In which of the following cases the net force is NOT equal to zero? A) A kite held stationary in the sky. B) A ball falling freely from a height. C) A helicopter hovering above the ground. D) A cork floating on the surface of water.
Answers
Answered by
7
Answer:
a ball falling freely from a height
Explanation:
because total force is acting downward.
Answered by
0
Answer: A kite with zero net force is one that has been expertly held still in the air. A ball is freely falling from a height in the second scenario. A ball freely falling from a height in this scenario is not experiencing zero net force.
Explanation:
- We can say that the body perceives a force when it undergoes a push-pull effect or changes position. If the body is in stable condition and does not change shape or size, a force can be zero. Additionally, the force zeroes out when the body has constant velocity.
- In the first instance, a kite is held still and flying through the air. It takes some work at initially to move through the air, but once it reaches a specific altitude, the kite receives enough air to fly. A kite with zero net force is one that has been expertly held still in the air.
- A ball is freely falling from a height in the second scenario. A ball falling freely from a height in this scenario would not experience zero net force. The ball encounters a gravitational force from the Earth when it is falling from a height, and it also accelerates as a result of the gravitational force.
- In the third scenario, a helicopter rises at a 45-degree angle while moving at a constant speed, therefore there is no force acting on the aircraft.
- The cork is stable in the fourth scenario because it floats on the water's surface. The cork would not experience any force as a result.
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