# Why Doesn't a Dropped Ball Bounce Back to Its Original Height?

• B Cass
In summary, when a ball is dropped from a height h and strikes the ground, it undergoes a change of shape due to the collision. This change in shape causes some of the kinetic energy to be transferred into heat, resulting in a loss of energy. As a result, the ball does not rebound back to the same height h, but rather to a maximum height that is less than h. This is due to the fact that the collision is not perfectly elastic and some energy is lost.
B Cass
"When a ball is dropped to the floor from a height h, it strikes the ground and briefly undergoes a change of shape before rebounding to a max ht. less than h. Explain why it does not return to the same height h."

Is this because some of the kinetic energy is transferred to heat?? What does the shape change have to do with it? I know I'm making this more complex than it has to be! TIA!

Yes, an amount of kinetic energy is transformed into heat caused by the deformation of the ball during the collision.

If the collision was perfectly elastic, it would bounce back to the same height, but KE is lost as you said. That "change of shape" line should get you thinking inelastic. Perfectly elastic means that it was at its original shape before and after the collision with no deforming whatsoever

## What is energy?

Energy is the ability to do work or cause change. It is present in all things and can take on many forms, such as mechanical, electrical, thermal, and chemical.

## How is energy measured?

Energy is measured in joules (J) or kilojoules (kJ). Other common units of energy include calories, kilocalories, and electron volts (eV).

## What is the difference between potential and kinetic energy?

Potential energy is energy that is stored and waiting to be released, such as a stretched rubber band. Kinetic energy is energy in motion, such as a moving car.

## What is the law of conservation of energy?

The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed from one form to another. This means the total amount of energy in a closed system remains constant.

## How do different sources of energy impact the environment?

Different sources of energy have varying impacts on the environment. Fossil fuels, such as coal and oil, contribute to air and water pollution and contribute to climate change. Renewable energy sources, such as solar and wind power, have much lower environmental impacts but may still have some negative effects on local ecosystems.

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