# Non-Linear Motion

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What is friction?
a force that opposes motion
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What is contact friction?
between solid surfaces
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What is fluid friction?
drag
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What is a fluid?
a gas or liquid
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Describe the friction experienced in fluids
force of drag depends on the viscosity of fluids, it will increase as speed increases // also depends on shape of object (surface area)
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What factors affect the magnitude of a drag force?
velocity of object // shape (SA) of object // density or viscosity of fluid // dynamics of object
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What is weight?
the gravitational force acting upon an object
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Describe the motion of a body falling in an uniform gravitational field
initially accelerates // object will experience air resistance known as drag // drag depends on SA, bigger objects experience more force, friction increases as speed increases// eventually air resistance will equal weight - terminal velocity
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Describe the motion of a body falling with a parachute
will accelerate til terminal velocity // before reaches ground parachute opens to decrease velocity, SA of chute will increase drag, slows them down and they reach a new smaller terminal velocity
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What is terminal velocity?
constant velocity of an object travelling through a fluid, net force is 0 // drag is equal to weight
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How does the mass of an object impact upon it's terminal velocity?
as weight = m x g, with a larger mass the weight will also be larger, this will cause the time taken to reach TV to be longer
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What will reaching terminal velocity look like on a displacement-time graph?
curved, then becomes straight
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What will reaching terminal velocity look like on a velocity-time graph?
increase then level off
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What will reaching terminal velocity look like on an acceleration-time graph?
level, then decrease to 0 as no acceleration when velocity is constant
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## Other cards in this set

### Card 2

#### Front

What is contact friction?

#### Back

between solid surfaces

### Card 3

#### Front

What is fluid friction?

What is a fluid?

### Card 5

#### Front

Describe the friction experienced in fluids