IPC 5th 6 weeks test review

All objects in motion are said to have what kind of energy?

• potential energy

• chemical energy

• kinetic energy

• thermal energy

Students are assigned a laboratory activity during which they are asked to classify the types of energy present in various physical situations found around campus. Which of the following best represents a conclusion the students might include in their lab reports?

• All objects with kinetic energy can be found in high places.

• All objects with kinetic energy are moving.

• All objects with kinetic energy are microscopic.

• All objects with kinetic energy are hot.

Students are assigned a laboratory activity during which they are asked to classify the types of energy present in various physical situations found around campus. Which of the following objects or systems might be classified as having kinetic energy?

• a ball rolling in the gym

• an orange chemical in a beaker in the science lab

• a teacher walking down the hall

• a book on a tall shelf

Water flowing around rocks in a stream slowly erode the rocks over time. What is the best explanation of what is happening to the rocks?

• The water molecules' potential energy is used to break the rock and erode it.

• The water molecules' kinetic energy is used to break the rock and erode it.

• The water molecules make hydrogen bonds with the rock and break the interior bonds of the rock.

• The rocks undergo a chemical change and slowly disintegrate.

Which of the following shows no mechanical kinetic energy?

• A car moving down the street

• B rotating lawn sprinkler

• C cat chasing a mouse

• D a dog lying on the ground

A teacher provides the following data to her science students: 1. A 1.2 kg textbook on a 2.3 meter tall bookcase 2. A 74 kg student standing on the 3rd step of a stair case, 60 cm above the ground level 3. A 0.01 kg pencil on a desk top, 0.80 m above the floor 4. A 12 kg backpack on the roof of a 1-story house, 3.4 meters above the ground Rank these items from LOWEST gravitational potential energy to HIGHEST gravitational potential energy.

• 1, 2, 3, 4

• 2, 3, 4, 1

  
  

• 4, 3, 1, 2

  
  

• 3, 1, 4, 2

Why are mountain avalanches so dangerous and destructive?

• Because the falling rocks and snow have kinetic energy.

• Because the large potential energy from the extreme elevation and mass that can be transformed and transferred.

• Because of the elastic potential energy stored within the mountain.

• Because of the thermodynamics due to the extremely low temperatures at high elevations.

A pinball machine starts with a pulled back spring that starts the ball moving each turn. What type of energy is given to the spring when pulled back?

• Gravitational Potential Energy

• Elastic Potential Energy

• Kinetic Energy

• Chemical Energy

How does snapping a rubber band relate to mechanical energy?

• The rubber band transforms itself into kinetic energy.

• The rubber band has elastic potential energy stored in it when pulled back.

• The rubber band has gravitational potential energy stored in it when pulled back.

• The rubber band has kinetic energy stored in it when pulled back.

Why do most roller coasters start by slowly taking the roller coaster carts up a very tall hill?

• To maximize the kinetic energy at the beginning of the ride.

• To maximize the gravitational potential energy at the beginning of the ride.

• To equalize the gravitational potential energy at the beginning of the ride with the kinetic energy.

• This is actually a safety feature that is unrelated to the energy of the ride.