Law of Conservation of Energy-Student Presentation 2025

Multiple Choice

The equation Energy_initial = Energy_final is a representation of which scientific law?

• Law of Conservation of Energy

• Newton's First Law

• Law of Universal Gravitation

• Law of Conservation of Mass

Fill in the Blanks

According to the law of conservation of energy, energy can't be ___ or ___; it can only be transformed from one form to another.

Multiple Choice

Which of the following statements best describes an isolated system in the context of energy conservation?

• A system where energy and matter cannot enter or leave.

• A system where only energy can enter or leave.

• A system where only matter can enter or leave.

• A system where both energy and matter can enter or leave.

Open Ended

Explain what happens to energy in open and closed systems when it is not conserved within the system.

Open Ended

Describe a real-life example where the law of conservation of energy can be observed, and explain how energy is transformed in that example.

Multiple Select

Which of the following are components of mechanical energy?

• Kinetic energy

• Potential energy

• Thermal energy

• Chemical energy

Multiple Choice

Which of the following is an example of energy transformation from chemical to motion energy?

• A person riding a bicycle after eating food

• A solar panel charging a battery

• A lamp lighting up from electricity

• A dam generating electricity

​https://florida.pbslearningmedia.org/resource/hew06.sci.phys.maf.rollercoaster/energy-in-a-roller-coaster-ride/

Multiple Select

Which of the following statements about the changes between kinetic and potential energy in a roller coaster is/are correct?

• At the highest point, potential energy is maximum and kinetic energy is minimum.

• At the lowest point, kinetic energy is maximum and potential energy is minimum.

• Mechanical energy is not conserved throughout the ride.

• Kinetic and potential energy are always equal at every point.

Multiple Choice

Why does the sum of kinetic energy and potential energy never exceed the initial mechanical energy in a roller coaster system?

• Because energy is lost as heat

• Because energy is created during the ride

• Because energy is conserved and only transformed between forms

• Because friction increases energy

​https://phet.colorado.edu/en/simulations/pendulum-lab

Fill in the Blanks

If the mechanical energy in the system were 50 Joules, and the kinetic energy in position #3 of the pendulum was 30 Joules, the potential energy at position #3 would be

Joules.

Open Ended

Explain how the conservation of energy applies to a water dam (reservoir), using the different labels to explain the transitions.

Multiple Choice

At which position on the roller coaster does the cart have maximum kinetic energy?

• At the top of the first hill

• At the lowest point of the track

• Halfway down the first hill

• At the end of the track

Fill in the Blanks

If the mechanical energy in the system were 50 Joules, what is the kinetic energy in position #3?

​Answer the following questions to the best of your ability. This is part of your grade!

Multiple Choice

Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly?

• Chemical to light
• Electrical to chemical
• Electrical to light
• Chemical to electrical

Multiple Choice

The picture shows a microwave oven. As a microwave oven is operated, electrical energy is transformed into all of the following types of energy EXCEPT —

• solar
• light
• thermal
• mechanical

Multiple Choice

In the absence of air resistance, what can be said about the total mechanical energy of a system?

• Remains constant

• Becomes zero at some point

• Increases over time

• Decreases over time

Multiple Choice

What is the relationship between potential energy and kinetic energy in a system?

• Potential energy is always greater than kinetic energy

• Potential energy and kinetic energy are completely unrelated

• Kinetic energy can never be converted into potential energy

• Potential energy can be converted into kinetic energy and vice versa

Multiple Choice

What is Mechanical Energy a sum of?

• Kinetic Energy and Thermal Energy

• Potential Energy and Chemical Energy

• Kinetic Energy and Potential Energy

• Thermal Energy and Chemical Energy

Multiple Choice

True or False

The total energy in an isolated system can be increased.

• true

• false

Fill in the Blanks

The sum of the kinetic and potential energy in a system is known as the system's total

energy.

Multiple Choice

A ball is suspended by a lightweight string, as shown in the figure.   The ball is displaced to position 1 and released. The four labelled positions are evenly spaced along the arc of the ball's motion.  
Between which adjacent pairs is the gain in kinetic energy the greatest?

• 1 and 2
• 2 and 3
• 3 and 4
• They are all equal

Multiple Choice

The law of conservation states that

• every action has an equal and opposite reaction
• all matter has thermal energy
• energy cannot be created or destroyed, only changes form
• heat moves from an object of higher temperature to an object of lower temperature

Multiple Choice

An acorn falls from a tree. Compare its kinetic energy KE to its gravitational potential energy PE.

• KE increases and PE decreases

• KE decreases and PE decreases

• KE increases and PE increases

• KE decreases and PE increases

• cannot be determined

Multiple Choice

Mechanical energy can be either potential or ________.

• Motion
• Kinetic
• Chemical
• Light

Multiple Choice

Which of the following devices directly transforms radiant energy into electrical energy?

• Solar panel

• Battery

• Lamp

• Wind turbine

Multiple Select

Which of the following are forms of energy produced in the city as a result of the reservoir system?

• Heat

• Light

• Mechanical Energy

• Sound

Multiple Choice

When electricity flows through a light bulb, which forms of energy are produced?

• Only light energy

• Only heat energy

• Both light and heat energy

• No energy is produced

Fill in the Blanks

The law of conservation of energy states that energy cannot be created or

.