# Actual P2!!!!!!!!!!!!!

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What is the difference between velocity and speed?
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 do straight or uphill sections mean on a velocity time graph?
Acceleration.
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whats the difference between mass and weight?
Weight is caused by the pull of gravity and mass is the amount of stuff inside an object.
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Formula for weight is?
Mass x gravitational field strength.
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What is resultant force?
The overall force on a point or an object.
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What happens to an object if there is a resultant force?
Its velocity changes.
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What happens if there is no resultant force on a moving object?
Carry on moving at the same velocity.
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What happens to the forces when two objects interact?
They exert the force equally and in the opposite direction.
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Resultant force =
Mass x acceleration.
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What is terminal velocity?
The maximum speed of an object.
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Why do objects reach terminal velocity?
As the acceleration increases the friction also increases, this decreases the acceleration and they eventually become equal.
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List 2 things that effect your thinking distance.
State of mind e.g. drugs, alcohol, tiredness and how fast you are.
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List 3 things that effect your braking distance.
Weather conditions, how good your brakes are and how fast you are going.
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What is work done?
When a force moves an object through a distance, energy is transferred and work is done.
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What is the equation for Work done?
Force x Distance.
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What is gravitational potential energy?
The amount of energy an object has due to its position in the gravitational field (how high up it is).
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What is the gravitational field strength on Earth?
10N/Kg
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What two things effect kinetic energy?
Mass and Speed (faster and heavier increases kinetic energy).
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What two ways can kinetic energy be lost?
Heat and sound
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What is an elastic object?
An object that can go back to its original shape after the force has been removed.
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What happens to an elastic object after the force has been removed (in terms on energy).
The elastic potential energy is converted to kinetic energy.
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what is the formula for elastic energy?
F = K x e ( force = spring constant x extension of the spring).
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What is power and what is it measured in?
The rate of work ( usually a second) and measured in watts.
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What is a watt?
One watt = 1 joule of energy transferred per second.
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Momentum =
Mass x velocity
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What two things effect momentum?
Mass and velocity (increase mass and velocity increases momentum).
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Name three things a car has which are safety features.
Crumple zone, seatbelt and airbags.
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What is static electricity?
When electrons are not free to move and build up over time, when they can eventually move the spark.
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What happens to the polythene rod and a acetate rod when they are rubbed with a duster?
polythene rod becomes negatively charged (electrons from duster) and acetate rod's electrons move on to the duster.
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What is resistance?
Anything in a circuit that slows the current.
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What is potential difference and what is the unit?
Driving force that pushes the current, measured in volts.
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What happens in a resistor?
It changes some electrical energy to heat energy which causes the ions in the conductor to vibrate more so currenct cant flow as easily
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What is a LDR?
A light dependant resistor that depends on the intensity of the light.
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What it the difference between a series circuit and a parallel circuit?
In a series circuit the components are connected in a line and in parallel the components are separately connected to the power.
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What is the voltage and frequency of the mains electricity?
230V and 50Hz
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Name three electrical hazards.
Water near electrical appliances, Frayed cables, long cables, too many plugs in one socket, no covers on appliances.
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Name the three wires and there colours
Live - brown, neutral - blue and earth - yellow and green
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How does an earth wire work?
Live wire touches the metal case, because its earthed, too greater current flows through the live wire, through the case and then down the earth wire.
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energy transfered (in an appliance) =
Power(watts) x time(seconds).
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What is an isotope?
Atoms of an element with the same number of protons and different number of neutrons.
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Give 2 examples of man made background radiation.
X rays and nuclear waste
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Describe an aplha particle.
2 protons and 2 neutrons, a helium nucleus which is highly ionising by cant penetrate very far.
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Why are beta particles emitted?
nucleus has too many neutrons and changes one of them into a proton and an electron, electron is released.
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What is half life?
The average time it takes for the number of nuclei in a radioactive isotope sample to halve.
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How do you work out half life?
Keep halving the given cpm till you get to the cpm of it now after, count how many halves you did, time divided by amount of halves.
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Whats the difference between nuclear fission and nuclear fusion?
fusion is joining of small atomic nuclei and fission is breaking up of large atomic nuclei.
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What happens to a star larger than our sun after its main sequence stage?
supernova, super red giant, neutron star or black hole.
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What happens to a star like our sun or smaller after its main sequence stage?
Red giant, white dwarf.
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What is Thinking distance?
The distance the vehicle travels during the drivers reaction time.
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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 do straight or uphill sections mean on a velocity time graph?

### Card 4

#### Front

whats the difference between mass and weight?

### Card 5

#### Front

Formula for weight is?