P1 - Energy Flashcards

1
Q

What is energy?

A

The capacity to do work.

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2
Q

What is the unit of energy?

A

Joule (J).

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3
Q

True or False: Energy can be created or destroyed.

A

False.

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4
Q

Fill in the blank: The principle of conservation of energy states that energy cannot be ______.

A

created or destroyed.

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5
Q

What is kinetic energy?

A

The energy an object possesses due to its motion.

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6
Q

What is the formula for kinetic energy?

A

KE = 1/2 mv², where m is mass and v is velocity.

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7
Q

What is potential energy?

A

The energy stored in an object due to its position or configuration.

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8
Q

What is gravitational potential energy?

A

The potential energy an object has due to its height above the ground.

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9
Q

What is the formula for gravitational potential energy?

A

PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

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10
Q

What is the relationship between work and energy?

A

Work done on an object results in a change in energy.

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11
Q

What is mechanical energy?

A

The sum of kinetic and potential energy in a system.

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12
Q

What is thermal energy?

A

The energy that comes from the temperature of matter.

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13
Q

True or False: All forms of energy can be converted into other forms.

A

True.

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14
Q

What is chemical energy?

A

The energy stored in the bonds of chemical compounds.

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15
Q

What is nuclear energy?

A

The energy stored in the nucleus of an atom.

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16
Q

What is electrical energy?

A

The energy caused by the movement of electrons.

17
Q

What is renewable energy?

A

Energy that is collected from resources that are naturally replenished.

18
Q

Give an example of a non-renewable energy source.

A

Fossil fuels (coal, oil, natural gas).

19
Q

What is efficiency in terms of energy?

A

The ratio of useful energy output to total energy input.

20
Q

What is the formula for efficiency?

A

Efficiency = (Useful Energy Output / Total Energy Input) x 100.

21
Q

What is energy transfer?

A

The movement of energy from one place or object to another.

22
Q

What is conduction?

A

The transfer of thermal energy through direct contact between materials.

23
Q

What is convection?

A

The transfer of thermal energy through the movement of fluids.

24
Q

What is radiation?

A

The transfer of energy through electromagnetic waves.

25
Q

What is a system in physics?

A

A set of interacting or interdependent components that form an integrated whole.

26
Q

What is the law of conservation of energy?

A

Energy cannot be created or destroyed, only transformed from one form to another.

27
Q

What is fossil fuel?

A

A natural fuel formed from the remains of ancient plants and animals.

28
Q

What is biomass energy?

A

Energy produced from organic materials, such as plant and animal waste.