Global Challenges OCR Physics A

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10 Terms

1

Speed

The rate at which an object covers distance, calculated as distance traveled divided by time taken, typically measured in units like meters per second (m/s) or kilometers per hour (km/h).

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2

Acceleration

The rate of change of velocity of an object with respect to time, a vector quantity calculated as (final velocity - initial velocity) / time taken.

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3

Human Reaction Time

The delay between observation and action in humans, around 0.25 seconds, influencing driving and distance traveled during reaction time.

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4

Fossil Fuels

Derived from decomposed organic matter, non-renewable due to long formation timescales, used for generating thermal energy through combustion.

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5

Nuclear Fuels

Uranium and plutonium sources releasing energy through nuclear fission, with concerns about safety and waste disposal.

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6

Biofuels

Derived from organic materials, renewable and carbon-neutral, used for electricity generation.

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7

Red Shift

Phenomenon where light from an object moving away from an observer shifts towards longer wavelengths, indicating the expansion of the universe.

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8

Big Bang

Cosmological model suggesting the universe expanded from a high-density state, evolving over billions of years, supported by evidence like Red Shift and CMBR.

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9

Life Cycle of Star

Process starting from dust and gas clouds, leading to star formation, fusion of hydrogen to form helium, and eventual collapse into a white dwarf or supernova.

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10

Radiation Emission

Process of releasing energy in the form of waves or particles from a source, such as radioactive materials or electromagnetic sources.

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