Physics 2

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  • Created by: natalie
  • Created on: 06-11-16 11:37
speed
distance travelled in a gven time
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velocity
speed in a particular drection
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units for both speed and velocity are
m/s
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acceleration
the rate at which velocity changes
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object moving at a constant speed the distance time graph is
a straight line sloping upwards
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the speed of an object is represented by the
gradient of the line
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to find the gradient we need to
draw a triangle under the line
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height of triangle shows
distance travelled
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base represents
time taken
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the gradient of the line=
height of triangle divided by base of triangle= objects speed
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veocity time graphs. height and base...
height is the change in velocity. base is the time taken.
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acceleration (m/s|squared is the...
change in velocity divided by time taken
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the speed of an object is given by...
the gradient of the line on its distance time graph
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the acceleration of an object is given by...
the line on its velocity time graph
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the distance travelled by an object is given by...
the area under the line of its velocity time graph
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The resultant force is
the overall effect of all the forces acting on an object
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the bigger the resultant force...
the bigger the acceleration
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the bigger the force...
the faster it goes
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the bigger the mass...(the heavier it is...)
the smaller the acceleration (the slower it goes)
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Force equation
force(N)= mass(kg) X acceleration(m/s2)
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Stopping dstance=
thinking distance (distance car travels during reaction time)+ braking distance (distance car travels after braking/slowing)
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things that affect thinking distance
speed of car.tired driver.distracted by passengers. using phone. drugs. alchohol.
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things that affect braking distance
speed of car. weight of car. bad brakes. icy road. wet road. number of passengers. worn tyres.
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terminal velocity
At first, gravity is bigger thann friction. later, as the velocity increases the friction increases. evemtually, force of friction is equal to the force of gravity, the forces are equal/balanced. the object falls at constant velocity
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when an object has air resitance it has..
friction
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the spring constant is..
the force needed to stretch the string by one unit. eg: if it took 7N to stretch a spring each mm, the spring constant would be 7N/mm
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STRETCHING STEEL
as the force gets bigger the extension gets bigger. the extension increases steadily. the force is in proportion to the extension
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STRETCHING COPPER
To start with, after the force increases, extension increases steadily. he force is in proportion to the extension. when you double the force, the extension doubles too. after the limmit of proportionality is reached, it stretches more
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Mass
the amount of material in an object (g/kg)
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weight
the force of gravityon an object. (N)
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Gravity on earth is..
10N/kg
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Gravitational Potential Energy eqation
mass(kg) X gravity (10N/kg)X vertical distance moved (height)(m) (Ep=mxgxh)
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kinetic energy equation
1/2 mass X velocity2 ( Ek=1/mXv2)
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controlled variable is
the variable you keep the same
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independent variable is ..
the variable you change
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dependent variable is
the variable you measure
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Other cards in this set

Card 2

Front

velocity

Back

speed in a particular drection

Card 3

Front

units for both speed and velocity are

Back

Preview of the front of card 3

Card 4

Front

acceleration

Back

Preview of the front of card 4

Card 5

Front

object moving at a constant speed the distance time graph is

Back

Preview of the front of card 5
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