# Physics

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How do you work out speed?
Distance traveled divided by time taken
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How do you work out distance?
(initial speed plus final speed) divided by two. Then average speed x time
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How do you work out acceleration?
Change in speed divided by time taken for change
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How do you work out resultant force?
mass x acceleration
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How do you work out the stopping distance?
thinking distance + braking distance
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How do you work out weight?
mass x gravitational field
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How do you work out the amount of work done?
force applied x distance moved in direction of force
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How do you work out the amount of power?
force x velocity
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How do you work out the kinetic energy?
1/2 x mass(kg) x speed
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What is terminal velocity?
When the opposing forces are equal
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What are the units of temperature and heat energy?
Degrees, Celsius and joules
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How do you work out the gravitational potential energy?
mass (kg) x gravitational field strength(metres N/KG) x change in height
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What does terminal speed mean?
When the object has reached the fastest speed it can and will no longer increase
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What is a precipitator?
fitted to chimneys in factories and power stations. They remove most of the dust and soot from the smoke that passes through.
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What is resistance?
What prevents the electrons that flow around in a current
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What is electricity?
The electrons that flow round in a current
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What is a fixed resistor?
Constant resistance, the bigger the resistance the smaller the current that flows for a particular voltage.
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What is a variable resistor?
(rheostat) has a changeable resistance e.g speaker or oven
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What type of particles have a helium nucleus?
Alpha particle
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What type or particle have a fast moving electron?
Beta particle
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What type of wave is gamma?
electromagnetic wave
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What is the order of increasing frequency in electromagnetic waves?
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What is the ionosphere?
Defined as the layer of the earths atmosphere that is ionized by solar and cosmic radiation
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What is the nature of alpha-particles?
Positive particle with helium nucleus. about 7,000 times the mass of an electron
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What is the nature of beta-particles?
negative electron
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What is the nature of gamma-rays?
electromagnetic waves, short wave length.
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What particles are affected by electric and magnetic fields?
Alpha-particles and beta-particles
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How much penetration is able to occur in the three types of particles?
Alpha: stopped by paper or skin (or 6cm of air) Beta: stopped by 3mm of aluminium Gamma: reduced but not stopped by lead
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What are the speeds of the 3 types of particles?
alpha: 10% speed of light beta: 50% speed of light gamma-ray: speed of light
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## Other cards in this set

### Card 2

#### Front

How do you work out distance?

#### Back

(initial speed plus final speed) divided by two. Then average speed x time

### Card 3

#### Front

How do you work out acceleration?

### Card 4

#### Front

How do you work out resultant force?

### Card 5

#### Front

How do you work out the stopping distance?