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Graph in PRWC

teolipseng99, Apr 14, 2018

1. Distance-Time Graph
2. Speed-Time Graph

1.

Distance-Time Graph

Observe the gradient (+ve, 0, -ve) when the vehicles move forward / backward

When the gradient of the vehicle is positive, it is

stationary moving forward moving backward

When the gradient of the vehicle is zero, it is

stationary moving backward moving forward

What is the distance travelled by the ambulance from t = 0 to t = 5 secs

60 80 40 20

What is the distance travelled by the ambulance from t = 0 to t = 10 secs

160 200 40 100

– Tom Button, teolipseng99

2.

Speed-Time Graph

What is the speed at t = 2s

2 m/s 5 m/s 3 m/s 4 m/s

What is the speed at t = 12s

2 m/s - 2 m/s

What is the distance travelled by the object from t = 0 to t = 8s (Hints: Area under graph)

36 m 24 m 48 m 12 m

Acceleration is the change of speed over time. From the graph above, the object starts from rest (speed=0) and accelerates to a speed of 6 m/s in 4 seconds. The acceleration can found by calculating the gradient.

What is the acceleration of the object at t = 2s

-3 3 -1.5 1.5

What is the acceleration of the object at t = 6s

6 0

Is the object moving at t = 6s

Yes No

Deceleration is the reverse of acceleration. That means the object is slowing down.

At t = 10s,[br]The gradient [math]m=\frac{6-0}{8-14}=-1[/math][br]The object is

Accelerating Decelerating

– teolipseng99

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