Presentation on theme: "Motion, Speed, and Velocity"— Presentation transcript:
1 Motion, Speed, and Velocity PhysicsMotion, Speed, and Velocity
2 SC Standards Covered PS-5.1 PS – 5.2 PS – 5.6 Explain the relationship among distance, time, direction, and the velocity of an objectPS – 5.2Use the formula v=d/t to solve problems related to average speed or velocityPS – 5.6Represent linear motion of objects on distance – time graphs
3 Motion When an object changes its position, motion has occurred. Distance- How far an object has moved.Displacement- How far an object has moved in relation to its starting point.Consider directionExample: Two runners travel along the same straight path in a straight line for 500 meters. At the end of the run their distances are the same but their displacements are different. How can this be so?
4 Speed- Distance an object travels per unit of time Relationships between speed, distance, and time:Speed = Distance/ Time = d/ tConstant Speed- speed does not change over timeAverage Speed- speed of motion when speed is changingAvg Speed = Total Distance/ Total TimeInstantaneous Speed- speed at any given moment in time (speedometer)
5 Graphing Motion Graph distance on the y-axis and time on the x-axis Slope = rise = distance = speedrun time
6 Distance - Time GraphIf something is not moving, a horizontal line is drawn.If something starts out slow and then speeds up, its change in speed can look like this.
7 Learning Checkpoint This graph shows several stages of motion: Stage 1: 100 m in 10 sStage 2: 50 m in 10 sStage 3: 150 m in 20 sCalculate the speed as indicated by each of the colors.Calculate the average speed.What is the total distance?What is the displacement?
8 Solution Stage 1: S= d/ t 100 m/ 10 s= 10 m/s Stage 2: S= d/t Ave Speed= Tot d/ Tot t300 m/ 40 s= 7.5 m/sDistance = 300 metersDisplacement = 0 meters
9 Velocity The speed and direction of an object’s motion. 88 km / hr southwest