PPT-Speed –Time Graphs for

Acceleration January 27 th 2011 Lesson 7 Speed Time Graphs for Acceleration Acceleration is a description of the relationship between speed and time Essentially it is a change in speed over time . Describing the motion of an object is occasionally hard to do with words. Sometimes . graphs. help make motion easier to picture and therefore understand.. Remember:. Motion. is a change in position measured by distance and time.. In maths, words can be very important and sometimes have a more specific meaning than we first think.. For example, if we talk about ‘doing a sum’, many people think this means the same as a ‘doing a calculation’, but ‘sum’ means ‘addition’, so 7-3=4 is not strictly a ‘sum’ at all.. Kinematics Terminology. Scalar vs. Vector. Scalar: . quantities that have only a size, but no direction. i. e. : . distance, speed. Vector: . quantities that have a size and direction. ie. : . displacement, velocity. Mr. Lambert. Integrated Science 1A. Trimester 2, . 2014. Bell Ringer. . Draw a distance-time graph that depicts the motion of the woman:. A woman walks 300 meters to get to the post office. She stops for a short time and realizes that she left the stove on in her house. She quickly runs home.. Vectors & Scalars . Vectors . Magnitude & direction. Magnitude-how much. Direction-which way. Examples. Displacement. Velocity. Weight. Acceleration. Scalars. Magnitude. Magnitude- how much . Distance/Time. Distance. Distance. Distance. D. t. D. t. D. t. Gradient = . speed. Distance-Time graph. gradient = velocity. Graphs Representing Motion. Velocity-time graph. Gradient = acceleration. Area . Motion graphs are an important tool used to show relationships between position, speed and time.. It’s an easy way to see how speed or position change over time. Distance vs. Time Graph. Shows an object’s position at a given time.. Describing changes in velocity, and how fast they occur, is a part of describing motion.. How are changes in velocity described?. The rate at which velocity changes is called. . acceleration.. Scientists can perform artificial transmutations by bombarding atomic nuclei with high-energy particles such as protons, neutrons, or alpha particles.. Review - Speed. Speed: . The measure of how fast/slow something moves a particular distance over a given amount of time.. It can then be calculated using the following formula: . v=d/t. How do you graph speed?. Equations. - give the equation and units linking:. Average speed, distance, time. Acceleration, change in velocity, time taken. Distance time graphs – . label each line. Explain how to calculate speed using different parts of the graph. . Mr. Fedell. VT vs. PT graphs. A position-time (PT) graph tells you . where an object is.. A velocity-time graph tells you . how fast it’s moving.. **(VT graphs DO NOT give in position info!)**. When an object stays still for 10s, its velocity is . Position. vs. time Graph. Low on the graph. .. High on the graph. .. Slopes uphill.. Slopes downhill.. 0. x. t. Near. Far. Away. Toward. How to interpret a . Position. vs. time Graph. Steep slope.. What is acceleration?. If you’re traveling in a car at a constant speed of 50 mph, are you accelerating?. No, you’re not. . Acceleration is the rate of change of velocity. . Acceleration. In order for acceleration to occur, velocity MUST be . VS.. SPEED (VELOCITY)/ TIME GRAPHS. DISTANCE-TIME GRAPHS. Plotting distance against time can tell you a lot about motion. Let's look at the axes:. Time is always plotted on the X-axis. (bottom of the graph). .