Chapter 8 - Work and power - Part 1

At which position does the child on the swing have the most gravitational potential energy?

• W

• X

• Y

• Z

Elastic potential energy is energy stored in an object, such as a spring, due to the object being stretched or compressed. In which position is it most likely that the spring has lost its elastic potential energy?

• W

• Y

• X

• Z

All of the pictures are examples of what type of energy?

• gravitational potential energy

• elastic potential energy

• chemical potential energy

• kinetic potential energy

Long distance runners often eat special snacks partway through their run. What is most likely the reason for this?

• Their bodies do not convert chemical energy into motion energy very efficiently.

• They need to stay hydrated because they have sweated so much water out.

• They cannot eat before they run because it will make them sick.

• Much of the chemical energy in their bodies has been used up and must be replaced for them to continue working.

What kind of energy does an organism receive from eating food?

• electrical

• solar

• chemical

• mechanical

What is the energy transformation in photosynthesis?

• chemical to glucose

• thermal to chemical

• chemical to geothermal

• light energy to chemical

Which object shows an energy transformation from electrical to mechanical?

• 
• 
• 
• 

The faster an object moves, the ________ kinetic energy it has. 

• more
• less
• none of the above
• all of the above 

What would have the greatest kinetic energy?

• A car driving down a hill.
• A person running down a hill. 
• A ball rolling down a hill. 

The statement that "the energy within a system remains constant and cannot be created or destroyed, only transformed" best sums up _________.

• Something Mr. Lance likes to say.

• Life

• Law of Conservation of Energy

• The scientific method

• Newton's Third Law