Like pole (N-N or S-S) repel
Unlike poles (N-S or S-N) attract
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What does a permanent magnet do?
It produces a magnetic field
The magnetic field cannot be turned on and off
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What does a Induced magnet do?
They are attracted by other magnets, they are not repelled
They lose most or all their magnetism when they are removed from the magnetic field
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How can you test for magnetism?
Attract or repel another permanent magnet
Attract a magnetic material (but not repel it)
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Magnetic field line.
The magnetic field lines never cross each other
The closer the lines the stronger the magnetic field
The lines have arrow heads to shoe the direction of the force
The arrowheads point from the north pole of the magnet to its south pole
What are the 2 types of charge?
(With a defintion)
Direct: The flow of electrons is consistently is on direction in the circuit
Alternating: The flow of electrons direction continually reverses
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What is charge?
Charge is where an object experiences a force in an electric field. Charge is measured in coulombs (C)
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What is the equation for current?
Q = I x t
Charge = Current x Time
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How do you measure potential difference?
You can measure potential difference in a circuit by placing a voltmeter parallel with a component (lamp) in order to measure the difference of energy from one side of the component to the other
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What is the potential difference equation?
V = E/Q
Potential difference = Energy/Charge
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What are Scalar quantities?
Scalar quantities only have a magnitude or size
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Give some examples of scalar quantities
Temperature: Degrees Celsius
Mass: Kilograms
Energy: Joules
Distance: Metres
Speed: Metres per second
Density: Kilogram per metre cubed
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What are vector quantities?
Vector quantities have a magnitude and an associated direction
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Give examples of vector quantities
Force: Newtons to the left
Displacement: Kilometres east
Velocity: Metres per second upwards
Acceleration: Metres per second squared downwards
Momentum: Kilogram metres per second south west
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What is a contact force?
A contact force is a force that happens between 2 objects that a physically touching each other
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Examples of a contact force are?
Reaction force (A book on a table)
Tension (A cable holding a ceiling lamp)
Friction (A box sliding down a slope)
Air resistance (A skydiver falling through the air)
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What is a non-contact force?
A non-contact force are forces that happen between 2 objects that are not physically touching each other
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Examples of non-contact forces are?
Magnetic force
Electrostatic force
Gravitational force
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What is Newtons 1st law?
An object remains in the same state of motion unless a resultant force (The single force that could replace all the forces acting on an object) acts on it
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What is Newtons 2nd law?
Force, mass and acceleration
resultant force = mass x acceleration
F = m a
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What is Newtons 3rd law?
When 2 objects interact, they exert equal and opposite forces on each other
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What can effect braking distance of a car?
Poor road and weather conditions (wet or icy roads)
Poor vehicle conditions (worn brakes or worn tyres)
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What happens when a force is applied to the brakes of a vehicle?
There is work done (the amount of energy it takes to do a task) by the friction between the brakes and the wheel. This reduces the kinetic energy of the vehicle.
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What is the equation for momentum?
p = m v
Momentum = mass x velocity
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Other cards in this set
Card 2
Front
In what ways to magnets attract or repel?
Back
Like pole (N-N or S-S) repel
Unlike poles (N-S or S-N) attract
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