Unit 5 Energy Review

Which statement best describes the law of conservation of energy?

• Energy cannot be created or destroyed.

• The conservation of energy is unrelated to the conversion of energy.

• We need to conserve our natural resources.

• Energy can be destroyed but not created.

Light waves from the sun can be converted to electricity through __________.

• a solar cell

• a hydroelectric dam

• the process of fission

• an electric heater

Which of the following is the best definition of energy?

• the ability to produce fusion

• the ability to generate electricity

• the ability to generate heat

• the ability to do work

The energy of motion best describes which of the following?

• potential energy

• the energy of an electrical charge

• kinetic energy

• the energy of fusion

Which of the following is the best example of potential energy?

• a ball sitting at the bottom of a hill

• a ball rolling down a hill

• a ball sitting at the top of a hill

Which of the following is an example of kinetic energy?

• a car sitting motionless

• a sled sitting at the top of a hill

• a tank containing gasoline

• a girl running in a race

If the atoms and molecules of a substance are moving very fast, the substance is __________.

• frozen

• cold

• hot

• porous

A ball falling through the air has___________.

• both potential energy because it still has a distance to move before it hits the ground and kinetic energy because it is moving

• only potential energy

• both kinetic energy because it still has a distance to move before it hits the ground and potential energy because it is moving

• only kinetic energy

A 0.40 kilogram bird is flying at a constant speed of 8.0 m/s. What is the bird's kinetic energy ?

• 3.2 J
• 4.2 J
• 2.0 J
• 12.8 J

Tags

CCSS.8.EE.A.2

A 60.0 kg person walks from the ground to the roof of a 74.8 m tall building. How much gravitational potential energy does she have at the top of the building?

• 43982.4 J
• 63982.3 J
• 43962.4 J
• 83942.4 J

Tags

NGSS.MS-PS3-2