Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 4

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Rohit and Ram were firing from their guns. The gun of Rohit was heavier than the gun of Ram. Recoil speed of

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Important Questions on Laws of Motion

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Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 5

Two particles of masses

m_{1}

and

m_{2}

in projectile motion have velocities

{\vec{v}}_{1}

and

{\vec{v}}_{2}

, respectively, at time

t = 0

. They collide at time

t_{0}

. Their velocities become

{\vec{v}'}_{1}

and

{\vec{v}'}_{2}

at time

2 t_{0}

while still moving in air. The value of

| (m_{1} \vec{v}'_{1} + m_{2} {\vec{v}'}_{2}) - (m_{1} {\vec{v}}_{1} + m_{2} {\vec{v}}_{2}) |

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Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 6

At the instant

t = 0,

a force

F = k t

(

k

is a constant) acts on a small body of mass

m

resting on a smooth horizontal surface. The time, when the body leaves the surface is

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Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 7

A block of mass 4 kg is suspended through two light spring balances A and B in series. Then A and B will read respectively.

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Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 8

A body of mass

50 g

is moving with a constant velocity of

5 m s^{- 1}

on a horizontal smooth surface. The force acting on the body is

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Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 9

A box is placed on the bed of a truck. When the truck accelerates in the forward direction, then the direction of the force of friction between the lower surface of the box and the bed of the truck is

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Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 10

The static force of friction

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Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 11

Rolling friction is

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Physics Crash Course NDA & NA EE>Chapter 4 - Laws of Motion>Exercise 1>Q 12

Three blocks

A

,

B

and

C

of equal mass

m

are placed one over the other on a smooth horizontal ground as shown in the figure. Coefficient of friction between any two blocks is

0.5

. The maximum value of the mass of block

D

so that the blocks

A

,

B

and

C

move without slipping over each other is

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