(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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Chapter

Newton's Laws of Motion and Friction

Subtopic

Third Law of Motion and Momentum and Impulse

$A$ block of mass $2 \ kg$ moves freely along the $x$-axis. It is at rest at $t = 0$. The force $F(t)$ acting on the block varies with time $t$ as shown in the figure. What is the kinetic energy of the block after $4.5 \ s$ (in $J$)?

Medium

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$A$ gun applies a force $F$ on a bullet which is given by $F = (100 - 0.5 \times 10^{5} t) \ N$. The bullet emerges out with a speed of $400 \ m/s$. Find the impulse exerted until the force on the bullet becomes zero (in $N \cdot s$).

MediumAIIMS 2019

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$A$ boy hits a baseball with a bat and imparts an impulse $J$ to the ball. The boy hits the ball again with the same force,except that the ball and the bat are in contact for twice the amount of time as in the first hit. The new impulse equals:

Medium

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If a force of $250\, N$ acts on a body,the momentum acquired is $125\, kg \cdot m/s$. What is the period for which the force acts on the body? ......... $s$

Easy

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Action and reaction forces act on

Easy

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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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$A$ block of mass $2 \ kg$ moves freely along the $x$-axis. It is at rest at $t = 0$. The force $F(t)$ acting on the block varies with time $t$ as shown in the figure. What is the kinetic energy of the block after $4.5 \ s$ (in $J$)?

$A$ gun applies a force $F$ on a bullet which is given by $F = (100 - 0.5 \times 10^{5} t) \ N$. The bullet emerges out with a speed of $400 \ m/s$. Find the impulse exerted until the force on the bullet becomes zero (in $N \cdot s$).

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If a force of $250\, N$ acts on a body,the momentum acquired is $125\, kg \cdot m/s$. What is the period for which the force acts on the body? ......... $s$

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