Apendulum has 592 j of potential energy at the highest point of its swing. how much kinetic energy will it have at the bottom of its swing?| units:

592 J

Explanation:

When neglecting air resistance or frictions, the mechanical energy of an object in motion is conserved.

Mechanical energy is defined as the sum of potential energy (U) and kinetic energy (K):

At the highest point of its swing, the pendulum has only potential energy (because its motion has stopped), therefore its mechanical energy at the highest point is:

On the contrary, at the lowest point of its swing, the pendulum has only kinetic energy, because it is a its lowest height, so the potential energy is zero, and all the mechanical energy is just kinetic energy:

And since for the conservation of energy E must be conserved, we have

so, the kinetic energy at the bottom of its swing is 592 J.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.