Physics GCSE 1

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Velocity and distance time graphs
Speed ­ how fast you're going
Velocity ­ direction and speed in which travelling
Distance time graphs (pg. 72)
X axis ­ time y axis ­ distance gradient ­ speed
Flat sections represent stopping
Calculating speed is the gradient vertical distance
Acceleration is how fast the velocity is changing. Rate of change in speed
Formula for acceleration is: change in velocity
Time taken
E.g. Calculating the speed of the start journey. The vertical distance on this graph is 8m and the time taken is 4
secs so its 8/4 = 2m/s
Velocity time graphs
Y axis - velocity X axis ­ time gradient ­ acceleration (m/ s2 )
Flat sections represent steady speed
Calculate acceleration is the gradient vertical change
Horizontal change

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E.g. The vertical change for the start journey is 8m/s and the horizontal change is 4 secs so its 8/4 = 2m/ s2
To calculate the distance travelled you have to calculate the area under the gradient.…read more

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An object needs a resultant force start moving ­ BUT NEEDS NO RESULTANT FORCE TO KEEP MOVING AT A STEADY
Resultant force = acceleration
You need a resultant force to speed up slow down and start and stop or change direction.
Force = mass x acceleration acceleration = force/ mass F=mxa or a=f/m
Reaction forces
When two objects interact the forces they exert on each other are equal and opposite.…read more

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When the brakes of the vehicles are applied, work done by the friction force between the brakes and the wheel
reduce the kinetic energy and increase the temperature of the brakes.
When a force moves an object in a distance, energy is transferred and work is done
Work = transfer of energy
Work (J) = force (N) x distance (M)
E.g.…read more

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However there is a force beyond which the spring will never return back to its original shape (p).…read more


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