Energy Review

Which of the following demonstrates an airplane converting kinetic to potential energy?

• A. It ascends to a higher altitude.

• B. More passengers board the plane.

• C. It moves downward to make a landing.

• D. The wheels spin as it moves on the ground.

Sarah is sitting at the top of the slide in the school's playground. Which of the following changes will increase Sarah’s kinetic energy?

• An additional child is added to the top of the slide.

• Sarah is pushed and moves down the slide.

• Sarah climbs down the ladder and off the slide.

• The ladder is moved to the other side of the yard.

A diagram of a moving pendulum is provided. Which positions of the pendulum would have the most potential energy?

• A) 1 and 2

• B) 2 and 3

• C) 1 and 5

• D) 4 and 5

Tyler has learned that potential energy is energy stored. Tyler’s teacher asks the students to come up with a demonstration of potential energy. Which of the following would best work for this demonstration?

• A. A parked car in the driveway

• B. Wheels spinning on the ground

• C. A rock after it has been thrown

• D. A child at the top of a slide

Based on the chart, what conclusion can be drawn?

• The more mass that a rubber band has, the more difficult it is to move.

• The shorter the length of a rubber band, the less energy can be stored in it.

• The more potential energy put into a rubber band, the more kinetic energy is released.

• The farther a rubber band travels, the less it can be stretched later on.

Which position of the pendulum would have the least amount of potential energy?

• A. 1 and 5

• B. Only 3

• C. 2 and 4

• D. Only 5

Which of these best shows a change from potential to kinetic energy?

• A. Water flowing over a tall cliff

• B. A metal spring being stretched

• C. Electricity making a bulb light up

• D. A stone lying on top of a mountain

Ovens, toasters, dryers, and heat lamps are examples of inventions that convert electrical energy to thermal energy, which is a kind of kinetic energy. Which of the following does NOT demonstrate kinetic energy?

• A. Sound that traveled as a car passed by

• B. Waves of the ocean splashing on the seashore

• C. Electromagnetic energy that moves as waves

• D. Nuclear medicine applications, such as cancer treatments

Ryan is standing at the top of a hill, ready to throw a snowball. Which of the following changes will increase the kinetic energy of the snowball?

• A. Additional snow falls on the snowball, increasing its mass.

• B. The snowball is thrown down the hill, gaining speed.

• C. The weather warms and the snowball melts, decreasing its mass.

• D. The snowball is moved and now sits on a hill that is higher.

Energy is always conserved. It cannot be created or destroyed. It can, however, be transferred between objects or systems, from one form to another. Which of the following is true of the relationship between kinetic and potential energy?

• When a system loses kinetic energy, it loses potential energy.

• As kinetic energy decreases, potential energy decreases.

• When a system gains kinetic energy, it loses potential energy.

• As kinetic energy increases, potential energy increases.