(1) According to first law of motion F = 0 as a = 0 (particle moves with constant speed)

 (2) Since kite is stationary net force on the kite is also zero.

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(1) If the force is deforming force then it does not produce acceleration.

 (2) The force is internal force which cannot cause acceleration.

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Hey student.
 

(1) It shows that the motion is accelerated only when force is applied.

(2) It gives us the concept of inertial mass of a body.

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When the bird starts flying inside the cage the weight of bird is no more experienced as air inside is in free contact with atmospheric air hence the cage will appear lighter.

A cyclist leans while going along curve because a component of normal reaction of the ground provides him the centripetal force he requires for turning.

He has to lean inwards from his vertical position i.e. towards the centre of the circular path.

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(i) Gravitational force acting on the planet and the sun provides the necessary centripetal force.

(ii) Force of gravity due to earth on the moon provides centripetal force.

(iii) Electrostatic force attraction between the electron and the proton provides  the necessary centripetal force.

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(a) Zero net force

The rain drop is falling with a constant speed. Hence, it acceleration is zero. As per Newton's second law of motion, the net force acting on the rain drop is zero.

(b) Zero net force

The weight of the cork is acting downward. It is balanced by the buoyant force exerted by the water in the upward direction. Hence, no net force is acting on the floating cork.

(c) Zero net force

The kite is stationary in the sky, i.e., it is not moving at all. Hence, as per Newton's first law of motion, no net force is acting on the kite.

(d) Zero net force

The car is moving on a rough road with a constant velocity. Hence, its acceleration is zero. As per Newton's second law of motion, no net force is acting on the car.

(e) Zero net force

The high speed electron is free from the influence of all fields. Hence, no net force is acting on the electron.

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(a) In order to pull a cart, a horse pushes the ground backward with some force. The ground  in turn exerts an equal and opposite reaction force upon the feet of the horse. This reaction force causes the horse to move forward.

An empty space is devoid of any such reaction force. Therefore, a horse cannot pull a cart and run in empty space.

(b) When a speeding bus stops suddenly, the lower portion of a passenger's body, which is in contact with the seat, suddenly comes to rest. However, the upper portion tends to remain in motion (as per the first law of motion). As a result, the passenger's upper body is thrown forward in the direction in which the bus was moving.

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