(B) For a convex bridge,the net centripetal force is provided by the difference between the weight and the normal reaction: $Mg - N = \frac{mv^2}{R}$.

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$A$ car moving over a convex bridge is heavier than the same car resting on the same bridge.

(B) For a convex bridge,the net centripetal force is provided by the difference between the weight and the normal reaction: $Mg - N = \frac{mv^2}{R}$.Thus,$N = Mg - \frac{mv^2}{R}$,which implies $N For a concave bridge,the net centripetal force is provided by the difference between the normal reaction and the weight: $N - Mg = \frac{mv^2}{R}$.Thus,$N = Mg + \frac{mv^2}{R}$,which implies $N > Mg$. The car feels heavier.Therefore,statement $B$ is incorrect because the car is lighter,not heavier,on a convex bridge.

Class 11 Physics Newton's Laws of Motion and Friction Mix Examples-Newton's Laws of Motion and Friction

Medium

Identify the incorrect statement.

A
$A$ car moving over a convex bridge is lighter than the same car resting on the same bridge.
B
$A$ car moving over a convex bridge is heavier than the same car resting on the same bridge.
C
$A$ car moving over a concave bridge is heavier than the same car resting on the same bridge.
D
The weight of the car changes due to the centrifugal force in the above cases.

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Newton's Laws of Motion and Friction

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Mix Examples-Newton's Laws of Motion and Friction

$A$ ball is dropped on the floor from a height of $20 \ m$. It rebounds to a height of $5 \ m$. The ball remains in contact with the floor for $1 \ s$. The average acceleration during contact is (acceleration due to gravity $g = 10 \ m/s^2$): (in $m/s^2$)

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In which of the following cases is the contact force between $A$ and $B$ maximum? (Given: $m_A = m_B = 1 \ kg$)

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$A$ system consists of three masses $m_1, m_2$ and $m_3$ connected by a string passing over a pulley $P$. The mass $m_1$ hangs freely and $m_2$ and $m_3$ are on a rough horizontal table (the coefficient of friction $= \mu$). The pulley is frictionless and of negligible mass. The downward acceleration of mass $m_1$ is (Assume $m_1 = m_2 = m_3 = m$)

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Identify the incorrect statement.

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$A$ ball is dropped on the floor from a height of $20 \ m$. It rebounds to a height of $5 \ m$. The ball remains in contact with the floor for $1 \ s$. The average acceleration during contact is (acceleration due to gravity $g = 10 \ m/s^2$): (in $m/s^2$)

$A$ balloon of mass $m$ is descending down with an acceleration $\frac{g}{2}$. How much mass should be removed from it so that it starts moving up with the same acceleration?

In which of the following cases is the contact force between $A$ and $B$ maximum? (Given: $m_A = m_B = 1 \ kg$)

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