Assertion : A ball tied by thread is undergoing circular motion (of radius R ) in a vertical plane. (Thread always remains in vertical plane). The difference of maximum and minimum tension in thread is independent of speed ( u ) of ball at the lowest position ( u > 5 g R ) . Reason: For a ball of mass $m$ tied by thread undergoing vertical circular motion (of radius R ), difference in maximum and minimum magnitude of centripetal acceleration of the ball is independent of speed ( u ) of ball at the lowest position ( u > 5 g R ) .

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true.

A bullet of 4 g mass is fired from a gun of mass 4 kg . If the bullet moves with the muzzle speed of 50 ms 1 , the impulse imparted to the gun and velocity of recoil of gun are

0 . 2 kg m s - 1 , 0 . 05 m s - 1

0 . 4 kg m s - 1 , 0 . 1 m s - 1

0 . 2 kg m s - 1 , 0 . 1 m s - 1

0 . 4 kg m s - 1 , 0 . 05 m s - 1

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Meena applies the front brakes while riding on her bicycle along a flat road. The force that slows her bicycle is provided by the

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Important Questions on Laws of Motion

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Physics Crash Course NEET>Chapter 3 - Laws of Motion>Level 2>Q 37

A solid cylinder of mass $m$ is wrapped with an inextensible light string and, is placed on a rough inclined plane as shown in the figure. The frictional force acting between the cylinder and the inclined plane is:

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[The coefficient of static friction, $μ_{s}$ , is $0.4$ ]

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Physics Crash Course NEET>Chapter 3 - Laws of Motion>Level 2>Q 38

The normal reaction

N

for a vehicle of

800 kg

mass, negotiating a turn on a

30 °

banked road at maximum possible speed without skidding is ____

\times 10^{3} kg m s^{- 2}

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Physics Crash Course NEET>Chapter 3 - Laws of Motion>Level 2>Q 39

If a block of mass '

m

' placed on a plane inclined at an angle

θ

, is on the verge of sliding, then the coefficient of friction between the block and the plane is given by

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Physics Crash Course NEET>Chapter 3 - Laws of Motion>Level 2>Q 40

Consider the system shown below.

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A horizontal force $F$ is applied to a block $X$ of mass $8 kg$ such that the block $Y$ of mass $2 kg$ adjacent to it does not slip downwards under gravity. There is no friction between the horizontal plane and the base of the block $X$ . The coefficient of friction between the surfaces of the blocks $X$ and $Y$ is $0.5$ . Take acceleration due to gravity to be $10 m s^{- 2}$ . The minimum value of $F$ is

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Physics Crash Course NEET>Chapter 3 - Laws of Motion>Level 2>Q 41

A particle is moving with a constant speed along a straight line path. A force is not required to:

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Physics Crash Course NEET>Chapter 3 - Laws of Motion>Level 2>Q 42

A force of

50

dynes is acted on a body of mass

5 g

which is at rest for an interval of

3 s,

then impulse is

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Physics Crash Course NEET>Chapter 3 - Laws of Motion>Level 2>Q 43

A body of mass

0.5 kg

is projected under gravity with a speed of

98 {ms}^{- 1}

at an angle of

60 °

with the vertical. The change in momentum [in magnitude] of the body when it returns on ground is

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Physics Crash Course NEET>Chapter 3 - Laws of Motion>Level 2>Q 44

Assertion: A ball tied by thread is undergoing circular motion (of radius

R

) in a vertical plane. (Thread always remains in vertical plane). The difference of maximum and minimum tension in thread is independent of speed

(u)

of ball at the lowest position

(u > \sqrt{5 g R}) .

Reason: For a ball of mass $m$ tied by thread undergoing vertical circular motion (of radius

R

), difference in maximum and minimum magnitude of centripetal acceleration of the ball is independent of speed

(u)

of ball at the lowest position

(u > \sqrt{5 g R}) .

Meena applies the front brakes while riding on her bicycle along a flat road. The force that slows her bicycle is provided by the

Important Questions on Laws of Motion

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