Presentation on theme: "You know an object is in motion if it is changing position."— Presentation transcript:
1You know an object is in motion if it is changing position. Matter and MotionYou know an object is in motion if it is changing position.You know an object is changing position if it moves relative to a reference point.
2Distance and Displacement Distance is the length of the route you will travel.Displacement is the direction and difference in position between your starting and ending points.
3Distance and Displacement On your notes page, draw two examples of displacement. The first one with a displacement of zero, and the other with a displacement of 10 meters.Turn to your partner to check your drawings.
7Practice ProblemsA runner completes a 400-m race in 43.9 s. In a 100-m race, he finishes in 10.4 s. In which race was his speed faster?A passenger train travels from Boston to New York, a distance of 350 km, in 3.5 h. What is the train’s speed?
8Average Speed/Instantaneous Speed Average speed = total distance traveled divided by the total time taken.Instantaneous speed is the speed of an object at one instant of time.
9Graphing MotionWe will be working with Distance-Time graphs. For this type of graph, time is plotted on the horizontal axis and distance is plotted on the vertical axis.
10Graphing MotionCopy the chart below onto your notes page, and create a Distance-Time graph using the information.Bicycle Race DataTime (h)Distance (km)18216324432540
12Velocity = speed in a given direction. (magnitude & acceleration) Example:flying at 600 km/h eastDriving at 120 km/h southQuestion: Could you use a distance-time graph to show velocity? Why or why not?
13VelocityAnswer: No, because a distance-time graph would not show the direction of motion
15Combining Velocities example: Rowing down a riverRiver = 15 m/sYou paddle down 4m/sVelocities combine, your total velocity is 19 m/s down stream.
16Acceleration = to change in velocity / time to make change. Acceleration = rate of change of velocity. (ex. Car changing speed & direction…swerving)Velocity = (final velocity – original velocity)Acceleration = to change in velocity / time to make change.