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# 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.

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get 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. from EN Bilgi.

## lana summarized what happens when a ball sitting on top of a grassy hill rolls down the hill. The motionless ball has potential

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

## lana summarized what happens when a ball sitting on top of a grassy hill rolls down the hill. The motionless ball has potential

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## lana summarized what happens when a ball sitting on top of a grassy hill rolls down the hill. The motionless ball has potential

Question

lana 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.

in progress 0 Physics Thành Đạt 5 months 1 Answers 18 views 0 Share

Philomena 0

August 16, 2021 at 7:09 am

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

Explanation:

Let’s discuss what happens to the ball when it is on top of the mountain and rolls down.

Initially the ball has a total mechanical energy, which at this point is potential.

Em₀ = U = mg h

When the ball starts to roll down, part of this potential energy will be transformed into kinetic energy.

Em = K + U = ½ m v² + mg y

but mechanical energy is conserved.

The presence of the grass introduces a force in the opposite direction that creates a friction force work (not conservative), for which the total mechanical energy decreases

W_{friction}= Emf – Emo

When examining the answers, the one that best describes Lana’s error is:

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

Source : documen.tv

## Energy Transformations Flashcards

Start studying Energy Transformations. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

## Energy Transformations

4.6 32 Reviews

Eddie and Val observed the picture of an athlete running in a race.

Eddie stated the picture shows potential energy being transformed to kinetic energy. Val stated that it shows chemical energy being transformed to mechanical energy. Which best explains who is correct?

Click card to see definition 👆

Both Eddie and Val are correct because chemical energy is a type of potential energy and mechanical energy includes kinetic energy.

Click again to see term 👆

Plants are responsible for a very important energy transformation, as shown.

Which energy transformation does the picture best illustrate?

Click card to see definition 👆

Click again to see term 👆

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### Terms in this set (10)

Eddie and Val observed the picture of an athlete running in a race.

Eddie stated the picture shows potential energy being transformed to kinetic energy. Val stated that it shows chemical energy being transformed to mechanical energy. Which best explains who is correct?

Both Eddie and Val are correct because chemical energy is a type of potential energy and mechanical energy includes kinetic energy.

Plants are responsible for a very important energy transformation, as shown.

Which energy transformation does the picture best illustrate?

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?

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

The diagram shows a swinging pendulum.

Which best explains what happens to the motion of the pendulum?

The mechanical energy transforms to thermal energy as the pendulum slows and eventually stops moving.

Energy can be transformed from one form to another. The diagram shows one such process.

Which energy transformation is represented in the diagram?

Simone created a chart to summarize the energy transformations that take place when energy from the wind is used to generate electricity.

Which best completes the chart?

NOT

nuclear energy transformed to electrical energy

Which activity directly converts energy from the Sun into chemical energy?

a bean plant making its own food to grow

Solar-powered cars use energy from the Sun to work. A panel on the car absorbs light energy from the Sun, which then generates an electric current. This electric current, in turn, allows the car to move. Which shows the correct order of energy transformations that take place in a solar-powered car?

Which is an example of transforming potential energy to kinetic energy? Check all that apply.

NOT

changing chemical energy to thermal energy

changing nuclear energy to radiant energy

changing radiant energy to electrical energy

changing mechanical energy to chemical energy

The human body stores chemical energy from digested food. Some of the chemical energy is converted into mechanical energy when the body moves. Which statement is best supported by this information?

Digested food is a source of potential energy.

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## Energy Transformations

Find and create gamified quizzes, lessons, presentations, and flashcards for students, employees, and everyone else. Get started for free!

QUIZ

## Energy Transformations

Energy Transformations 48%

5 7th Science Elizabeth Jones 1 year

## 16 Qs

1. Multiple-choice 30 seconds Q.

What are the two main types of energy?

potential and chemical

kinetic and potential

2. Multiple-choice 30 seconds Q.

Which activity directly converts energy from the Sun into chemical energy?

a snake lying on a sunny rock to keep warm

a rabbit using energy from food it has eaten to run

a bean plant making its own food to grow

a person burning firewood to cook food

3. Multiple-choice 30 seconds Q.

The image shows a dam. Which descriptions best fit the labels?

answer choices X: kinetic energy Y: potential energy X: potential energy Y: kinetic energy

X: mechanical energy

Y: electrical energy

X: electrical energy

Y: mechanical energy

4. Multiple-choice 30 seconds Q.

Savion listed the steps involved when nuclear power plants generate electricity.

1. Nuclear reaction occurs. 2. Nuclear energy is converted to radiant and thermal energy. 3. Heat is used to generate steam. 4. Light and heat are released. 5. Steam turns turbines. 6. Mechanical energy is converted to electrical energy.

Which best explains how to correct Savion’s error?

In step 2, change “radiant and thermal ” to “chemical and mechanical.”

Reorder the steps so that step 4 appears before step 3.

Reorder the steps so that step 6 appears before step 5.

In step 6, change “mechanical” to “thermal.”

5. Multiple-choice 30 seconds Q.

The human body stores chemical energy from digested food. Some of the chemical energy is converted into mechanical energy when the body moves. Which statement is best supported by this information?

The body does not convert chemical energy to thermal energy.

The body does not convert chemical energy to kinetic energy.

Digested food is a source of potential energy.

Digested food is a form of radiant energy.

6. Multiple-choice 30 seconds Q.

The human body stores chemical energy from digested food. Some of the chemical energy is converted into mechanical energy when the body moves. Which statement is best supported by this information?

The body does not convert chemical energy to thermal energy.

The body does not convert chemical energy to kinetic energy.

Digested food is a source of potential energy.

Digested food is a form of radiant energy.

7. Multiple-choice 30 seconds Q.

Plants are responsible for a very important energy transformation, as shown. Which energy transformation does the picture best illustrate?

nuclear to mechanical

chemical to thermal

mechanical to chemical

8. Multiple-choice 30 seconds Q.

Energy can be transformed from one form to another. The diagram shows one such process. Which energy transformation is represented in the diagram?

nuclear to electrical and chemical

chemical to electrical and nuclear

9. Multiple-choice 30 seconds Q.

Solar-powered cars use energy from the Sun to work. A panel on the car absorbs light energy from the Sun, which then generates an electric current. This electric current, in turn, allows the car to move. Which shows the correct order of energy transformations that take place in a solar-powered car?

electrical, chemical, kinetic

10. Multiple-choice 30 seconds Q.

Eddie and Val observed the picture of an athlete running in a race. Eddie stated the picture shows potential energy being transformed to kinetic energy. Val stated that it shows chemical energy being transformed to mechanical energy. Which best explains who is correct?

Only Eddie is correct because the picture does not show a transformation that starts with chemical energy.

Only Eddie is correct because the picture does not show a transformation that ends with mechanical energy.

Both Eddie and Val are correct because chemical energy is a type of potential energy and mechanical energy includes kinetic energy.

Both Eddie and Val are correct because chemical energy is a type of kinetic energy and mechanical energy includes potential energy.

11. Multiple-choice 30 seconds Q.

During nuclear fission and fusion, what is matter that seems to disappear actually converted into?

answer choices mass energy volume nuclei 12. Multiple-choice 30 seconds Q.

The diagram shows a swinging pendulum. Which best explains what happens to the motion of the pendulum due to the law of conservation of energy?