Slide 1: Motion and Velocity Displacement in Time and Space Ft. Per Second MPH Meters/Sec.
Slide 2: Work = Force x Distance Machines Produce Work by Transforming Energy or Changing the Direction or Distance Through Which a Force Acts Machines, Mechanisms and Motion are Intimately Related
Slide 3: Motion or Movement is a Change In Position Called Displacement 10 ft. Position A Position B
Slide 4: Speed is the Rate of Displacement 10 ft. Position A Position B 10 0 Seconds
Slide 5: Velocity is the Rate of Displacement in a Specified Direction 10 ft. Position A Position B 10 0 Seconds East South West North
Slide 6: Speed Equations An object’s speed is a function of Displacement (change in position) and Time (change in time between positions)
Slide 7: Speed Equations A simple and useful version of the Speed Equation Looks Like This
Slide 8: If You Want to Know the Distance Traveled You Can Rewrite the Equation Like This
Slide 9: Position-Time Graphs Describes the Rate of Change in Position of an Object Over Time Distance (ft) Vs. Time (sec.) Distance 60 80 100 120 140 160 180 20 2 3 4 5 6 7 8 9 1 40
Slide 10: Position-Time Graph The Slope is Equivalent to the Average Speed Distance (ft) Vs. Time (sec.) Rise Run
Slide 11: Position-Time Graph How Fast is this Object Moving? Distance (ft) Vs. Time (sec.) Speed = 20ft/sec. Rise 80 ft. Run 4 sec.
Slide 12: Position-Time Graph Distance (ft) Vs. Time (sec.) The Slope of this Line Remains Constant Throughout the Graph The constant slope indicates that the speed of the object remains constant
Slide 13: Position-Time Graph The Speed of This Object Changes Over Time Distance (ft) Vs. Time (sec.) B C A Speed @C = 50 ft/sec Speed @A = 5 ft/sec Speed @B = 24 ft/sec The Object is Accelerating
Slide 14: Average Speed Time Graphs Speed in ft/second Time in Seconds 0 1 2 3 4 5 6 7 8 9 10 30 40 50 20 Describes the speed of an object at specific times and the total displacement but NOT the Direction Study this graph and answer the questions that follow
Slide 15: Speed in ft/second Time in Seconds 0 1 2 3 4 5 6 7 8 9 10 30 40 50 20 How fast was this thing moving, 5 Seconds after it began to move? Hint: It began moving after 1 second Average Speed Time Graphs
Slide 16: Speed in ft/second Time in Seconds 0 1 2 3 4 5 6 7 8 9 10 30 40 50 20 Answer: 40 ft/second Average Speed Time Graphs
Slide 17: Speed in ft/second Time in Seconds 0 1 2 3 4 5 6 7 8 9 10 30 40 50 20 What was the total Displacement of this thing? How far did the thing go during the whole trip? Average Speed Time Graphs
Slide 18: Speed in ft/second Time in Seconds 0 1 2 3 4 5 6 7 8 9 10 30 40 50 20 Answer: This Thing Traveled a total of 175 Feet Distance = Speed x Time. Therefore the total distance is the sum of the areas of each of the 5 rectangles! Try it….It works. Average Speed Time Graphs
Slide 19: Another Difference Between Speed and Velocity Scalar Quantities (One Number) One Gallon
Distance
Speed (MPH)
Voltage Vector Quantities (More Than One Number) Machine Screw Specification (tpi,length,diameter,head style)
Pant Sizes (Waist and Length)
Velocity (Speed and Direction) Velocity is a Vector Quantity Speed is a Scalar Quantity
Slide 20: Vectors Graphically Describe DIRECTION and MAGNITUDE One Foot/sec One Foot/sec One Foot/sec + + = 3 Feet/sec And You can Add and subtract Them!
Slide 21: The Length of a Vector is Proportional to It’s Magnitude 6 Centimeters 6 MPH A Vector Describing a Velocity of 6 MPH is Drawn With a Length of 6 Units 6 Inches Scaling Vectors
Slide 22: Point B Point C Point A Vectors Can Describe Displacement Total Displacement
12.2 miles North East of the Starting Position 10 miles East 7 miles North The Black Dashed Line is called the Resultant The magnitude of the Resultant Vector is found using the Pythagorean Theorem. A2 + B2 = C2
Slide 23: The End Now…….Get Moving!