# Physics

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What are compressions?
The area where the lines are closer together
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Compare the movement of vibrations/particles in transverse and longitudinal waves
Longitudinal - particles/vibrations move in the same direction as wave movement. Transverse - particles/ vibrations are perpendicular to the direction of wave movement.
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What are three advantages of using electrostatics for paint spraying?
Finer spray, and even coat, less waste
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If there is very little air resistance, the projectile path is very predictable. Name the shape of this path.
Parabola
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In a projectile, how does the force of gravity affect the horizontal velocity of the object?
No effect by gravity.
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In a projectile, how does the force of gravity affect the vertical velocity of the object?
The vertical velocity decreases.
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In a projectile, how does the force of gravity affect the acceleration?
The acceleration remains constant.
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What is meant by a geostationary orbit?
The satellite orbits in 24 hours above a fixed point on the equator.
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Why is a geostationary orbit chosen for satellites transmitting TV signals?
The transmitter point in the same fixed position, providing a constant line of sight.
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What is the time of a low polar orbit?
90 minutes
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Compare the speeds of a low polar orbit and a geostationary orbit. Explain this difference using ideas about forces.
A low polar orbit is faster than a geostationary orbit. This is because the attraction of gravitational force is stronger, as it is closer to Earth. Centripetal force needs to be bigger at lower altitudes
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How does Huygen's wave model explain the reflection of light?
Angle of incidence = angle of reflection
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What is constructive interference?
Where the crest and trough of a wave are in phase.
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What is destructive interference?
Where the crest and trough of a wave are out of phase.
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In an LDR, what causes the resistance to change, and how does it change.
The resistance decreases as the light levels increase.
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In a thermistor, what causes the resistance to change, and how does it change?
The resistance decreases as the temperature increases.
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Why does the current pass through this diode (look at diagram)?
The current is in the correct direction for the diode. When the voltage is positive, there is low resistance.
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Define current.
The flow of charge carriers called electrons.
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How can the same motor be made to have different speed settings?
By using a variable resistor.
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What are rarefractions?
The area where the lines are further apart. This region has a lower pressure.
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How can ultrasound be used to treat a patient with kidney stones?
High power ultrasound beam passes into body directed at kidney stones. Ultrasound causes vibrations in stones which breaks them down into smaller pieces. Tiny pieces excreted normally.
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How do scientists stop nuclear fission reactions going out of control?
By placing metal rods in the reactor, which absorb some of the neutrons. There are now less neutrons to react with.
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Nuclei of hydrogen isotopes undergo fission to form what kind of nuclei?
Helium
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How do anti-static sprays work?
They leave a conducting layer so that charge cannot build up.
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How does heating a thermistor affect the brightness of a lamp?
The resistance decreases therefore the brightness of the lamp increases.
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When resistors are connected in series, how do you calculate the total resistance?
The sum of their individual resistance.
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When resistors are connected in parallel, how do you calculate the total resistance?
The sum of the reciprocal of their individual resistance.
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How do you calculate the current flowing from any of these points?
All three points add up to 1
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Looking at this graph, what component is being used?
Diode.
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What effect does a capacitator have on a DC output?
It smooths the output
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What are difficulties for a manufacturer making very small components for a satellite?
Must be robust. Must be reliable ( if it breaks in space it cannot be easily repaired), and must be able to withstand large variations of temperature in space.
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## Other cards in this set

### Card 2

#### Front

Compare the movement of vibrations/particles in transverse and longitudinal waves

#### Back

Longitudinal - particles/vibrations move in the same direction as wave movement. Transverse - particles/ vibrations are perpendicular to the direction of wave movement.

### Card 3

#### Front

What are three advantages of using electrostatics for paint spraying?

### Card 4

#### Front

If there is very little air resistance, the projectile path is very predictable. Name the shape of this path.

### Card 5

#### Front

In a projectile, how does the force of gravity affect the horizontal velocity of the object?