Q. Two blocks of masses $m_{1}=2\, kg$ and $m_{2}=4\, kg$ hang over a massless pulley as shown in the figure. A force $F_{0}=100\, N$ acting at the axis of the pulley accelerates the system upwards. Then

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A

acceleration of 2 kg mass is $15\, m / s ^{2}$

B

acceleration of 4 kg mass is $2.5\, m / s ^{2}$

C

acceleration of both the masses is same

D

acceleration of both the masses is upward

Solution:

Acceleration of $2 kg$ block
$\left(a_{2}\right)=\frac{50-20}{2}=15\, m / s ^{2} \uparrow$
Acceleration of $4\, kg$ block
$\left(a_{4}\right)=\frac{50-40}{4}=2.5\, m / s ^{2} \uparrow$

Questions from Laws of Motion

1. A coin placed on a rotating table just slips if it is placed at a distance $4r$ from the centre. If we double the angular velocity of the table, then the coin will just slip when it is away from the centre at a distance equal to

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2. Two bodies of mass $4\,kg$ and $6\,kg$ are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is :

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3. Three blocks are connected, as shown in the figure. Calculate the minimum force required to move the blocks with constant velocity. The co-efficient of friction at all surfaces is $0.25$ .

[Assume that rod does not exerts force in vertical direction]

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4. The normal reaction on a body placed in a lift moving up with constant acceleration $2 \, m \, s^{- 1}$ is $120 \, N$ . Mass of the body is (Take $g=10 \, m \, s^{- 2}$ )

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5. Consider the situation shown in the figure. The wall is smooth but the surfaces of blocks $A$ and $B$ in contact are rough. The friction on $A$ due to $B$ in equilibrium

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4. A wheel with $20$ metallic spokes each $1\, m$ long is rotated with a speed of $120\, rpm$ in a plane perpendicular to a magnetic field of $0.4\, G$. The induced emf between the axle and rim of the wheel will be, $(1 G = 10^{-4}\, T)$

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5. Calculate the acceleration of the block and trolly system shown in the figure The coefficient of kinetic friction between the trolly and the surface is $0.05. (g = 10 \,m/s^{2}$, mass of the string is negligible and no other friction exists

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Q. Two blocks of masses $m_{1}=2\, kg$ and $m_{2}=4\, kg$ hang over a massless pulley as shown in the figure. A force $F_{0}=100\, N$ acting at the axis of the pulley accelerates the system upwards. Then

acceleration of 2 kg mass is $15\, m / s ^{2}$

acceleration of 4 kg mass is $2.5\, m / s ^{2}$

acceleration of both the masses is same

acceleration of both the masses is upward

Acceleration of $2 kg$ block $\left(a_{2}\right)=\frac{50-20}{2}=15\, m / s ^{2} \uparrow$ Acceleration of $4\, kg$ block $\left(a_{4}\right)=\frac{50-40}{4}=2.5\, m / s ^{2} \uparrow$

Questions from Laws of Motion

1. A coin placed on a rotating table just slips if it is placed at a distance $4r$ from the centre. If we double the angular velocity of the table, then the coin will just slip when it is away from the centre at a distance equal to

2. Two bodies of mass $4\,kg$ and $6\,kg$ are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is :

3. Three blocks are connected, as shown in the figure. Calculate the minimum force required to move the blocks with constant velocity. The co-efficient of friction at all surfaces is $0.25$ . [Assume that rod does not exerts force in vertical direction]

4. The normal reaction on a body placed in a lift moving up with constant acceleration $2 \, m \, s^{- 1}$ is $120 \, N$ . Mass of the body is (Take $g=10 \, m \, s^{- 2}$ )

5. Consider the situation shown in the figure. The wall is smooth but the surfaces of blocks $A$ and $B$ in contact are rough. The friction on $A$ due to $B$ in equilibrium

Physics Most Viewed Questions

1. A car starts from rest and accelerates at $5\, m / s ^{2}$ At $t=4\, s$, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at $t =6\, s$ ? (Take $\left. g =10\, m / s ^{2}\right)$

2. The de Broglie wavelength of an electron moving with kinetic energy of $144 \,eV$ is nearly

3. If $E$ and $G$ respectively denote energy and gravitational constant, then $\frac{ E }{ G }$ has the dimensions of:

4. A wheel with $20$ metallic spokes each $1\, m$ long is rotated with a speed of $120\, rpm$ in a plane perpendicular to a magnetic field of $0.4\, G$. The induced emf between the axle and rim of the wheel will be, $(1 G = 10^{-4}\, T)$

5. Calculate the acceleration of the block and trolly system shown in the figure The coefficient of kinetic friction between the trolly and the surface is $0.05. (g = 10 \,m/s^{2}$, mass of the string is negligible and no other friction exists

Latest Updates

Acceleration of $2 kg$ block
$\left(a_{2}\right)=\frac{50-20}{2}=15\, m / s ^{2} \uparrow$
Acceleration of $4\, kg$ block
$\left(a_{4}\right)=\frac{50-40}{4}=2.5\, m / s ^{2} \uparrow$

3. Three blocks are connected, as shown in the figure. Calculate the minimum force required to move the blocks with constant velocity. The co-efficient of friction at all surfaces is $0.25$ .

[Assume that rod does not exerts force in vertical direction]