physics

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what is a scalar quantities
only have a magnitude
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what is a vector quantities
have a magnitude and direction
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what is an example of a scalar quantities
mass
volume
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what is an example of a vector quantities
acceleration
velocity
force
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how do you represent a vector quantities
its represented by an arrow. The length represents the magnitude, and the direction shows the direction
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what are the 3 examples of contact forces
air resistance
tension
friction
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what are the 3 examples of non - contact forces
gravitational force
electrostatic force
magnetic force
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what is the equal, opposite force
reaction force
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weight =
mass X gravitational field strength
(9.8)
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what is the resultant force
the sum of the forces acting on an object
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resultant force =
mass X acceleration
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what does a smooth slope on a distance time graph represent
moving at a constant speed
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what does a steep slope on a distance time graph represent
moving at a faster speed
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what does a upwards curve on a distance time graph represent
accelerating
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what does a downward slope on a distance time graph represent
the object is returning to the starting position
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what does a flat line on a distance time graph represent
no movement
stationary
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what does a downwards curve on a distance time graph represent
decelerating
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how do you find the speed on the distance time graph
the gradient
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whats the difference between speed and velocity
speed is a vector quantities
velocity is a vector quantities
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what does a smooth slope on a velocity time graph represent
accelerating
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what does a flat line on a velocity time graph represent
moving at a constant speed
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what does a steeper slope on a velocity time graph represent
faster acceleration
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what does a downward slope on a velocity time graph represent
the object is decelerating
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how do you find the distance on a velocity time graph
area under line
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how do you find the acceleration on a velocity time graph
gradient
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acceleration =
final velocity - initial velocity
----------------------------
time taken
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stopping distance =
thinking distance + braking distance
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what increases thinking distance
alcohol
drugs
tiredness
distractions
age
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what increases stopping distance
mass of car
condition of brakes
condition of tires
icy conditions
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what is another way of describing terminal velocity
steady speed
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force =
mass X acceleration
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what is hookes law
when a weight (force) is applied to a spring it extends
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force =
spring constant X extension
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what is the limit of proportionality
the point at which the spring can return to its original length
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how is the limit of proportionality represented on a graph
the line is curved
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work done =
force applied X distance moved
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what is the amount of work done equal to
amount of energy transferred
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power =
energy transferred
-----------------
time
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what is power
the amount of work done every second
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what gravitational potential energy
the amount of energy an object has when it is held above the ground
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gravitational potential energy =
mass X gravitational field X height
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kinetic energy =
0.5 X mass X velocity*2
/
squared /
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is momentum a vector or scalar quantities
vector
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momentum =
mass X velocity
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start momentum =
end momentum
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which direction do field lines on a magnet run to
north pole to south pole
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what does closer field lines represent
stronger magnetic field
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where is the magnetic force the strongest
the poles
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do like poles attract or repel
repel
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do oposite poles attract or repel
attract
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what i induced magnetism
a magnetic material being placed in a magnetic field. This makes the material become magnetic
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what produces a magnetic field in a wire
a current
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what 3 ways make a electromagnetic stronger
increase number of turns
increase current
increase size of the magnetic core
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what happens when a wire with a current is placed in a magnetic field
it experiences a force
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how do you increase the size of the force produced by a wire with a current placed in a magnetic field
increase size of the current
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how do you reverse the size of the force produced by a wire with a current placed in a magnetic field
reverse the direction of the current
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what happens if the wire is parallel to the magnetic field
it wont experience a force
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force =
magnetic field strength X length of wire X current
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what does your index finger represent in the left hand rule
magnetic field
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what does your middle finger represent in the left hand rule
current
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what does your thumb represent in the left hand rule
direction of the force
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where is the motor effect used
electrical drills
hair dryers
loud speakers
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what do waves transport
energy
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can waves be reflected
yes
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what is an example of a longitudinal wave
sound
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what is the definition of a longitudinal wave
the direction of energy transfered are parallel to the oscillations
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what is the definition of a transverse wave
the direction of energy transfered are perpendicular to the oscillations
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what is compression
the particles are closer together than normal
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what is rarefraction
the particles are further away than normal
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what is the amplitude
the maximum dispacement form the rest position
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wavelength
the distance between two identical points on adjacent waves
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what is frequency
the number of full waves that pass in one second
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wave speed =
frequency X wavelength
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what is the order of the electromagnetic spectrum
radio waves
microwaves
infra- red
visible light
ultra-violet
x-rays
gamma rays
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what is an example of a radio wave
TV and radio
(communication)
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what is an example of a microwaves
cooking
communicating
satelites
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what is an example of a infra-red radiation
cooking
electrical heaters
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what is an example of a visible light
fibre optics
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what is an example of a ultra violet
security pens
fluorescent lights
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what is an example of a x-rays
medicine
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what is an example of a gamma rays
medicine
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what is the ionosphere
One of the layers in the Earth's atmosphere is called the ionosphere. Radio waves can be reflected from the ionosphere
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what is the 2 effects when the aerial absorbs the signal
the aerial gets hotter

an alternating current is produced in the aerial with the same frequency as the signal
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Other cards in this set

Card 2

Front

have a magnitude and direction

Back

what is a vector quantities

Card 3

Front

mass
volume

Back

Preview of the back of card 3

Card 4

Front

acceleration
velocity
force

Back

Preview of the back of card 4

Card 5

Front

its represented by an arrow. The length represents the magnitude, and the direction shows the direction

Back

Preview of the back of card 5
View more cards

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