FORCE

Tension T in the string connecting 10 kg and 5 kg blocks (as shown in the figure) is [g = 10 m/s]

• $\frac{200}{7\ }N$

• $\frac{300}{7}N$

• $\frac{400}{7}N$

• $\frac{100}{7}N$

Two identical blocks each of mass m are put on top of one another on a table. What is the magnitude and direction of reaction force on lower block by the table?

• mg upward

• mg downward

• 2mg upwards

• 2mg downwards

A block of mass 2 kg rests on a rough inclined plane making an angle of 30 degree with the horizontal. The coefficient of static friction between he block and the plane is 0.7. The frictional force on the block is

• 9.8 N

• 0.7 × 9.8 × √3 N

• 0.7 × 9.8 × √3 N

• 0.7 × 9.8 N

A block of wood is placed on a surface. A force is applied parallel to the surface to move the body. The frictional force developed acts

• normal to the surface upwards

• normal to the surface downwards

• along the direction of the applied force

• opposite to the direction of the applied force

Two bodies of masses 4 kg and 5 kg are acted upon by the same force. If the acceleration of lighter body is 2 m/s², the acceleration of heavier body is

• 1 m/s²

• 1.2 m/s²

• 1.6 m/s²

• 1.8 m/s²

A body is in the state of equilibrium under effect of three forces of equal magnitude. The angle between any two forces is

• 
  

  $\frac{2\pi}{3}$

• $\frac{\pi}{3}$

• $\frac{\pi}{6}$

• $\frac{\pi}{2}$

Strings A & B are massless and inextensible. Ratio of tension in string A to that in string B is

• 1:1

• 3:1

• 1:3

• 2:1

Two bodies of mass 5 kg and 3 kg respectively are connected to two ends of a light string passing over a frictionless pulley. The tension in the string is [g = 9.8 m/s²]

• 60 N

• 36.75 N

• 73.5 N

• 18 N

A block of mass m is placed on a smooth inclined plane of inclination θ with the horizontal. The force exerted by the plane on the block has a magnitude

• mg

• $mg\ \tan\theta$

• $\frac{mg}{\cos\theta}$

• $mg\ \cos\ \theta$

Force exerted by the spring on the block is, if mass of block is 5 kg

• 50 N

• 25 N

• 10 N

• 30 N