(D) According to Newton's third law,for every action,there is an equal and opposite reaction. When the student pulls his hair,he exerts a force on his

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The force applied is internal to the system.

(D) According to Newton's third law,for every action,there is an equal and opposite reaction. When the student pulls his hair,he exerts a force on his hair,and his hair exerts an equal and opposite force on his hand. Since both the student and his hair are part of the same system,these forces are internal forces. Internal forces cannot change the state of motion of the center of mass of a system. Therefore,the student cannot lift himself up.

Class 11 Physics Newton's Laws of Motion and Friction Third Law of Motion and Momentum and Impulse

Easy

$A$ student attempts to pull himself up by tugging on his hair. He will not succeed because:

A
The force exerted is small.
B
The frictional force while gripping is small.
C
Newton's law of inertia is not applicable to living beings.
D
The force applied is internal to the system.

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Physics Questions

Chapter

Newton's Laws of Motion and Friction

Subtopic

Third Law of Motion and Momentum and Impulse

The average force necessary to stop a hammer with momentum $p \; Ns$ in $0.5 \; s$ is .......... $N$.

Easy

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$A$ ball of mass $0.1 \,kg$ strikes a wall normally with a speed of $30 \,ms^{-1}$ and rebounds with a speed of $20 \,ms^{-1}$. The impulse of the force exerted by the wall on the ball is (in $\,N-s$)

MediumMHT CET 2012

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Two objects of different masses have the same momentum. Which of the two objects will be moving faster?

Easy

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The $F-t$ graph for an object is shown in the figure. What will be the magnitude of the change in momentum $(\Delta p)$ in the interval of $0.03\, s$ from the start?

Easy

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$A$ $150\, g$ tennis ball coming at a speed of $40\, m/s$ is hit straight back by a bat to a speed of $60\, m/s$. The magnitude of the average force $F$ on the ball,when it is in contact for $5\, ms$,is ........... $N$.

MediumAIIMS 2011

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$A$ student attempts to pull himself up by tugging on his hair. He will not succeed because:

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The average force necessary to stop a hammer with momentum $p \; Ns$ in $0.5 \; s$ is .......... $N$.

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