces in everyday scenarios: puddle's reaction force moves the boat, walking exerts force on the ground which pushes back, sitting applies weight on the chair and receives support force