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Laws of Motion

270372 Displacements of $1 kg$ and $2 kg$ blocks upto that instant $(g = 10 m / s^{2})$

1

4 m

towards right,

7 m

towards right

2

4 m

towards left,

7 m

towards right

3

4 m

towards left,

7 m

towards left

4

4 m

towards right,

7 m

towards left

Explanation:

$a = μ g; v = u + a t; s = u t + \frac{1}{2} a t^{2}$

Laws of Motion

270374 Three blocksare kept as shown in figure. Acceleration of $20 kg$ block with respect to ground is

1

5 {ms}^{- 2}

2

2 {ms}^{- 2}

3

1 {ms}^{- 2}

4 0

Laws of Motion

270373 A $2 kg$ block is pressed against a rough wall by a force $F = 20 N$ as shown in figure. find acceleration of the block and force of friction acting on it. (Take $g = 10 m / s^{2}$ )

1

4 m / \sec^{2}

downward,

12 N

upward

2

2 m / \sec^{2}

downward,

6 N

upward

3

12 m / \sec^{2}

downward,

4 N

upward

4

8 m / \sec^{2}

downward,

12 N

upward

Explanation:

$f_{s} = μ_{s} m g; W < f_{s}; f_{k} = μ_{k} m g; a = \frac{F_{net}}{m}$

Laws of Motion

270363 A block of mass $m = 4 kg$ is placed over a rough inclined plane having coefficient of friction $μ = 0.6$ as shown in fig. A force $F = 10 N$ is applied on the block at an angle $30^{\circ}$ . The contact force between the block and the plane is

1

10.65 N

2

16.32 N

3

27.15 N

4

32.16 N

Explanation:

Draw FBD, $N + F \sin α = m g \cos θ$
$f = μ N, R = \sqrt{N^{2} + f^{2}}$

Laws of Motion

270372 Displacements of $1 kg$ and $2 kg$ blocks upto that instant $(g = 10 m / s^{2})$

1

4 m

towards right,

7 m

towards right

2

4 m

towards left,

7 m

towards right

3

4 m

towards left,

7 m

towards left

4

4 m

towards right,

7 m

towards left

Explanation:

$a = μ g; v = u + a t; s = u t + \frac{1}{2} a t^{2}$

Laws of Motion

270374 Three blocksare kept as shown in figure. Acceleration of $20 kg$ block with respect to ground is

1

5 {ms}^{- 2}

2

2 {ms}^{- 2}

3

1 {ms}^{- 2}

4 0

Laws of Motion

270373 A $2 kg$ block is pressed against a rough wall by a force $F = 20 N$ as shown in figure. find acceleration of the block and force of friction acting on it. (Take $g = 10 m / s^{2}$ )

1

4 m / \sec^{2}

downward,

12 N

upward

2

2 m / \sec^{2}

downward,

6 N

upward

3

12 m / \sec^{2}

downward,

4 N

upward

4

8 m / \sec^{2}

downward,

12 N

upward

Explanation:

$f_{s} = μ_{s} m g; W < f_{s}; f_{k} = μ_{k} m g; a = \frac{F_{net}}{m}$

Laws of Motion

270363 A block of mass $m = 4 kg$ is placed over a rough inclined plane having coefficient of friction $μ = 0.6$ as shown in fig. A force $F = 10 N$ is applied on the block at an angle $30^{\circ}$ . The contact force between the block and the plane is

1

10.65 N

2

16.32 N

3

27.15 N

4

32.16 N

Explanation:

Draw FBD, $N + F \sin α = m g \cos θ$
$f = μ N, R = \sqrt{N^{2} + f^{2}}$

Laws of Motion

270372 Displacements of $1 kg$ and $2 kg$ blocks upto that instant $(g = 10 m / s^{2})$

1

4 m

towards right,

7 m

towards right

2

4 m

towards left,

7 m

towards right

3

4 m

towards left,

7 m

towards left

4

4 m

towards right,

7 m

towards left

Explanation:

$a = μ g; v = u + a t; s = u t + \frac{1}{2} a t^{2}$

Laws of Motion

270374 Three blocksare kept as shown in figure. Acceleration of $20 kg$ block with respect to ground is

1

5 {ms}^{- 2}

2

2 {ms}^{- 2}

3

1 {ms}^{- 2}

4 0

Laws of Motion

270373 A $2 kg$ block is pressed against a rough wall by a force $F = 20 N$ as shown in figure. find acceleration of the block and force of friction acting on it. (Take $g = 10 m / s^{2}$ )

1

4 m / \sec^{2}

downward,

12 N

upward

2

2 m / \sec^{2}

downward,

6 N

upward

3

12 m / \sec^{2}

downward,

4 N

upward

4

8 m / \sec^{2}

downward,

12 N

upward

Explanation:

$f_{s} = μ_{s} m g; W < f_{s}; f_{k} = μ_{k} m g; a = \frac{F_{net}}{m}$

Laws of Motion

270363 A block of mass $m = 4 kg$ is placed over a rough inclined plane having coefficient of friction $μ = 0.6$ as shown in fig. A force $F = 10 N$ is applied on the block at an angle $30^{\circ}$ . The contact force between the block and the plane is

1

10.65 N

2

16.32 N

3

27.15 N

4

32.16 N

Explanation:

Draw FBD, $N + F \sin α = m g \cos θ$
$f = μ N, R = \sqrt{N^{2} + f^{2}}$

Laws of Motion

270372 Displacements of $1 kg$ and $2 kg$ blocks upto that instant $(g = 10 m / s^{2})$

1

4 m

towards right,

7 m

towards right

2

4 m

towards left,

7 m

towards right

3

4 m

towards left,

7 m

towards left

4

4 m

towards right,

7 m

towards left

Explanation:

$a = μ g; v = u + a t; s = u t + \frac{1}{2} a t^{2}$

Laws of Motion

270374 Three blocksare kept as shown in figure. Acceleration of $20 kg$ block with respect to ground is

1

5 {ms}^{- 2}

2

2 {ms}^{- 2}

3

1 {ms}^{- 2}

4 0

Laws of Motion

270373 A $2 kg$ block is pressed against a rough wall by a force $F = 20 N$ as shown in figure. find acceleration of the block and force of friction acting on it. (Take $g = 10 m / s^{2}$ )

1

4 m / \sec^{2}

downward,

12 N

upward

2

2 m / \sec^{2}

downward,

6 N

upward

3

12 m / \sec^{2}

downward,

4 N

upward

4

8 m / \sec^{2}

downward,

12 N

upward

Explanation:

$f_{s} = μ_{s} m g; W < f_{s}; f_{k} = μ_{k} m g; a = \frac{F_{net}}{m}$

Laws of Motion

270363 A block of mass $m = 4 kg$ is placed over a rough inclined plane having coefficient of friction $μ = 0.6$ as shown in fig. A force $F = 10 N$ is applied on the block at an angle $30^{\circ}$ . The contact force between the block and the plane is

1

10.65 N

2

16.32 N

3

27.15 N

4

32.16 N

Explanation:

Draw FBD, $N + F \sin α = m g \cos θ$
$f = μ N, R = \sqrt{N^{2} + f^{2}}$