Slide 2-5 Reading Question 2.1 The slope at a point on a position-versus-time graph of an object is the A. Object’s speed at that point. B. Object’s average velocity at that point. What is the formula for speed? , How is speed different from velocity?, What is the average speed of a cow that walks east 60 meters in 90 seconds? (Remember, the units must be m/s or km/hr), A porcupine moved toward a pond at a speed of 5 m/s. Observe that the line on the graph is a straight, diagonal line. As learned earlier, a diagonal line on a velocity versus time graph signifies an accelerated motion. Since a free-falling object is undergoing an acceleration (g = 9.8 m/s/s, downward), it would be expected that its velocity-time graph would be diagonal.

A horizontal line above the time axis of a speed vs. time graph means an object is ___. a) not moving b) moving at a constant speed c) moving at a constant velocity

Let's assume this distance equals 20 cm and display the ball's behavior on a graph plotting its x-position versus time. The slope of this line would equal 20 cm divided by 0.1 sec or 200 cm/sec. This represents the ball's average velocity as it moves across the table. Since the position of such an object doesn't change its position vs time graph is a straight, horizontal line, as shown in blue in the Figure below. Figure 2.2: Position-Time Graph The next simplest motion, is that of an object going at constant velocity (hence zero acceleration). Jul 07, 2009 · A horizontal line on the x-axis means velocity stays at zero so the object is at rest. However, a horizontal line at y=2 means that the object is moving at a constant velocity of 2 units. Note that this is very different from the position-time graph (where this same horizontal line meant that the object was at rest). Oct 04, 2019 · The velocity vs. time graph for an object moving along a straight path is shown in the figure below. v (m/s) 8 6 2 0 t(s) 20 Ао 15 -2 -4 (i) Find the average acceleration of this object during the following time intervals. The vertical axis of a velocity-time graph is the velocity of the object. The horizontal axis is the time from the start. Features of the graphs When an object is moving with a constant velocity,... Slide 2-5 Reading Question 2.1 The slope at a point on a position-versus-time graph of an object is the A. Object’s speed at that point. B. Object’s average velocity at that point. Problem 1: Consider the following eight velocity vs. time graphs. Positive velocity is “forward” velocity. Graph A Graph B Graph C Graph D Graph E Graph F Graph G Graph H (a) Rank the objects based on their acceleration from “most forward” to “most backward”. (If any two graphs The vertical axis of a velocity-time graph is the velocity of the object. The horizontal axis is the time from the start. Features of the graphs When an object is moving with a constant velocity,... Enter 180 in the velocity box and choose miles per hour from its menu. Enter 50 in the time box and choose seconds from its menu. Click CALCULATE and your answer is 2.5 miles (or 13,200 feet or 158,400 inches ,etc.) Here's hoping this calculator helps you with those math problems. ***** Average velocity and average speed from graphs Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501(c)(3) nonprofit organization. Answer: C Constant speed is a constant slope on a position-time graph, a horizontal line on a velocity time graph or a zero value on an acceleration-time graph (A) Graph I only (B) Graphs II and V only (C) Graph II only (D) Graphs I and IV only (E) All of the above graphs represent constant velocity 2. The graph above shows velocity v versus ... QUESTIONS. For the graphs shown below, draw the velocity-time graph on the right that correspond to the position-time graph shown on the left. Unlike real objects you can assume these objects can change velocity so quickly that it looks instantaneous with this time scale. 12. 3. Can be found by connecting two points on a line on a velocity versus time graph and finding the slope of that line. average velocity - an object’s displacement divided by time elapsed. Can be found by connecting two points on a line on a position versus time graph and finding the slope of that line. Velocity. Information on how fast an object is travelling can also be found from a position versus time graph. To find the velocity (speed and direction) of an object, we draw a straight line tangent to the positive versus time curve at the time for which we want to know the velocity. 5.Given a graph of velocity v. time, what does a horizontal line represent? A. The object’s acceleration is positive. B. The object is moving at constant velocity. C. The object’s acceleration is negative. D. The object is standing still. 6. The path of a projectile is ____. A. curved B. always horizontal C. always vertical D. straight 7. Graph G matches description _6_ because _horizontal line = constant speed_. Graph H matches description _5_ because _no line = no speed = no movement_. A speed-time graph shows us how the speed of a moving object changes with time. • The steeper the graph, the greater the acceleration. • A horizontal line means the object is An object is speeding up (what we call “acceleration” in everyday speech) whenever the velocity and the calculus acceleration are both positive or both negative. And an object is slowing down (what we call “deceleration”) when the velocity and the calculus acceleration are of opposite signs. Look at all three graphs in the figure above ... Given the position-versus-time graph of , find the velocity-versus-time graph. Figure 3.7 The object starts out in the positive direction, stops for a short time, and then reverses direction, heading back toward the origin. Since the velocity is constant, the displacement-time graph will always be straight, the velocity-time graph will always be horizontal, and the acceleration-time graph will always lie on the horizontal axis. When velocity is positive, the displacement-time graph should have a positive slope. A distance/time graph tells people how far an object has moved with time, the steeper the graph: the faster the motion. A horizontal line means the object is not changing its position; it is stationary. A downward sloping line means the object is returning to the start. This shows position versus time. Notice that velocity changes linearly with time and that acceleration is constant. Misconception Alert! Notice that the position vs. time graph shows vertical position only. It is easy to get the impression that the graph shows some horizontal motion—the shape of the graph looks like the path of a projectile. Mar 12, 2013 · The graph shows the velocity versus time for an object moving in a straight line. At what time after time = 0 does the abject again pass through its initial position? (A) Between O and 1 s (B) at 1 s (C) Between 1 and 2 s (D) at 2 s (E) Between 2 and 3 s Show your work: Free Fall An object falls accelerated by gravity g = 9.8 m/s2 downward. Decceleration is constant since the Vx vs t graph is a st line. You can use use the appropriate equations to find the displacement in the first sec after the application of the breaks. This, added to the displacement at the end of 2 seconds (with constant velocity of 4m/s), gives the displacement at the end of a period of 3 sec. The -graph is a straight-line between and , indicating constant acceleration during this time period. Hence, Hence, The negative sign indicates that the object is decelerating.