O-LEVEL PHYSICS NOTES

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Flashcards covering key physics concepts from O-Level lecture notes.

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13 Terms

1
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What is the formula to determine density?

Density = mass/volume

2
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What unit is density measured in?

Kilogram per cubic meter (kg/m³) or grams per cubic centimeter (g/cm³)

3
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What is the principle of moments?

For an object in equilibrium, the total clockwise moment about any pivot equals the total anticlockwise moment.

4
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What does Ohm's Law state?

The current through a conductor between two points is directly proportional to the voltage across the two points, provided the temperature remains constant.

5
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What is an example of a use of electromagnetic induction?

Transformers, which are used to change voltage levels in an electric circuit.

6
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What is the difference between alternating current (AC) and direct current (DC)?

AC constantly changes direction, while DC flows in one direction only.

7
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What are the three types of radioactive decay?

Alpha, Beta, and Gamma decay.

8
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How does radiation affect living cells?

Radiation can damage or kill cells by ionizing atoms in the cell, which can lead to cancer or cell death.

9
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What does the half-life of a radioactive substance indicate?

The time required for half the quantity of a radioactive substance to decay.

10
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What is the total momentum before and after a collision in a closed system?

The total momentum is conserved; it remains the same before and after the collision.

11
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Why is static electricity useful in spray painting?

Charged droplets of paint are attracted to a grounded object, resulting in less wasted paint and a uniform finish.

12
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What is Earth’s gravitational pull approximately equal to?

10 N/kg.

13
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What is the role of neutrons in the nucleus of an atom?

Neutrons help stabilize the nucleus by reducing the repulsive forces between positively charged protons.