Anatomy Of A Speed-time Graph
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The Anatomy of a Speed-Time Graph A horizontal line means the speed is not changing. The body is travelling at a constant speed.
A line sloping up means the body is accelerating (speeding up).
(The gradient is zero).
speed m/s
A line sloping down means the body is decelerating (slowing down).
speed is plotted on the y axis
The area under the graph gives the distance travelled. A
B
C
D
Distance = A + B + C + D + E
E
We can find the acceleration by finding the gradient. Here, the acceleration is:
݃= ݐ݊݁݅݀ܽݎ
10 = 10 ݉/ ݏଶ 1
time / s time is plotted on the x axis
A + B + C + D + E = Triangle + rectangle + parallelogram + rectangle + triangle
1 10 + 14 1 ൬ × 1 × 10൰ + ሺ2 × 10ሻ + ൬ × 1൰ + ሺ14 × 2ሻ + ൬ × 1 × 14൰ 2 2 2 = 72 ݉
A line sloping up means the body is accelerating (speeding up).
(The gradient is zero).
speed m/s
A line sloping down means the body is decelerating (slowing down).
speed is plotted on the y axis
The area under the graph gives the distance travelled. A
B
C
D
Distance = A + B + C + D + E
E
We can find the acceleration by finding the gradient. Here, the acceleration is:
݃= ݐ݊݁݅݀ܽݎ
10 = 10 ݉/ ݏଶ 1
time / s time is plotted on the x axis
A + B + C + D + E = Triangle + rectangle + parallelogram + rectangle + triangle
1 10 + 14 1 ൬ × 1 × 10൰ + ሺ2 × 10ሻ + ൬ × 1൰ + ሺ14 × 2ሻ + ൬ × 1 × 14൰ 2 2 2 = 72 ݉
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