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2 years ago

A boy pushes his baby sister on a swing in the playground. At the top

Physics

1 answer:

Reil [10]2 years ago

8 0

Answer:

* If there is no friction U = 0, K = 200 J

* If there is friction U = 0, K = 200 - W

Explanation:

For this exercise we must make an assumption.

* If there is no friction

The energy of the system is conserved therefore the energy is transformed.

The potential energy is

U = m g h

at the bottom of the road there is no height therefore

U = 0

and all the energy has been transformed into kinetic energy

K = 200 J

* If there is friction, which can come from the internal friction of the car, the friction force between the car and the floor, etc.

in this case there is a loss of energy due to the work of non-conservative forces (friction).

The potential energy at the bottom of the path is hedron because there is no height U = 0

The kinetic energy is

K = U -W

K = 200 - W

where W is the work of the friction force.

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