MEDIUM
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A horse pulls a 250 kg cart with a force of 250 N at an angle of 30° If the cart moves with constant velocity, find the friction force, the applied force in both the horizontal and vertical directions, the object's weight, and the normal force.

Important Questions on Laws of Motion

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
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
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
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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.
EASY
In a tug war contest, two man pull on a horizontal rope from opposite sides. The winner will be the man who
EASY
Assertion: The third law of motion concludes that the forces occur in pairs of action and reaction.

Reason: The action force is more than the reaction force.
EASY

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is –

MEDIUM
A 2000 kg rocket in free space expels 0.5 kg of gas per second at an exhaust velocity of 400 m s-1 for 5 seconds. The increase in the speed of the rocket in this time is (Assume time interval is too small to consider variation in acceleration)
EASY
Explain why a horse cannot pull a cart and run in empty space.
EASY
A bullet of mass 5 g is shot from a gun of mass 5 kg. The muzzle velocity of the bullet is 500 m s-1. The recoil velocity of the gun is,
MEDIUM

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

EASY
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 _____.
EASY
Assertion: A block is pulled by external force F as shown in figure. In equilibrium external force and spring force on block are action and reaction pair.

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Reason: Action and reaction pair are always equal and opposite.
MEDIUM

The string between blocks of mass m and 2m is massless and inextensible. The system is suspended by a massless spring as shown. If the string is cut find the magnitudes of accelerations of mass 2m and m (immediately after cutting)

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EASY
In the figure shown, a balloon is pressed against a wall. It is in equilibrium and maximum compressed state.
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F 1 = force of balloon on hand of man; F 2 = force of balloon on wall; F 3 =  friction; F 4 =  weight of balloon. Choose the correct statement.
EASY
Consider a horse pulling a wagon. Which of the statements below is the correct one ?
EASY
Assertion: The third law of motion concludes that the forces occur in pairs of action and reaction.

Reason: The action force is more than the reaction force.
EASY
A man weighing 50 kg is standing at one end on a boat of length 25 m and mass 200 kg. If he starts running, and when he reaches the other end, he has a velocity of 2 m s-1 with respect to the boat. The final velocity of the boat is (in m s-1)
EASY
Assertion: If pseudo force on a body is assumed as action then frictional force may be reaction for this action.

Reason: Action-reaction must acts on different bodies.
MEDIUM
Assertion: Newton's third law of motion is applicable only when bodies are in motion.

Reason: Newton's third law applies to only forces, e.g. gravitational, electricstatic forces etc.