conservation of energy

Which event is explained in the sequence of energy changes in the diagram below?

Chemical energy ===> Heat ====> Mechanical energy (with wasted heat)

• a blue spot light is on

• an electric fan rotates

• a runner doing stretches

• the battery-powered toy car runs forward

A combustion engine driving car loses most of it energy (75%) to heat. Is this energy loss or energy transformation?

• loss

• transformation

• neither

• both

At which point is potential energy greatest?

• W

• X

• Y

• Z

What is the unit of Potential Energy?

• m, mass

• kg, kilogram

• J, Joules

• m/s, meters/second

True or False - if a rock is thrown into the air, the increase in the height would increase the rock's kinetic energy, and then the increase in the velocity as it falls to the ground would increase its potential energy.

• True

• False

• Undetermined

A combustion engine driving car loses most of it energy (75%) to heat. Is this energy loss or energy transformation?

• loss

• transformation

• neither

• both

What is the correct energy transformation in a flashlight?

• electrical>mechanical>light

• mechanical>sound>electrical

• Chemical>light>electrical

• chemical>electrical>light

What is the correct energy transformation in a hot air balloon?

• Kinetic>mechanical>light

• Mechanical>sound>electrical

• Chemical>thermal>kinetic

• chemical>electrical>thermal

Which 2 letters have the most kinetic energy

• W & Y

• X & Z

This is they type of energy stored in a battery.

• Gravitational energy

• Elastic energy

• Nuclear energy

• Chemical energy