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### 304-F: Story to Graph Selection 3: The Traffic Light Problem

• Topic Cluster: Kinematics
• Topic: Forward and Backwards Kinematics Qualitative
• Objective: Given a story, select the position-time, acceleration-time, and velocity-time graphs that reflect the story.
• Content:
• Level: 3

### Table 1

The following stories consider a road that travels east-west with a traffic light in the middle. The origin is defined as the traffic light, and the positive direction is defined to be east.

Story
Position-Time Graph
Velocity-Time Graph
Acceleration-Time Graph
1. A car approaches the traffic light from the west, traveling east. The light is red, so the car slows down, stops, and waits at the light. When the light turns green, the car accelerates again.
2. A car approaches the traffic light from the east, traveling west. The light is red, so the car slows down, stops, and waits at the light. When the light turns green, the car accelerates again.
3. A car approaches the traffic light from the west, traveling east. The light is yellow, so the car speeds up to pass the light. After passing the light, the car slows to its initial velocity.
4. A car approaches the traffic light from the east, traveling west. The light is yellow, so the car speeds up to pass the light. After passing the light, the car slows to its initial velocity.
5. A car approaches the traffic light from the west, traveling east. The light is green, so the car passes through the light without changing speed.
6. A car approaches the traffic light from the east, traveling west. The light is green, so the car passes through the light without changing speed.

A:
B:
C:
D:
E:
F:

A:
B:
C:
D:
E:
F:

#### Acceleration-Time Graphs for Table 1

One of the acceleration-time graphs is used twice

A:
B:
C:
D:
E:

### Video Resources

#### AP Physics 1: 1.2 Daily Video 3 (Skill 1.4)

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