A car of mass m starts from rest and acquires a velocity along east v → = v i ^ ( v > 0 ) in two seconds. Assuming the car moves with uniform acceleration, the force exerted on the car is:

m v 2 eastward and is due to friction on tyres exerted by the road.

m v 2 eastward and is exerted by the

more than m v 2 eastward exerted due to the engine and overcomes the friction of the road.

The motion of a particle of mass m is given by x = 0 for t < 0 s , x ( t ) = A sin 4 πt for 0 < t < 1 4 s . ( A > 0 ) and x = 0 for t > ( 1 4 ) s . Which of the following statements is true?

The particle is not acted upon by a constant force.

The particle is not acted upon by any force.

There is no impulse acting on the particle

In the given figure, the coefficient of friction between the noor and the body B is 0 . 1 . The coefficient of friction between bodies B and A is 0 . 2 . A force F is applied as shown on B . the mass of A is m / 2 and of B is m . Which of the following statements are true?

The maximum value of F → for which the two bodies will move together is 0 .45 mg .

The bodies will move together if F → = 0 . 5 mg

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Important Questions on Laws of Motion

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NCERT Exemplar Physics - Class 11>Chapter 5 - Laws of Motion>MCQ-I>Q 5.6

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is:

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NCERT Exemplar Physics - Class 11>Chapter 5 - Laws of Motion>MCQ-I>Q 5.7

A body of mass

2 kg

travels according to the law

x (t) = p t + q t^{2} + n t^{3}

, where

p = 3 m s^{- 1}, q = 4 m s^{- 2}

and

n = 5 m s^{- 3}

. The force acting on the body at

t = 2

seconds is:

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NCERT Exemplar Physics - Class 11>Chapter 5 - Laws of Motion>MCQ-I>Q 5.8

A body of mass

5 kg

is acted upon by a force

\vec{F} = (- 3 \hat{i} + 4 \hat{j}) N

. If its initial velocity at

t = 0

\vec{v} = (6 \hat{i} - 12 \hat{j}) m s^{- 1}

the time at which it will just have a velocity along the

y

axis is:

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NCERT Exemplar Physics - Class 11>Chapter 5 - Laws of Motion>MCQ-I>Q 5.9

A car of mass

m

starts from rest and acquires a velocity along east

\vec{v} = v \hat{i} (v > 0)

in two seconds. Assuming the car moves with uniform acceleration, the force exerted on the car is:

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NCERT Exemplar Physics - Class 11>Chapter 5 - Laws of Motion>MCQ-II>Q 5.10

The motion of a particle of mass

m

is given by

x = 0

for

t < 0 s, x (t) = A \sin 4 πt

for

0 < t < (\frac{1}{4}) s . (A > 0)

and

x = 0

for

t > (\frac{1}{4}) s

. Which of the following statements is true?

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NCERT Exemplar Physics - Class 11>Chapter 5 - Laws of Motion>MCQ-II>Q 5.11

In the given figure, the coefficient of friction between the noor and the body

B

0.1

. The coefficient of friction between bodies

B

and

A

0.2

. A force

F

is applied as shown on

B

. the mass of

A

m / 2

and of

B

m

. Which of the following statements are true?

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NCERT Exemplar Physics - Class 11>Chapter 5 - Laws of Motion>MCQ-II>Q 5.12

Mass $m_{1}$ moves on a slope making an angle $θ$ with the horizontal and is attached to mass $m_{2}$ by a string passing over a frictionless pulley as shown in the figure. The co-efficient of friction between $m_{1}$ and the sloping surface is $μ$ . Which of the following statements are true?

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NCERT Exemplar Physics - Class 11>Chapter 5 - Laws of Motion>MCQ-II>Q 5.13

In given figure, a body $A$ of mass $m$ slides on a plane inclined at an angle $θ_{1}$ to the horizontal and $μ_{1}$ is the coefficient of friction between $A$ and the plane. A is connected by a light string passing over a frictionless pulley to another body $B$ also of mass $m$ , sliding on a frictionless plane inclined at angle $θ_{2}$ to the horizontal. Which of the following statements are true?

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Important Questions on Laws of Motion

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