Practice free Laws of Motion (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following statements about Newton's Third Law of Motion is INCORRECT?
According to the NCERT text, 'Action and reaction act on different bodies and so they cannot be cancelled out.' This is a common misconception, as forces can only cancel when acting on the same body.
A balloon is inflated and then released. The air rushes out of the nozzle, and the balloon moves in the opposite direction. This phenomenon best demonstrates which of Newton's laws of motion?
The expulsion of air (action) creates a thrust force on the balloon in the opposite direction (reaction), causing it to move. This is a direct application of Newton's Third Law: 'To every action, there is always an equal and opposite reaction'.
When a person walks, they push the ground backward with their feet. According to Newton's Third Law, the ground simultaneously:
The NCERT states, 'Force on a body A by body B is equal and opposite to the force on the body B by A.' When the person pushes the ground backward (action), the ground pushes the person forward (reaction), enabling them to move.
A force $F_{ ext{AB}}$ is exerted by body A on body B. According to Newton's Third Law, the force exerted by body B on body A, $F_{ ext{BA}}$, will satisfy which condition?
The NCERT text explicitly states, 'Force on a body A by body B is equal and opposite to the force on the body B by A'. This means the forces have the same magnitude but act in opposite directions, represented by the negative sign in the vector equation.
In the context of Newton's Third Law, what does the term 'action' refer to?
The NCERT states, 'Any of the two mutual forces can be called action and the other reaction. Action and reaction forces are simultaneous forces. There is no cause-effect relation between action and reaction.' This clarifies that 'action' does not imply precedence or causality in physics.
Which of the following scenarios best illustrates an action-reaction pair?
An action-reaction pair involves forces between two interacting bodies. When a person pushes a wall, the wall simultaneously pushes back on the person with an equal and opposite force. The other options describe forces acting on a single body or a single force component.
According to the NCERT text, why can't action and reaction forces cancel each other out?
The NCERT text clearly states, 'Action and reaction act on different bodies and so they cannot be cancelled out.' For forces to cancel, they must act on the same body.
Newton's Third Law primarily describes the interactions between:
The text states, 'Forces in nature always occur between pairs of bodies.' Newton's Third Law defines these mutual interactions.
The Law of Conservation of Momentum is a consequence of which other laws of motion?
The NCERT states, 'The law [of Conservation of Momentum] follows from the second and third law of motion.'
When a gun is fired, the bullet moves forward, and the gun recoils backward. This backward movement of the gun is due to:
The force exerted by the gun on the bullet (action) causes the bullet to move forward. Simultaneously, the bullet exerts an equal and opposite force on the gun (reaction), causing the gun to recoil. This is a classic example of Newton's Third Law.
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