Physics, 02.02.2020 02:43 mckinleesmomp6qj1e

Alana summarized what happens when a ball sitting on top of a grassy hill rolls down the hill.

the motionless ball has potential energy. once the ball starts to roll down the hill, new kinetic energy is made. as the ball rolls across the grass, it slows down. the kinetic energy of the ball is converted to other forms of energy.

which best describes alana’s error?

the motionless ball does not have energy because it is still.
kinetic energy is not made; it is a result of energy transformation.
the ball cannot slow down unless someone touches it.
the energy is not converted; it disappears.

Answers: 1

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Answer from: zchwilke2981

Kinetic energy is not made; it is a result of energy transformation.

Explanation:

Energy is neither created nor can be destroyed. Energy can transform from one form to another. It cannot appear or disappear from nowhere.

A body possess potential energy due to virtue of its position (height) and kinetic energy due to motion.

A ball sitting in top of grassy hill possess potential energy when it is motion less. When starts rolling down, part of the energy is converted into kinetic energy. It slows down to frictional force acting in the opposite direction and some of the kinetic energy is used to overcome the friction.

Thus, Allan's error is that Kinetic energy is not made; it is a result of energy transformation.

Answer from: alexisolsennn4680

Kinetic energy is not made; it is a result of energy transformation.

Explanation:

Energy is neither created nor can be destroyed. Energy can transform from one form to another. It cannot appear or disappear from nowhere.

A body possess potential energy due to virtue of its position (height) and kinetic energy due to motion.

Thus, Allan's error is that Kinetic energy is not made; it is a result of energy transformation.

Answer from: yansaturnin

Explanation:

Took quiz

Answer from: namekianball4

Explanation:

Took quiz

Answer from: Quest

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

Answer from: Quest

When someone eats food

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Alana summarized what happens when a ball sitting on top of a grassy hill rolls down the hill.
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