# P5 Flash cards

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• Created by: hatty101
• Created on: 24-04-14 00:38
Explain how centripetal force keeps bodies moving in a circle.
The force acts towards the centre of the circle and a force is acting on it all the time.
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Why do satellites orbit at different heights and have different orbital periods
Different satellites have different jobs so require different heights and closer they are to the earth, the faster they'll move due to the stronger gravitational force of attraction.
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What's the difference between vectors and scalars?
Scalar has magnitude only whilst vectors have magnitude and direction.
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Describe the horizontal and vertical motion of a projectile.
The horizontal velocity remains constant and the vertical velocity increases
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What's the only force acting on a projectile?
Gravity (Air resistance is ignored)
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How does gravity affect a projectile's vertical motion?
Gravity accelerates the projectile in the vertical direction.
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What is the principle of action and reaction between interacting bodies?
Action and reaction is a force that acts in pairs, are opposite in direction and are equal in magnitude.
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What are the wave patterns when plane waves pass through different sized gaps?
The smaller the size of a gap, the greater the diffraction.
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Describe interference in terms of reinforcement and cancellation.
Reinforcement occurs when the path difference between the two sources is a whole number of wavelengths and cancellation occurs when the path difference between the two sources is an odd number of half wavelengths.
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Describe polarisation of light.
Polarisation happens when light travels through a polarising filter, which only lets light waves through if they are vibrating in the correct plane
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Explain why refraction occurs.
Light waves change speed as pass across the boundary between two substances with different densities, such as air and glass so they change direction.
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Explain why dispersion occurs.
The different spectral colours travel at the same speed in a vacuum, but at different speeds in a medium such as glass.
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Describe the features of a convex lens.
A convex lens is thicker in the middle than it is at the edges.
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Describe the effect of a convex lens has on divergent beams of light
A diverging beam of light (one that spreads out) is also brought to a focus, but this is further away than the focal point.
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Describe the effect of a convex lens has on parellel beams of light
Light rays passing through the lens parallel to the principal axis are focused to a single point.
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Name three objects that use a convex lens.
Camera, magnifying glass, and a projector.
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## Other cards in this set

### Card 2

#### Front

Why do satellites orbit at different heights and have different orbital periods

#### Back

Different satellites have different jobs so require different heights and closer they are to the earth, the faster they'll move due to the stronger gravitational force of attraction.

### Card 3

#### Front

What's the difference between vectors and scalars?

### Card 4

#### Front

Describe the horizontal and vertical motion of a projectile.

### Card 5

#### Front

What's the only force acting on a projectile?