MEDIUM
Earn 100

State and explain Aristotelian law of motion.

Important Questions on Laws of Motion

EASY

Two blocks A and B are placed one over the other on a smooth horizontal surface. The maximum horizontal force that can be applied on lower block A, so that A and B move without separation is 49 N. The coefficient of friction between A and B is

Question Image

EASY
Three blocks A, B and C, of masses 4 kg, 2 kg 1 kg and respectively, are in contact on a frictionless surface, as shown. If a force of 14 N  is applied on the 4 kg block, then the contact force between A and B is:

Question Image
MEDIUM
A balloon with mass m is descending down with an acceleration a (where a<g). How much mass should be removed from it so that it starts moving up with an acceleration a?
EASY
The Nobel laureate ABDUS SALAM is known for discovery of
EASY

The given graph shows the variation of velocity v with position x for a particle moving along a straight line

Question Image

Which of the following graph shows the variation of acceleration a with position x?

HARD

A maximum of 3 N force can be applied on a block, down the incline, that would still not move the block which is placed on a rough inclined plane as shown in the figure. The maximum external force up the inclined plane that does not move the block is 12 N. The coefficient of static friction between the block and the plane is Take g=10 m s-2

Question Image

MEDIUM
Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively
Question Image
EASY
A body of weight W1 is suspended from the ceiling of a room through a chain of weight W2. The ceiling pulls the chain by a force
MEDIUM
The displacement x (in meter) of a particle of mass m (in kg) moving in one dimension under the action of a force, is related to time t (in sec) by t=x+3. The displacement of the particle when its velocity is zero, will be
HARD
A helicopter rises from rest on the ground vertically upwards with a constant acceleration g. A food packet is dropped from the helicopter when it is at a height h. The time taken by the packet to reach the ground is close to [g is the acceleration due to gravity]:
MEDIUM

A rectangular frame of some mass has to be suspended symmetrically by two mass-less strings of equal length on two supports. It can be done in one of the three following ways as shown in below figures. The tension in the strings will be

Question Image

MEDIUM
A vehicle moving at 36 km/h is to be stopped by applying brakes in the next 5 m. If the vehicle weight 2000 kg, determine the average force that must be applied on it
HARD
A rope of length L and uniform linear density is hanging from the ceiling. A transverse wave pulse, generated close to the free end of the rope, travels upwards through the rope. Select the correct option.
MEDIUM
An automobile moving with a speed of 36 km h-1 reaches an upward inclined road of angle 30°, its engine becomes switch off. If the coefficient of friction is 0.1, then how much distance will automobile move before coming to rest?
EASY
Consider the following statements about the four fundamental forces in nature.
(i) The strong nuclear force binds protons and neutrons in a nucleus.
(ii) The strong nuclear force is about 103 times the electromagnetic force in strength.
(iii) The weak nuclear force is the weakest of all the four fundamental forces.
(iv) The range of the weak nuclear is about 10-16 m
The correct statement(s) is (are)
EASY
Force of friction and tension in a string are ___________ in origin
EASY

The length of a metal wire is 1, when the tension in it is T1 and is 2 when the tension is T2. The natural length of the wire is:

HARD

Three balls, A, B and C are released and all reach the point X (shown in the figure). Balls A and B are released from two identical structures, one kept on the ground and the other at height h from the ground as shown in the figure. They take time tA and tB respectively to reach X (time starts after they leave the end of the horizontal portion of the structure). The ball C is released from a point at height h vertically above X and reaches X in time tC. Choose the correct statement.

Question Image

MEDIUM

A spherical body of mass 2 kg starting from rest acquires a kinetic energy of 10000 J at the end of 5th  second. The force acted on the body is _____ N.

HARD
In an hour-glass approximately 100 grains of sand fall per second (starting from rest); and it takes 2 s for each sand particle to reach the bottom of the hour-glass. If the average mass of each sand particle is 0.2 g, then the average force exerted by the falling sand on the bottom of the hour-glass is close to