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physics-motion
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Mind Map on physics-motion, created by shaunie.sle on 05/13/2014.
Mind Map by
shaunie.sle
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shaunie.sle
almost 11 years ago
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Resource summary
physics-motion
distance time graphs
we can use graphs to help us describe the motion of an object
a distance time graph shows the distance of a object from a starting point against the time taken
the speed of a object is the distance traveled each second
the gradient on a distance-time graph shows the speed. the steeper the gradient the greater the speed
if a object is stationary the line on the distance will be horizontal
if an object is moving at a constant speed the line on the distance-time graph will be represented as a strait line that slopes upwards
we can calculate the speed of an object by using a simple equation
speedm/s=distance traveled in metres/ time taken in seconds
distance-time graphs are to do with speed NOT acceleration
more about velocity time graphs
a velocity time graph shows the velocity of an object against the time taken
the gradient of the line on a velocity time graph represents acceleration
the steeper the gradient the greater the acceleration
if the line on a velocity time graph is horizontal, the acceleration is zero. therefore the object is moving at a constant speed
if the gradient on the line is negative then the object is decelerating
velocity-time graphs are to do with acceleration NOT speed
velocity and acceleration
the velocity of an object is its speed in a given direction
if an object changes direction it changes velocity, even if its speed stays the same
if the velocity of an object changes we say that its accelerating
we can calculate acceleration by using the equation:
a=v-u/t
if the value for accelerationis negative, the object is decelerating (slowing down). deceleration is the same as negative acceleration
where: A is the acceleration in m/s ^2, V is the final velocity m/s , U is the initial velocity m/s and T is the time taken s
using graphs
if you calculate the gradient of the line on a distance time graph you answer will be the speed of the object
if you calculate the gradient of the line on a velocity time graph your answer will be the acceleration of the object
calculating the area under the line between two times on a velocity time graph gives the distance travelled between those times
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