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Unit 1: Energy
1.2 Conservation and Dissipation of Energy
1.2.1 Principle of Conservation of Energy
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Cards (28)
A falling object converts kinetic energy to gravitational potential energy as it rises.
False
Match the mechanical system with its energy transformations:
Pendulum ↔️ Kinetic to gravitational potential
Bouncing Ball ↔️ Kinetic to elastic potential
Roller Coaster ↔️ Gravitational to kinetic
A closed system is isolated from its
surroundings
An open system allows energy to flow in and out of it.
True
Steps in the principle of conservation of energy
1️⃣ Energy cannot be created
2️⃣ Energy cannot be destroyed
3️⃣ Energy can only be transformed
4️⃣ Total energy in a closed system remains constant
Match the mechanical system with its energy transformation:
Pendulum ↔️ Kinetic to gravitational potential energy
Bouncing Ball ↔️ Kinetic to elastic potential energy
A closed system is isolated from its surroundings and conserves energy
internally
.
True
What happens to the total energy in a closed system if no energy is exchanged with the surroundings?
It remains constant
When lifting a book, you give it gravitational potential
energy
In a closed system, energy is conserved within the
system
What is a closed system in terms of energy exchange?
No energy exchange
Match the system type with its characteristic:
Open System ↔️ Energy can flow in and out
Closed System ↔️ Energy is conserved within the system
Energy can be transformed into forms such as kinetic, potential, thermal, and
electrical
What type of energy is gained when you lift a book?
Gravitational potential energy
What type of energy does a roller coaster gain as it climbs uphill?
Gravitational potential energy
Match the mechanical system with its energy transformation:
Pendulum ↔️ Kinetic to gravitational potential
Bouncing Ball ↔️ Gravitational potential to elastic potential
Match the system type with its example:
Open System ↔️ Car engine
Closed System ↔️ Sealed thermos
Energy can only be transformed into kinetic, potential, thermal, and
electrical
forms.
True
The principle of conservation of energy states that energy cannot be created or
destroyed
The total energy in a closed system remains constant during energy transformations.
True
An open system allows
energy
to flow in and out of the system.
True
In a closed system, energy is
conserved
What is an example of a closed system mentioned in the material?
Pendulum
A falling object demonstrates the conversion of kinetic energy to gravitational potential energy.
True
In mechanical systems, energy is transformed between kinetic and
potential
In mechanical systems, energy transformations demonstrate the principle of conservation of
energy
What happens to the total energy of a system when a roller coaster descends a hill?
It remains constant
Energy is neither created nor destroyed, but
transformed