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Physics

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
Time

Acceleration is…

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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.

The acceleration of an object is calculated by this equation of an object…

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An object needs a resultant force start moving ­ BUT NEEDS NO RESULTANT FORCE TO KEEP MOVING AT A STEADY
VELOCITY!!!!

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/…

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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.

Work

When a force moves an object in a distance, energy is transferred and work is done

Work =…

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

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