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Physics (P2) revision…read more

Slide 2

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Distance ­ time graphs
· Can sue graphs to help us describe motion of object
· Distance-time graphs shows distance of object from starting
point (y-axis) against time taken (x-axis)
· Speed of object is distance travelled each second
· Gradient of line on distance-time graphs represents speed-
steeper gradient, greeter speed
· Object = stationary, line on distance-time is horizontal
· Is object moving at constant speed, line on distance-time graph
is straight ;time that slopes onwards
· Calculate speed of an object by distance, time, speed triangle…read more

Slide 4

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Velocity and acceleration
· Velocity of object = its speed in a given direction
· Object changes direction it changes velocity, even if its speed stay
· Velocity f object changes say that it accelerates
· Calculate acceleration ­ a = v-u / t
A = acceleration in metres per second squared m/s²
V = final velocity metres per second m/s
U = initial velocity in metres per second m/s
T = time taken for change in seconds s
· Value calculated for acceleration is negative, body is decelerating
slowing down ­ deceleration is same as negative acceleration…read more

Slide 5

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More about velocity ­ time graphs
· Velocity-time graph shows velocity of object (y-axis) against
time taken (x-axis)
· Gradient of line on velocity-time graph represents acceleration
· Steeper gradient = greater acceleration
· Line on velocity-time graph horizontal, acceleration = 0 ­
therefore, object is travelling at steady speed
· Gradient of line = negative, object is decelerating
Area under graph in velocity-time graph represents distance
travelled in given time ­ bigger area, greater distance travelled…read more

Slide 6

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Using graphs
using distance-time and velocity-time graphs
· If calculate gradient of line on distance-time graphs for object ­
answer = speed of object
· Calculate gradient of line on velocity-time graph for object ­
answer = acceleration of object
· Calculating area under line between two times on velocity-time
graphs gives distance travelled between those times
· Always use number from graph scales in any calculations…read more

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Slide 9

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Slide 10

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