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A car travels along a straight road. The speed-time graph for this journey is shown.

During which labelled part of the journey is the resultant force on the car zero?

In the speed-time graph provided, the resultant force on the car is zero when the car is moving at a constant speed because there is no acceleration (Newton's First Law of Motion).

Looking at the graph:

- **Section A**: The car is accelerating, so the resultant force is not zero.
- **Section B**: The speed is constant, which means no acceleration and thus the resultant force is zero.
- **Section C**: The speed is constant again, so the resultant force is zero.
- **Section D**: The car is decelerating, so there is a negative acceleration and the resultant force is not zero.

Therefore, the resultant force on the car is zero during **sections B and C** of the journey.

Would you like more details or have any other questions? Here are some related questions:

1. What does the area under the speed-time graph represent?
2. How does the slope of the speed-time graph relate to acceleration?
3. What would the graph look like if the car came to a stop?
4. How does the concept of inertia relate to a flat section on a speed-time graph?
5. Can you explain how friction affects the speed-time graph?

**Tip:** Remember, on a speed-time graph, a flat horizontal line indicates constant speed, where no net force is acting on the object.

Explore when the resultant force on a car is zero during its journey along a straight road, analyzed using Newton's First Law of Motion. Discover the implications of constant speed on speed-time graphs and how it relates to forces acting on the car. Suitable for high school students studying physics and Newtonian mechanics.

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