Unit 4 Review

When an arrow is shot up in the air from a bow, when does it have only potential energy?

• when it is first released

• at its highest point

• when it hits the ground

• halfway up

What type of energy do the tires on a car have when they are rolling?

• potential

• kinetic

• chemical

• radiant

When riding a roller coaster, which energy transformation best describes the movement from the top of a hill to the bottom?

• kinetic to potential

• mechanical to kinetic

• potential to mechanical

• potential to kinetic

Which statement could apply to a scientific law?

• It is a theory created by scientists.

• It is easy to change.

• It is based only on a guess.

• It describes how the natural world behaves under certain circumstances.

Which statement could apply to a scientific theory?

• It is based on data and evidence.

• It is unable to change.

• It is based only on a guess.

• It is a law created by scientists.

How could a new discovery become a scientific theory?

• The idea would have to become a law first.

• It would have to be tested and retested by many different scientists.

• Scientists are smart, so it would just be accepted.

• It would have to be kept a secret so the idea wouldn't be stolen.

How is a law for society different from a scientific law?

• Scientific laws keep scientists safe in the lab.

• Scientific laws are always true and universal.

• Scientific laws can be broken.

• Scientific laws are hunches or guesses about the natural world.

How is a scientific theory different from a theory you have about why your favorite chips disappear faster than you eat them?

• Scientific theories cannot be investigated. You can investigate your theory.

• Scientific theories cannot be supported by evidence. You can support your theory with evidence.

• Scientific theories are hunches. Your theory is an educated guess.

• Scientific theories have been well investigated. Your theory is an untested idea.

How are scientific laws created?

• Data supports how the natural world works under certain circumstances.

• Scientists vote on them.

• Theories eventually become laws.

• Researchers agree about how the natural world works.

Why could a theory change over time?

• Laws used to be theories.

• New evidence is discovered.

• People become smarter over time.

• Because it is not fair.