Two forces with equal magnitudes F act on a body and the magnitude of the resultant force is F/3. The angle between the two forces is 

(1) cos11718

(2) cos113

(3) cos123

(4) cos189

Concept Questions :-

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Three forces starts acting simultaneously on a particle moving with velocity v. These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity 

(1) v remaining unchanged

(2) Less than v

(3) Greater than v

(4) v in the direction of the largest force BC

Concept Questions :-

Application of laws
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Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of 2 m/s2 in the upward direction in both the blocks. If T and T’ be the tensions in the two parts of the string, then 

(1) T = 70.8 N and T’ = 47.2 N

(2) T = 58.8 N and T’ = 47.2 N

(3) T = 70.8 N and T’ = 58.8 N

(4) T = 70.8 N and T’ = 40.2 N

Concept Questions :-

Application of laws
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If two forces of 5 N each are acting along X and Y axes, then the magnitude and direction of resultant is 

(1) 52,  π/3

(2) 52,  π/4

(3) 52,  π/3

(4) 52,  π/4

Concept Questions :-

Types of forces
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A block is kept on a frictionless inclined surface with angle of inclination 'α'. The incline is given an acceleration 'a' to keep the block stationary. Then a is equal to 

(1) g

(2) g tan α

(3) g / tan α

(4) g cosec α

Concept Questions :-

Pseudo force
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A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be 

(1) P

(2) PmM+m

(3) PMM+m

(4) PmMm

Concept Questions :-

Application of laws
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Three equal weights A, B and C of mass 2 kg each are hanging on a string passing over a fixed frictionless pulley as shown in the figure The tension in the string connecting weights B and C is 

(1) Zero

(2) 13 N

(3) 3.3 N

(4) 19.6 N

Concept Questions :-

Application of laws
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Two masses of 4 kg and 5 kg are connected by a string passing through a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of 5 kg mass is

(1) 49 m/s2

(2) 5.44 m/s2

(3) 19.5 m/s2

(4) 2.72 m/s2

Concept Questions :-

Application of laws
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Two masses 2 kg and 3 kg are attached to the end of the string passed over a pulley fixed at the top. The tension and acceleration are

(1) 7g8;g8

(2) 21g8;g8

(3) 21g8;g5

(4) 12g5;g5

Concept Questions :-

Application of laws
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Three blocks A, B and C weighing 1, 8 and 27 kg respectively are connected as shown in the figure with an inextensible string and are moving on a smooth surface. T3 is equal to 36 N. Then T2 is 

(1) 18 N

(2) 9 N

(3) 3.375 N

(4) 1.25 N

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