Posted by **Mike** on Wednesday, June 29, 2005 at 3:07pm.

When a ball falls down from a height h, its P.E is transformed into K.E as it's free-falling, BUT.....

wot abt objects not falling freely?

So...

What happens to the potential energy of an aeroplane when it lands, does it change to K.E (well it already has tht, doesn't it?) + how can the P.E change to kinetic energy when the speed is controlled by the pilot n is decreasing?

SUMONE EXPLAIN PLSSSSSSSSSSS!

When a plane lands, its kinetic energy and potential energy both decrease. The lost energy becomes mostly eddy turbulent kinetic energy heating of the air. A small fraction goes into skin heating as well. This aerodynamic heating takes place at an increased rate (compared to air heating at cruising altitude), due to the use of air flaps, thrust reversers and the fact that there is a higher air density near the ground.

In this case according to Work-Energy theorem we get the following energy equation:

K.E + P.E = Work done by engine

Hope this help:

ken@mv.ru

Kinetic energy is a function of velocity squared while potential energy is a function of height above a plane of reference. Since a landing airplane reduces its velocity to zero, its kinetic energy reduces to zero. Once landed, its potential energy relative to the ground is also zero.

## Answer this Question

## Related Questions

- Physic - a steel ball dropped from a helicopter, and after 4s its acceleration ...
- physics. - : When the mass hits the pile, it has kinetic energy. This energy is ...
- science - please help me im stuck on this last one !! .A car driver accelerates ...
- Physics - A ball of mass 8 kg falls from rest from a height of 100 m. Neglecting...
- physics - a ball of mass 8kg falls from rest from a height of 100m.neglecting ...
- science (check new answer) - please check my answser .A car driver accelerates ...
- physics - a boy who is 1.5m tall throws a ball into the air the ball attains a ...
- physics - Imagine that you throw a ball vertically upwards from the rooftop of a...
- Physics - A ball of mass 8kg falls from rest from a height of 100m neglecting ...
- Physics - A 2kg block is released from rest at position A and falls 12 meters to...

More Related Questions