Motion

Definition Motion is an event that involves a change in the position or location of something.

Motion is Relative Relative – it is described compared to a REFERENCE POINT

Speed Average Speed Comparison of time and distance Distance traveled per unit time S = d / t T = d / s D = s x t

Speed Instantaneous Speed Speed at any instant

Speed Constant Speed Speed that does not change Instantaneous speed that does not change

Velocity Speed in a specific direction

Distance – Time Graph Distance Time

Click the picture below that matches graph A. Distance – Time Graph Click the picture below that matches graph A. Distance A Time

Click the picture below that matches graph B. Distance – Time Graph Click the picture below that matches graph B. Distance B A Time

Click the picture below that matches graph C. Distance – Time Graph Click the picture below that matches graph C. Distance C B A Time

Click the picture below that matches graph D. Distance – Time Graph Click the picture below that matches graph D. D Distance C B A Time

Click the picture below that matches graph E. Distance – Time Graph E Click the picture below that matches graph E. D Distance C B A Time Steeper means faster!

Distance-Time Graphs… Show the motion of an object by plotting the distance the object has traveled against the time.

The unit for Distance is miles The unit for Time is hours So what is the unit for speed? 345018 mph miles per hour

Motion Graph # 1 Straight, Flat Line As time passes, there is no change in distance; no motion

Motion Graph # 2 Straight, Increasing Line As time passes, distance increases The change in distance in constant – no stopping & starting

Motion Graph # 3 Straight, Decreasing Line As time passes, distance decreases The change in distance is constant

Motion Graph # 4 Changing Line A changing line means changing distance Distance increases  doesn’t change  decreases

30 At this speed, how far would you travel What’s the speed limit? in ½ an hour? in 2 hours? in 10 minutes? in 1 hour?

What speed? 1 hour to travel 20 km So Speed = 20 km/h Distance – Time Graph 1 2 10 20 30 40 50 Distance (km) Time (hours) 1 hour to travel 20 km What speed? So Speed = 20 km/h

What speed? 2 hours to travel 30 miles So Speed = 15 mph ? Distance – Time Graph 1 2 10 20 30 40 50 Distance (miles) Distance (miles) ? Time (hours) 2 hours to travel 30 miles So Speed = 15 mph What speed?

What was the speed for the first part of the journey? Distance – Time Graph 1 2 10 20 30 40 50 Distance (km) Time (hours) What was the speed for the first part of the journey? 10 km in 1 hour, so 10km/h. ¼ of an hour (15 minutes) 2¾ hours (2 hours 45 minutes) How long did it take to run 40 km? How long did she stop for? Approximately 7½ kilometres. How far in ¾ of an hour?

Distance – Time Graph Slower Distance Stopped Fast Time

In your notebook… p. 78 p. 79 Speed & D/T Graphs Notes Draw a Picture or Create a Thinking Map to describe Motion and Velocity. Summary: (5 sentences) Describe how motion, speed and velocity affect objects daily in your life. Explain the parts of a D/T graph. Speed & D/T Graphs Notes Glue in your Forces Notes here