MEDIUM
JEE Main/Advance
IMPORTANT
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A man of mass 60 kg is standing on a weighing machine placed in a lift moving with velocity v and acceleration a as shown in the figure. Calculate the reading of the weighing machine in the following situations: (g=10 m s-2)

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 (i) a=0, v=0

(ii) a=0, v=2 m s-1

(iii) a=0, v=-2 m s-1

(iv) a=2 m s-2, v=0

(v) a= 2 m s-2, v=0

(vi) a=2 m s-2, v=2 m s-1

(vii) a=2 m s-2, v= 2 m s-1

(viii) a= 2 m s-2, v= 2 m s-1

Important Questions on Laws of Motion

MEDIUM
JEE Main/Advance
IMPORTANT

What will be the reading of spring balance in the figure shown in following situations (g=10 m s-2).

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 (i) a=0, v=0

(ii) a=0, v=2 m s-1

(iii) a=0, v=-2 m s-1

(iv) a=2 m s-2, v=0

(v) a= 2 m s-2, v=0

(vi) a=2 m s-2, v=2 m s-1

(vii) a=2 m s-2, v= 2 m s-1

(viii) a= 2 m s-2, v= 2 m s-1

HARD
JEE Main/Advance
IMPORTANT

Three identical balls A, B, C are suspended on springs one below the other as shown in the figure. OA is a weightless thread. The balls are in equilibrium

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 (a) If the thread is cut, the system starts falling. Find the acceleration of all the balls at the initial instant

(b) Find the initial accelerations of all the balls if we cut the spring BC, which is supporting ball 3, instead of cutting the thread.

 

MEDIUM
JEE Main/Advance
IMPORTANT

Man A of mass 60 kg pushes the other man B of mass 75 kg due to which man B starts moving with acceleration 3 m s-2. Calculate the acceleration of man A at that instant.

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MEDIUM
JEE Main/Advance
IMPORTANT

Find the acceleration of the 6 kg block in the figure. All the surfaces and pulleys are smooth. Also the strings are inextensible and light. [Take g=10 m s-2]

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MEDIUM
JEE Main/Advance
IMPORTANT

A painter of mass M stands on a platform of mass m and pulls himself up by two ropes which hang over pulley as shown. He pulls each rope with the force F and moves upward with uniform acceleration a. Find a.

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MEDIUM
JEE Main/Advance
IMPORTANT

Three monkeys A, B and C with masses of 10, 15 and 8 kg respectively are climbing up and down the rope suspended from D. At the instant represented, A is descending the rope with an acceleration of 2 m s-2 and C is pulling itself up with an acceleration of 1.5 m s-2. Monkey B is climbing up with a constant speed of 0.8 m s-1. Calculate the tension T in the rope at D. (g=10 m s-2)

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EASY
JEE Main/Advance
IMPORTANT

An object of mass 2 kg moving with constant velocity 10i^ m s-1 is seen in a frame moving with constant velocity 10i^ m s-1. What will be the value of ‘pseudo force’ acting on object in this frame.

EASY
JEE Main/Advance
IMPORTANT

In the adjoining figure, a wedge is fixed to an elevator moving upwards with an acceleration a. A block of mass m is placed over the wedge. Find the acceleration of the block with respect to the wedge. Neglect friction.

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