Exploring Internal Forces Through Newton's 3rd Law

The video tutorial explains internal forces using a person standing on a boat as an example. It illustrates Newton's third law through action-reaction pairs and force vectors. The relationship between mass and acceleration is discussed, showing how different masses affect acceleration rates. The concept of the center of mass is introduced, explaining its role and behavior in the system. Finally, the video analyzes the system's dynamics in the absence of external forces, emphasizing that the system's center of mass remains unchanged despite internal movements.

What is the initial setup of the system being considered in the video?

• A person standing on a stable boat

• A person sitting on a chair

• A person riding a bicycle

• A person walking on a treadmill

According to Newton's Third Law, what happens when the person pushes on the boat?

• The boat does not move

• The boat pushes back on the person with equal force

• The boat moves forward

• The person falls off the boat

Where does the exchange of forces take place when the person walks on the boat?

• At the person's hand

• At the boat's edge

• At the person's foot

• At the boat's center

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If the mass of the person is 70 kg and the mass of the boat is 35 kg, how do their accelerations compare?

• The person accelerates twice as fast as the boat

• The boat accelerates twice as fast as the person

• Both accelerate at the same rate

• The boat does not accelerate

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What is the relationship between mass and acceleration in this system?

• Less mass means less acceleration

• More mass means less acceleration

• Mass does not affect acceleration

• More mass means more acceleration

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Where is the center of mass located in a person?

• In the middle of the torso

• In the arms

• In the head

• In the legs

What happens to the center of mass of the system as the person walks on the boat?

• It remains in the same spot

• It moves forward

• It moves backward

• It moves to the side

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Why does the center of mass of the system not move?

• Because the forces are not equal

• Because there are no external forces acting on the system

• Because the person is heavier

• Because the boat is heavier

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What can be said about the sum of the forces on the system?

• The sum of the forces is positive

• The sum of the forces is negative

• The sum of the forces is zero

• The sum of the forces is infinite

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How can Newton's Third Law pairs help in solving problems?

• By focusing only on one object

• By linking different equations describing individual components

• By considering the system as a whole

• By ignoring external forces

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