PHY 2020 Lecture Notes - Lecture 3: Speedometer
Document Summary
Everything moves- even things that appear at rest. 2 km/h: 100 km/h- 98km/h=2 km/h. You"re in a car traveling at some specified speed limit. You see a car moving at the same speed coming toward you. Double the speed limit: relative motion. Speed at any moment: speedometer can be used for both. Average speed total distance covered in a certain time interval. Speed is distance and time velocity is speed and direction. Yes if velocity is constant therefore, so is speed. We say that a body is accelerating when its velocity is changing. Harry says acceleration is how fast you go. Carol says acceleration is how fast you get fast. Starting from rest, one car accelerates to a speed of 50 km/h, and another car accelerates to a speed of 60 km/h. There is not time involved, therefore the question cannot be answered. Cite an instance in which your speed could be zero while your acceleration is nonzero.
