iGCSE Edexcel Physics Definitions Already Rated A+
1. Define acceleration and describe how it changes with time.
- Acceleration is the rate at which velocity changes over time.
2. Explain what air resistance (drag) is in the context of motion.
- Air resistance (drag) is the force that opposes the motion of objects moving through air.
3. What does alternating current (AC) refer to?
- Alternating current (AC) is an electric current that changes direction continuously.
4. What is the purpose of an ammeter?
- An ammeter is used to measure the magnitude of electric current flowing through a circuit, in units of
amps (A).
,5. Define the term 'amplified' in the context of electrical signals.
- Amplified refers to an increase in the size or power of electrical signals.
6. What does 'amp' signify in the realm of electric current?
- Amp is the unit of measurement for electric current.
7. Describe what analogue electrical signals are.
- Analogue electrical signals are voltage signals that vary continuously in value.
8. Explain the concept of the angle of incidence in optics.
- The angle of incidence is the angle between an incoming ray of light and the normal (perpendicular)
to a surface.
9. Define 'balanced' in the context of forces or charges.
, - Balanced refers to forces or charges that are equal in magnitude but opposite in direction, resulting
in a net sum of zero.
10. What is the unit 'Becquerel' used to measure?
- Becquerel measures the rate of radioactive decay per second.
11. Define 'braking distance' in the context of vehicle dynamics.
- Braking distance is the distance a vehicle travels after brakes are applied until it comes to a complete
stop.
12. What does 'cell mutation' refer to?
- Cell mutation denotes a change in the function or characteristics of a living cell, often caused by
factors like radiation.
1. Define acceleration and describe how it changes with time.
- Acceleration is the rate at which velocity changes over time.
2. Explain what air resistance (drag) is in the context of motion.
- Air resistance (drag) is the force that opposes the motion of objects moving through air.
3. What does alternating current (AC) refer to?
- Alternating current (AC) is an electric current that changes direction continuously.
4. What is the purpose of an ammeter?
- An ammeter is used to measure the magnitude of electric current flowing through a circuit, in units of
amps (A).
,5. Define the term 'amplified' in the context of electrical signals.
- Amplified refers to an increase in the size or power of electrical signals.
6. What does 'amp' signify in the realm of electric current?
- Amp is the unit of measurement for electric current.
7. Describe what analogue electrical signals are.
- Analogue electrical signals are voltage signals that vary continuously in value.
8. Explain the concept of the angle of incidence in optics.
- The angle of incidence is the angle between an incoming ray of light and the normal (perpendicular)
to a surface.
9. Define 'balanced' in the context of forces or charges.
, - Balanced refers to forces or charges that are equal in magnitude but opposite in direction, resulting
in a net sum of zero.
10. What is the unit 'Becquerel' used to measure?
- Becquerel measures the rate of radioactive decay per second.
11. Define 'braking distance' in the context of vehicle dynamics.
- Braking distance is the distance a vehicle travels after brakes are applied until it comes to a complete
stop.
12. What does 'cell mutation' refer to?
- Cell mutation denotes a change in the function or characteristics of a living cell, often caused by
factors like radiation.
