Physics · Unit 3 · Gravity and motion · Projectile motion
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A cyclist travels 18 km in 1.5 hours along a route that includes uphill and downhill sections. (a) Describe what is meant by average speed. (1 mark) (b) Calculate the cyclist's average speed in km/h. (1 mark)
A satellite orbits Earth at a constant altitude, completing one full orbit every 90 minutes and travelling a total distance of 42,000 km per orbit. Describe the concepts of average speed and period as they apply to this satellite's motion.
A satellite in a circular orbit around Earth completes one full orbit every 5,400 seconds, travelling a total distance of 42,000 km. A student observes the satellite's motion and records position data at regular intervals. The data shows the satellite moves at a constant rate throughout its entire orbit. Describe the concept of average speed as it applies to this satellite's motion, and explain how the concept of period relates to the orbital characteristics observed.