Question 1: Define a distance-time graph and explain what information it provides about an object's motion.

Answer: A distance-time graph plots the distance travelled by an object against time, showing how the object's position changes over time and indicating its speed and motion pattern.

Question 2: What does a straight, horizontal line on a distance-time graph indicate about the object's motion?

Answer: It indicates that the object is stationary, as its distance from the starting point does not change over time.

Question 3: Describe how the gradient of a distance-time graph relates to the speed of an object.

Answer: The gradient (slope) of the graph indicates the speed; a steeper gradient means higher speed, while a gentle slope indicates lower speed.

Question 1: A car travels 150 km in 3 hours. Calculate its average speed in km/h. Use the formula: Speed = Distance / Time.

Answer: 50 km/h

Question 2: An object covers a distance of 200 meters in 50 seconds. What is its average speed in m/s?

Answer: 4 m/s

Question 1: Outline a simple experimental setup to measure the distance travelled by a bicycle over a fixed period. Include variables you would control and safety precautions.

Answer: The setup includes a bicycle, a stopwatch, and a measuring tape or odometer. Variables to control include the starting point and rider's speed. Safety precautions involve wearing a helmet, ensuring the area is clear of obstacles, and checking the bicycle's condition before starting.

Question 1: A runner's distance-time data shows an initial rapid increase in distance, followed by a steady increase, then a plateau. Interpret these phases in terms of the runner's motion.

Answer: The initial rapid increase indicates acceleration at the start, the steady increase shows constant speed, and the plateau indicates the runner stopping or pausing.

Question 2: If a distance-time scenario shows a curved, upward-sloping line, what does this suggest about the object's acceleration?

Answer: It suggests the object is accelerating, as the increasing slope indicates increasing speed.

Question 1: Explain how a distance-time graph can be used to determine the average speed of a vehicle over a journey. Include the steps involved.

Answer: To determine average speed from a distance-time graph, identify the total distance travelled (final point on the graph) and the total time taken (difference between start and end times). Divide the total distance by the total time. The slope of the line connecting the start and end points gives the average speed over the journey.

Question 2: In the context of transportation technology, how can understanding distance-time graphs improve safety and efficiency?

Answer: Understanding distance-time graphs helps in analysing vehicle speeds, identifying periods of acceleration or deceleration, and planning safer, more efficient routes by monitoring motion patterns.