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Physics Edexcel GCSE higher triple > Definitions > Flashcards

Definitions Flashcards

1
Q

What is a wave?

A

A wave can transfer energy without transferring matter

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2
Q

What is a wavefront?

A

The peaks of transverse waves
The compressions of a longitudinal wave
Used to illustrate wave motion

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3
Q

Giga- (G)

A

x10^9

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4
Q

Mega- (M)

A

x10^6

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5
Q

Kilo- (k)

A

x10^3

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6
Q

Centi- (c)

A

x10^-2

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7
Q

Milli- (m)

A

x10^-3

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8
Q

Micro- (µ)

A

x10^-6

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9
Q

Nano- (n)

A

x10^-9

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10
Q

Describe the process of terminal velocity

A

Weight acts downwards
Drag acts upwards
Person accelerates downwards
Eventually weight = drag
No resultant force, no acceleration, forces are balanced
Terminal velocity (constant velocity) is reached

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11
Q

What is stopping distance?

A

The distance travelled by a vehicle after a hazard has been spotted until it comes to a complete rest (thinking distance + braking distance)

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12
Q

What factors affect braking distance?

A

Condition of road, tyres and breaks

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13
Q

What factors affect thinking distance?

A

Tiredness, drink and drugs

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14
Q

What is conservation of energy?

A

Energy cannot be created or destroyed, it can only be converted from one form into another

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15
Q

Describe the changes in the way energy is stored when an object is projected upwards

A

KE —> GPE

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16
Q

Describe the changes in the way energy is stored when a moving object hits an obstacle

A

KE of object —> KE in obstacle —> heat energy and sound energy

17
Q

Infrasound

A

Below human hearing (20Hz)

18
Q

Ultrasound

A

Above human hearing (20,000Hz)

19
Q

How do optical fibres work

A

Total internal reflection
Core of fibre made of glass with high refractive index
Classing is made of glass with lower refractive index
Light entering core is at an angle greater than the critical angle so light is TIR

20
Q

Examples of optical fibres

A

Endoscope - used in keyhole surgery
Communication as less energy is lost when compared to using copper wiring

21
Q

Electromagnetic spectrum

A

Radio waves, microwaves, infrared, visible light, UV, X-ray, gamma ray

Physics Edexcel GCSE higher triple (2 decks)

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