Why are objects that fall near Earth's surface rarely in free fall?
1 answer:
Answer: Air exerts forces on falling objects near Earth's surface.
Explanation: Objects falling near the earth surface are rarely in free fall due to the force exerted by air on falling object near the earth( air resistance).
The acceleration of free fall tend to pull the body towards the earth surface while air resistance (drag) tends to act in the opposite direction.
Given that the weight of the body is always constant.
The drag acts in the upward direction, thereby negating the downward weight of the object.
From Newton's Second law:
Force = mass × acceleration due to gravity
Acceleration = force / mass
The net force acting on the object becomes :
(Downward weight - upward drag)
This hampers the free fall of the object due to gravity.
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Answer:
The magnitude of the large object's momentum change is 3 kilogram-meters per second.
Explanation:
Under the assumption that no external forces are exerted on both the small object and the big object, whose situation is described by the Principle of Momentum Conservation:
(1)
Where:
,
- Initial and final momemtums of the small object, measured in kilogram-meters per second.
,
- Initial and final momentums of the big object, measured in kilogram-meters per second.
If we know that ,
and
, then the final momentum of the big object is:
The magnitude of the large object's momentum change is:
The magnitude of the large object's momentum change is 3 kilogram-meters per second.