Physics- white and pink random cards

• Created by: emj790
• Created on: 25-01-17 19:08
What is acceleration?
The change in velocity in a certain amount of time
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What does uniform acceleration mean?
Speeding up or slowing down at a constant rate (constant acceleration)
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What does a distance/ time graph tell you?
How far something has travelled over time
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In a distance/ time graph: what does the flat section mean?
It is stationary
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In a distance/ time graph: what does the gradient show?
The speed of the object at that time
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In a distance/ time graph: what do the curves represent?
Acceleration
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In a distance/ time graph: what does a steeper curve mean? (If it gets steeper)
It means it's speeding up
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In a distance/ time graph: what does a levelling off curve mean?
It's slowing down
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In a distance/time graph: what do you do to find the speed on a curve?
Draw a tangent and then find the gradient
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In a velocity/ time graph what does the gradient represent?
Acceleration
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In a velocity/ time graph: what does the flat section represent?
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In a velocity/ time graph: what happens as the graph gets steeper?
The acceleration and deceleration get greater
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In a velocity/ time graph: what does a curve mean?
Changing acceleration
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In a velocity/ time graph: how do you work out the distance travelled?
You find the area
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What can you do to increase momentum?(2 things)
Increase mass and increase velocity
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What is the conservation of momentum?
Where the total momentum before an event is the same as after the event
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What is stopping distance made of?
Thinking distance and braking distance
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What is thinking distance?
The distance the car travels in the driver's reaction time
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What affects thinking distance? (2 factors)
Your reaction time and your speed (the further you will travel in your reaction time)
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What increases your reaction time? (Name as many as you can)
Tiredness, alcohol, drugs, and any distractions
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What is braking distance?
The distance taken to stop once the brakes have been applied
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What can affect the braking distance?
Your speed, the mass, condition of the brakes and friction (surface)
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In nuclear fission- what is the form of most of the energy in?
Kinetic energy
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In nuclear fusion and fission:Why do both the daughter nuclei and the nuclei have alot of kinetic energy?
They are moving at high speeds
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What is ionising radiation?
It is radiation that has enough energy to cause atoms to lose electrons and become ions
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How does an atom become an ion?
It gains a charge (different number of electrons to protons)
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In lithium-6, what is the number indicating?
That the relative atomic mass is 6
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What is an isotope?
An atom that has the same number of protons but a different number of neutrons
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What do you call the particles in the nucleus?
Nucleons
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Where can you find protons and neutrons?
In the nucleus
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What are the types of ionising radiation?
Alpha particles, Beta particles, Gamma rays
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What type of energy do gamma rays have?
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What type of energy does Alpha and Beta have?
Kinetic energy
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What is penetration ability based on?
Size, smaller is better
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What is ionising ability based on?
Size, bigger is better
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What are gamma rays?
A high- frequency electromagnetic have emitted by some unstable nuclei
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What can gamma be stopped by?
A few centimetres of lead or absorbed by many metres of concrete
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What is the charge of gamma rays?
It has no charge
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How fast do gamma rays travel?
At the speed of light
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What is the symbol of gamma? (decribe or draw)
A v with a loop in the bottom/ upside down fish
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What is the symbol of Beta?
A B with an elongated tail
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What is the symbol of Alpha?
A fish
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What is the charge of Beta?
-1
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What can Beta particles be stopped by?
A few millimetres of aluminium
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What is the penetration ability order? (most to least)
Gamma, Beta, Alpha
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What is the ionising ability order for alpha, beta and gamma? (most to least)
Alpha, Beta, Gamma
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What are beta particles? (Structure)
Electrons that are emitted from an unstable nucleus
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What is Alpha stopped by?
A few centimetres of air or a few millimetres of paper
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What do alpha particles have such a short penetration distance?
They produce many ions in a short distance which means that they lose energy quickly
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What happens to an Alpha particle after they ionise an atom?
They lose some energy
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What is the charge of an alpha particle?
+2
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What is an Alpha particle similar to?
The nucleus of a helium atom
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What do Alpha particles not have (in terms of sub-atomic particles)?
Electrons
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What do Alpha particles contain?
Two protons and two neutrons
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Why can't you predict when a nucleus will decay?
It's a random process
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How is ionising radiation produced?
From a decaying nucleus
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What does the unstable nucleus need to do to become more stable?
It decays by losing energy when certain types of ionising radiation are emitted from the nucleus
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What does a radioactive substance have?
An unstable nucleus
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Other cards in this set

Card 2

Front

What does uniform acceleration mean?

Back

Speeding up or slowing down at a constant rate (constant acceleration)

Card 3

Front

What does a distance/ time graph tell you?

Back Card 4

Front

In a distance/ time graph: what does the flat section mean?

Back Card 5

Front

In a distance/ time graph: what does the gradient show?

Back 