# Unit 2

Unit 2 questions (mixed topics)

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- Created by: Taff6617
- Created on: 03-06-14 19:03

What is the difference between a scalar quantity and a vector quantity?

Vectors have magnitude and direction, while scalars only have magnitude

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Name a scalar quantity

Any of the following (or other as appropriate): distance, speed, mass, length, volume, density, area, pressure, power, energy, temperature

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Name a vector quantity

Any of the following (or other as appropriate): displacement, velocity, acceleration, force, weight, lift, drag

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State conditions for equlibrium

Balance forces; (and the principle of moments)

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What is the definition of a moment?

Moment of a force about a point is equal to the force x perpendicular distance between the pivot and line of action of the force

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What is the principle of moments?

(For equilibrium), the sum of the clockwise moments must equal the sum of the anti-clockwise moments (at any point)

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What is a couple?

A pair of equal and opposite forces acting on a body, but not at the same point

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What does a horizontal line mean on a velocity-time graph?

A constant velocity

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What does a line with a positive gradient mean on a velocity-time graph?

Acceleration

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What does a horizontal line mean on a distance-time graph?

No motion

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On a distance-time graph, it the line rises up, then lowers back to the x-axis, what has happened?

The object has returned to its original position

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On a distance-time graph, what does a straight line mean?

Constant velocity

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The value for acceleration due to gravity?

9.81ms^-2

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What is Newton's First Law?

Objects stay at rest or in uniform motion unless acted on by an external force

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What is Newton's Second Law?

F=ma (the force applied to an object is proportional to the mass and acceleration as a result of that force)

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What is terminal velocity?

The velocity of the object when the sum of the drag force equals the downward force of gravity acting on the object (acceleration = 0)

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What are Thinking, Breaking and Stopping distances?

(Thinking) distance traveled in the time it takes the driver to react; (Braking) distance traveled between when brakes are applied and when the vehicle stops; (stopping) breaking distance + thinking distance

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What is Hooke's law?

(Springs) Extension is proportional to force applied if elastic limit is not exceeded

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What is elastic limit?

Max. stress that can be applied without deformation

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What is Yield point?

A point where a noticeable change in length occurs due to a force

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What is breaking stress?

Max. stress a material can hold without breaking

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What is brittleness?

When a material can't extend without breaking (good for constant compression/force)

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What is a transverse wave?

A wave that has oscillations perpendicular to the direction of travel to the wave (think of a sine graph)

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What is a longitudinal wave?

A wave where the oscillations are in the same direction as travel of the wave

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What does the term 'in-phase' mean?

When 2 points are an integer number of wavelengths apart (oscillations are in time with each other)

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What is meant by the term 'anti-phase'?

When 2 points are 1/2 a wavelength apart

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What is polarisation?

When oscillations of the electric field of an EM wave are restricted to one plane/direction

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What is the principle of superposition?

The resultant displacement caused by 2 waves arriving at the same point is the vector sum of the 2 displacements caused by the waves at that instant

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What is a stationary wave?

A fixed pattern of vibration where no energy is transferred along the wave

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When are stationary waves formed?

When 2 continuous waves (of the same frequency) travel in opposite directions and superimpose

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On a stationary wave, what is a node?

A particle or point with no displacement/no amplitude

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What is the opposite of a node (and a definition)?

An anti-node (a particle/point with maximum displacement/amplitude)

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Name the album to feature refraction of light in a prism as the cover, and also the colour than 'bends' the least in refraction of visible light though a prism

Dark Side of the Moon (Pink Floyd) and red

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What is the refractive index of a vacuum?

1.00 (one)

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When does Total Internal Reflection occur (2 points please)?

(1) When the incidence substance has a higher r.i. than the other substance (2) when the angle of incidence is greater than the critical angle

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What pattern does the Young's double slit experiment produce?

A zebra crossing pattern - alternate light and dark spots

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In terms of diffraction, what happens if the slit is made narrower?

A larger diffraction effect/ pattern spreads out

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## Other cards in this set

### Card 2

#### Front

Name a scalar quantity

#### Back

Any of the following (or other as appropriate): distance, speed, mass, length, volume, density, area, pressure, power, energy, temperature

### Card 3

#### Front

Name a vector quantity

#### Back

### Card 4

#### Front

State conditions for equlibrium

#### Back

### Card 5

#### Front

What is the definition of a moment?

#### Back

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