# P2.1,P2.2,P2.3,P2.4,P2.5

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What two things does a force arrow tell us?
Direction and magnitude of the force
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What does Hookes law state?
The extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.
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When an object falls through a liquid it will accelerate due to gravity, but what happens to the acceleration?
it reduces as the resistive forces increase.
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when a force makes an object move through a distance what is done to the object and what is it done against?
work is done against friction
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what is transferred when work is done?
energy
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describe what is meant by gravitational energy?
GPE is the energy that an object has by virtue of its position in a gravitational field.
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What is regenerative breaking?
a technique where the car will use the energy used in braking to help charge the generator
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what is the unit for momentum?
kg m/s
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what is the conservation of momentum?
momentum before is equal to the momentum afterwards
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explain how seatbelts and airbags stop serious injury in a car crash?
increase the time taken to stop, reducing the rate of charge of momentum and reducing injury
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Which part of an atom can move from object to object?
electrons
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how do objects become statically charged?
by rubbing together
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when 2 objects are rubbed together what charges do the objects become?
opposite
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if the object becomes positively charged what is lost?
electrons
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define current
the rate of flow of charge
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define potential difference
the amount of energy transferred per unit of charge
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How does a fuse work?
increased current causes atoms to vibrate, this increases resistance and temperature causing the wire to snap therefore breaking the circuit
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what is the unit for resistance?
ohms
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what can we say about the current in a series circuit?
the same at every point
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what can we say about the voltage in a series circuit?
shared equally across components if the resistance of those components is the same
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what can we say about the resistance in a series circuit?
total resistance is found by adding all resistors
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what can we say about the current in a parrallel circuit?
splits at a junction depending on the resistance of the components
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what can we say about the voltage in a parallel circuit?
the voltage across each component is the same as the supply voltage
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what can we say about the resistance in a parallel circuit?
overall resistance decreases as more resistors are added.
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Describe what is meant by frequency
number of waves passing a point in one second
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what is the name given to an atom that has lost or gained electrons
ion
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what causes ionisation?
when an element is hit with electrons causing it to lose an electron
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what is an isotope?
it has the same number of protons and a different number of neutrons
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when substances are unstable, what will they give out?
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radiation that usually comes from natural sources around us
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list some sources of background radiation
rocks,buildings,food,nuclear accidents
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what is an alpha particle?
it has 2 protons and 2 neutrons
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what is a beta particle?
it has a fast moving electron
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what material can stop alpha, beta and gamma radiation?
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what happens when alpha,beta and gamma travel through an electric field?
alpha and beta are deflected but gamma is not
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what is the half life?
time it takes for the radioactive material to lose half its mass. or time it takes to reduce the activity by half
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## Other cards in this set

### Card 2

#### Front

What does Hookes law state?

#### Back

The extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.

### Card 3

#### Front

When an object falls through a liquid it will accelerate due to gravity, but what happens to the acceleration?

### Card 4

#### Front

when a force makes an object move through a distance what is done to the object and what is it done against?

### Card 5

#### Front

what is transferred when work is done?