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Forces
Descripción
An overview of what you need to know for GCSE AQA physics topic 5. Please rate and comment so I can improve these resources for people to use in the future, thanks :-)
Sin etiquetas
aqa
forces
gcse
science
physics
speed
aceleration
friction
motion
gcse additional science
momentum
physics
forces
gcse
Mapa Mental por
Brodie McMeowface
, actualizado hace más de 1 año
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Creado por
Brodie McMeowface
hace casi 7 años
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Resumen del Recurso
Forces
Forces and work done
Scalar
Speed
Distance
Overall
Vector
Velocity
Displacement
In a certain direction
Contact forces touch the object
Non-contact can act without touching the object, e.g. gravity
Resultant force diagrams
If forces cancel out, the object doesn't move
W.D = force * distance
Stretching and turning
Deformations
An elastic deformation is one which returns to its origional shape
An inelastic one is one that doesn't return to its original shape
The spring constant is k when force = k*extention
found in force-extension graphs by the gradient
Are under the graph = elastic energy stored
Moments
Moment of a force = force * distance
Bigger distance = bigger force
for an object to balance, the clockwise and anticlockwise moments must be the same
Gears rotation changes for each gear connected
Pressure
pressure = force / area
measured in pascals
Pressure increases the deeper you are in a liquid as there is more liquid on top of you
Pressure(pa) = depth(m) * density(kg/m^3) * gravitational field strength(N/kg)
Upthrust occurs when the pressure at the bottom of an object is greater than the pressure at the top
Atmospheric pressure decreases with height
Motion
displacement is the distance from one point to another in one direction
distance is how far something has traveled
Acceleration = velocity/time
Uniform acceleration means accelerating at a constant rate
The gradient of a distance-time graph = speed
The gradient of a velocity-time graph = acceleration
Terminal velocity is the speed at which the deceleration from air resistance = acceleration from gravity so an object stops accelerating
Newtons laws
An object needs a force to move
Acceleration is directly proportional to resultant force
each action has an equal and opposite reation
Inertia is the tendency for an object's motion to remain unchanged
Car safety and momentum
Stopping distance = thinking distance + braking distance
reaction times
factors
speed (both the distance over time and the drug)
Reaction time
tiredness
drugs
alcohol
average reaction times
Tests
Drop a ruler unexpectedly and see where they catch it
Identify when colour changes and how long it was since the colour actually changed
Breaking time factors
Speed (not the drug this time)
weather
Tyre condition
How good the brakes are
Momentum is vector
Cars are designed to stop a person over a longer period of time to make the force lower
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