PPT-Section 1.3 Velocity and Speed (cont.)

2015 Pearson Education Inc Velocity and Speed Speed measures only how fast an object moves but velocity tells us both an objects speed and its direction The velocity defined by Equation 12 is called the . WHY More teens die from car crashes than any other cause and the first year is the most dangerous WHEN 64 National Teen Driver Safety Week October 1524 2014 WHO High school students age 14 along with their schools communities friends and families u Average speed. Speed is a . scalar. variable. Unit . = . length over time (m/s. ). Instantaneous velocity. Speed and direction of object at a particular instant in time. Velocity is a . vector. PHYS 243. Giancoli. , Sec 2-1, 2, 3, 4. © . 2011, . B.J. . Lieb. Analysis of a Race. All distances measured from starting line.. Time measured by a stopwatch from sound of gun.. Initial speed will be zero. . A . vector quantity. is a quantity that has both magnitude and direction. Velocity, acceleration, and force are examples of vector quantities. . A . scalar quantity. is a quantity that has magnitude, but no direction. Time, mass, volume, and speed are examples of scalar quantities.. You can see it on a. . . position time . graph OR. a . velocity time . graph. POSITION v TIME. Velocity is seen by the . slope. Graphing motion. position-time. Section 1 on graph represents biker going forward. How are instantaneous speed and average speed different?. . Speed. Average speed is computed for the entire duration of a . trip (includes starts and stops so it slows your rate down), . and instantaneous speed is measured at a particular . Essential Question: How do you calculate the displacement and velocity of an object?. What is mechanics?. The branch of physics concerned with motion and forces.. The subset of mechanics that describes motion without regard to its causes is called kinematics.. Bell Ringer 11-7-13. Compare and Contrast Speed, Velocity and Acceleration. is the speed of an object in a particular direction. MYP Unit Question: What Moves YOU!!. Area of Interaction: Human Ingenuity. Men’s Olympic Speed Skating What is speed skating? Speed skating is a competitive form of ice skating where competitors race each other in travelling a certain distance on skates. Men compete in 500m, 1,000m, 1,500m, 5,000m and a 10,000. In each event, skaters race in pairs against the clock on a standard 400m oval ring. All events are skated once, apart from the 500m, which is skated twice. In this case, the final result is based on the total time of the two races. Velocity and acceleration Measuring an objects motion speed Speed is calculated by dividing distance by time S = d/t 5.0 km/h 2.5 m/s 45 mph velocity Velocity is the same as speed, but you tell the direction of motion in the answer. Displacement: . Is the distance from where you start to where you finish. . Δ. d=. d. f. -d. i. Velocity:. How fast and in what direction (vector quantity). V = ∆d/t. Speed: . How fast (scalar quantity). 9/18/18. What Is Motion?. Motion is when an object changes place or position. . To properly describe motion, you need to use the following:. Start and end position?. Movement relative to what?. How far did it go?. In physics, . velocity . is speed in a . given direction. . . When we say a car travels at 60 km/h, we are specifying its speed. . When we say a car moves at 60 km/h to the . north. , we are specifying its velocity.. Measuring Waves: Variables Recap. Frequency. . ( f ). # of waves passing a point in 1 second. SI unit: Hertz (Hz). shorter wavelength .  higher frequency  higher energy. 1 second. Range for human hearing =.