Energy Test Review

Front

What is the primary reason LEDs allow batteries in flashlights to last longer than traditional light bulbs?

Back

Less electrical energy is transformed into thermal energy as heat.

Front

When is the elastic energy in a dropped tennis ball greatest?

Back

Just before the ball starts to bounce upward.

Front

Define thermal energy.

Back

Thermal energy is the energy that comes from the temperature of matter. It is the total kinetic energy of the particles in an object.

Front

What is elastic energy?

Back

Elastic energy is the potential energy stored in an object when it is compressed or stretched.

Front

Explain the concept of energy transformation.

Back

Energy transformation is the process of changing energy from one form to another, such as electrical energy to light energy in a light bulb.

Front

What is the relationship between energy efficiency and heat production in light sources?

Back

Higher energy efficiency means less energy is wasted as heat, resulting in longer battery life and cooler operation.

Front

Describe how gravitational potential energy changes as an object falls.

Back

As an object falls, its gravitational potential energy decreases while its kinetic energy increases.

Front

What factors affect the bounce height of a tennis ball?

Back

The bounce height is affected by the ball's material, the surface it bounces on, and the height from which it is dropped.

Front

What is the formula for calculating gravitational potential energy?

Back

Gravitational potential energy (PE) = mass (m) × gravitational acceleration (g) × height (h).

Front

How does the size of a light source affect its energy consumption?

Back

Smaller light sources, like LEDs, typically consume less energy than larger, traditional light sources.