# P2

P2

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What is the difference between Speed and Velocity?
Speed is just how fast you're going, where velocity must have a direction specified (e.g. 30mph North)
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What do straight or uphill section mean on a Distance-Time Graph?
The object is moving at a steady speed
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What is the equation for Acceleration?
Acceleration = Change in Velocity divided by Time Taken
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On a Velocity time graph what does gradient equal and how do you work out gradient?
Acceleration and Vertical change divided by horizontal change.
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What is the difference between weight and mass?
Weight(N) is caused by the pull of gravity and mass is the amount of stuff in an object.
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What's the formula for weight?
Mass x Gravitational field strength
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What does it mean if a still object has no resultant force?
The forces acting both ways on an object, meaning it will remain stationary.
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What happens to the forces when to objects interact?
The forces they exert on each other are equal and opposite.
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What is meant by terminal velocity?
The maximum speed of an object.
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What are the two main factors that affect your thinking distance?
How fast you're going (Depending on your reaction times) and State of mind ( tiredness, drugs and alcohol).
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What are three things that affect your braking distance?
How good your brakes are, how much grip your tyres have and how fast you're going,
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What is the formula for Work done?
Work done = Force x Distance
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What is gravitation potential energy?
The energy that an object has because of its vertical position in the gravitational field (how high it is)
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What is the equation for kinetic energy?
1/2 x Mass x speed squared
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What makes a machine powerful?
It transfers a lot of energy in a short space of time.
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What two things increase the momentum of an object?
Greater mass and greater velocity.
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Name three things which make a car safer.
They have seatbelts, they have air bags and they have crumple zones.
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What is static electricity?
Static electricity is charges which are not free to move, build up in one place and when they finally move it ends in a spark.
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What is the name for a material that charges can easily move through?
Conductors.
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What is potential difference?
The driving force which pushes the current around a circuit.
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How are the components connected in a parallel circuit?
Each component is separately connected to the +ve and -ve of the supply.
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What is the voltage of the mains in the U.K and is it AC or DC?
230 volts and AC at 50Hz (cycles a second).
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What are the three wires in a plug?
Live wire (brown), Neutral wire (blue) and the Earth wire ( green and yellow).
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How does a Earth wire work?
If the live wires touches the metal case, too great a current flows through the live wire, through the case and down the Earth wire.
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What are the 3 subatomic particles in the atom?
Neutron, proton and electron.
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Number of protons equals...?
Number of electrons so they is no overall charge.
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What is an isotope?
A atom with the same number of protons but different number of neutrons.
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ame the 3 types of radiation.
Alpha particles, beta partciles and gamma rays
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What are Alpha particles made of?
2 protons and 2 neutrons (helium nuclei)
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What sort of waves are Gamma rays?
Electro magnetic waves.
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Which of the types of radiation can penetrate further and is less ionising?
Gamma Rays.
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What is half life?
Half life is the average time it takes for the number of nuclei in a radioactive isotope sample to halve.
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What is ionisation?
Alhpha, beta and gamma radiation enters cells and collides with molecules, destroying the molecules.
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What is the process of making fuel by splitting big atomic nuclei?
nuclear fission.
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What is the process of making fuel from colliding small atomic nuclei?
Nuclear fusion.
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How do stars form?
The force of gravity brings together clouds of dust and gas which start to spin (called a protostar).
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A star in the stable part of its life is called what?
Main sequence star.
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What happens to star much bigger than our sun after its main sequence stage?
It expands to a red super giant, supernova, neutron star or black hole.
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What happens to a star similar/smaller than our sun?
Red giant, then white dwarf.
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## Other cards in this set

### Card 2

#### Front

What do straight or uphill section mean on a Distance-Time Graph?

#### Back

The object is moving at a steady speed

### Card 3

#### Front

What is the equation for Acceleration?

### Card 4

#### Front

On a Velocity time graph what does gradient equal and how do you work out gradient?

### Card 5

#### Front

What is the difference between weight and mass?