P5 Space for Reflection

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How long does it take a geostationary satellite to orbit the earth
24 hours.
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Polar orbiting satellites are used to help forecast the weather. Why are they used?
They view the whole earths surface.
2 of 40
Why does a satellite in polar orbit travel faster than a geostationary orbit?
The gravitational force is greater and there is a larger centripetal acceleration.
3 of 40
Describe how the speed of a comet changes during one orbit of the sun.
It speeds up on approach of the sun and slows down the farther away it gets.
4 of 40
What is the difference between a scalar quantity and a vector quantity?
A scalar has size only whereas a vector has size and direction.
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Give 5 examples of vectors.
Force, velocity, acceleration, momentum, and displacement.
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Give 5 examples of a scalar.
Length, volume, speed, mass and time.
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What are the optimum conditions for maximum diffraction?
If the gap is a similar size to the wavelength of the wave.
8 of 40
Explain the difference between microwaves and long-wave radio signals.
Microwaves have shorter wavelengths
9 of 40
Polaroid is used to make sunglasses. Describe how it reduces the amount of light reaching your eye.
Light waves vibrate in all directions at right angles to the wave direction; Polaroid only allows waves to vibrate in one direction.
10 of 40
Why can you not show polarisation of sound waves?
Sound is not a transverse wave and only transverse waves can be polarised.
11 of 40
Why do rainbows form?
Sunlight is made up of different colours each of which travels at a different speed. Each colour has a different refractive index.
12 of 40
Describe one use for optical fibres.
Endoscope; to see inside body without surgery
13 of 40
A convex lens is used as a magnifying glass. Explain how the image produced by a magnifying glass is different to the image produced by a projector.
Magnifying glass image is virtual, not real; cannot be projected onto a screen because no light passes through it, upright not inverted.
14 of 40
A _____ moves a a tangent and ___ makes it accelerate towards earth.
Satellite; Gravity.
15 of 40
The ____ the mass, the ___ the gravitational force.
Larger; Greater.
16 of 40
All geostationary satellites must be in the same orbit. Why can they not be too close together?
Their signals would overlap due to diffraction.
17 of 40
Speed in a particular direction is called ____.
Velocity.
18 of 40
The resultant of two forces that are not in the same straight line is found using the ______ _ _____.
Parallelogram of forces.
19 of 40
Define the symbols: U, V, A, S, T.
U: Initial Velocity, V: Final Velocity, A: Acceleration, S: Distance Travelled and T: Time Taken
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What is the equation to calculate Final Velocity?
v = u + at
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What is the equation to calculate distance travelled?
s = 1/2 (u + v)t
22 of 40
All bodies fall to earth under the affect of gravity. They accelerate at __m/s.
10.
23 of 40
A ball thrown horizontally from the top of the tower will fall to the ground at the same rate as a ball dropped from the top of the tower. The ___ of the ball thrown horizontally is ___.
Trajectory; Parabolic
24 of 40
What does trajectory mean?
The path of a projectile.
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What is a projectile?
Any object thrown or fired in the earths gravitational field.
26 of 40
The resultant velocity is the vector sum of the ____ _____ velocity and the ___ velocity.
Constant horizontal; Vertical.
27 of 40
What does momentum depend on?
Mass and Velocity.
28 of 40
Force=...
... rate of change of momentum.
29 of 40
As a rocket moves up, the hot gases released move ___. Momentum is ___.This means that the high momentum of the large massed rocket moving up is balanced by the high velocity of the exhaust gases.
Down; Conserved;
30 of 40
Light is polarised if the _____ are only in one direction at right angles to the wave direction.
Oscillations.
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What does destructive interference mean?
The waves are cut out of phase.
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What does constructive interference mean?
The waves meet in phase.
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What is the ionosphere?
It is the region between 100km and 500km above the earths surface.
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What is the aperture?
The size of the hole through which light enters a camera.
35 of 40
Magnification=...
Image size divided by object size.
36 of 40
The higher the refractive index of a material, the ___ its critical angle.
Lower.
37 of 40
Dispersion occurs because different colours have different speeds in a medium and have different refractive indexes. This means each colour has a different ___ __ ____.
Angle of refraction.
38 of 40
What sort of lens does a simple lens camera have and what does it produce?
It has a fixed lens which only produces a sharp image for one object distance.
39 of 40
What is the critical angle?
The angle of incidence for which the angle of refraction in 90 degrees; larger angles of incidence result in total internal reflection.
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Other cards in this set

Card 2

Front

Polar orbiting satellites are used to help forecast the weather. Why are they used?

Back

They view the whole earths surface.

Card 3

Front

Why does a satellite in polar orbit travel faster than a geostationary orbit?

Back

Preview of the front of card 3

Card 4

Front

Describe how the speed of a comet changes during one orbit of the sun.

Back

Preview of the front of card 4

Card 5

Front

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

Back

Preview of the front of card 5
View more cards

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