Question 1: Distance-Time graphs are graphical representations that show how an object's distance from a starting point varies with time. They are used to analyse the speed and motion of objects in various contexts.

Answer: Distance-Time graphs display the relationship between the distance an object travels and the time taken. The gradient indicates the speed of the object.

Question 1: What does a straight, diagonal line on a Distance-Time graph indicate about the object's motion?

Answer: Constant speed motion, with the gradient representing the speed.

Question 2: What does a flat (horizontal) line on a Distance-Time graph signify about the object's movement?

Answer: The object is stationary; no change in distance over time.

Question 1: An object covers 150 metres in 30 seconds. Calculate its average speed in metres per second (m/s).

Answer: 5 m/s

Question 2: A car accelerates from 0 to 25 m/s in 10 seconds. If the acceleration is uniform, what is the average speed during this period?

Answer: 12.5 m/s

Question 1: Describe a safe method to measure the distance travelled by a toy car moving on a straight track using a sensor. Include key variables to control and safety precautions.

Answer: Use a motion sensor connected to a data logger to record the distance over time. Ensure the track is stable and clear of obstructions. Keep hands away from moving parts to prevent injury.

Question 2: A student records the distance travelled by a bicycle over various time intervals. The data shows increasing distances over time, but the rate of increase slows down. Explain what this indicates about the bicycle's motion.

Answer: The bicycle is decelerating; its speed is decreasing over time.

Question 1: Explain how Distance-Time graphs are used in the automotive industry to improve vehicle safety and performance.

Answer: They help analyse vehicle acceleration and deceleration patterns, aiding in designing safer braking systems and fuel-efficient engines.

Question 2: A GPS device logs the distance traveled by a delivery drone every minute. How can analysing this data using Distance-Time principles help optimise delivery routes?

Answer: By examining the rate of change of distance over time, operators can identify faster routes, reduce travel time, and improve energy efficiency. Recognising periods of acceleration and deceleration can also help in planning safe and efficient flights.