Time Graphs — Solutions

1. Boiling the Kettle

   1. Steep section: Temperature rising rapidly ▶ View Solution
   2. Flat section: Temperature constant at boiling point (100°C) ▶ View Solution

2. Flat Lines

   A flat horizontal line means: The object is stopped — distance from the starting point is not changing ▶ View Solution

3. Comparing Speed

   Faster object: Line A ▶ View Solution

4. Ben’s Commute

   1. Sitting on the bench: Middle section (the flat horizontal portion) ▶ View Solution
   2. Longer time taken: Walking there took longer ▶ View Solution

5. Speed Calculation

   1. Jordan (400 m in 10 min): 40 metres per minute ▶ View Solution
   2. Sam (400 m in 5 min): 80 metres per minute ▶ View Solution

6. The Bathtub

   1. Filling: Up ▶ View Solution
   2. Draining: Down ▶ View Solution
   3. Sitting in it: Flat (horizontal) ▶ View Solution

7. Filling Jugs

   1. Jug A and Jug B graph shapes: Jug A: straight line   Jug B: curved (non-linear) line ▶ View Solution
   2. Rate of change: Yes — water level increases by exactly 4 cm every 2 seconds ▶ View Solution
   3. Relationship type: Linear ▶ View Solution

8. Pizza Delivery Race

   Matching graph for Driver 2: Graph B ▶ View Solution

9. Calculating Speed from a Graph

   1. Distance (y-axis): 100 km ▶ View Solution
   2. Time (x-axis): 2 hours ▶ View Solution
   3. Speed: 50 km/h ▶ View Solution

10. Story Matching

    1. Matching shape: Shape B ▶ View Solution
    2. Why Shape A doesn’t match: Shape A shows a fast rise then slow fall — the opposite of the story ▶ View Solution