Download Presentation
## Unit 6 PS

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -

**Unit 6 PS**Standard PS 5**Drill Panther**Copy down the Speeds of Animals MAKE A BAR GRAPH WITH THESE ANIMALS AND THEIR SPEEDS ON IT Animal Name on X axis Pig 11 mph Mouse 8 mph Six-lined race runner 18 mph Elephant 25 mph Moose 35 mph Lion 50 mph BAR GRAPH**Panther Drill**Copy this equation: This how to figure out your speed in miles per hour 75 ft X 1 mile X 3600 sec your 5280 ft 1 hr**Your SPEED**Speed = Distance divided by time For us today: ft/sec**Unit 6 Motion**Motion: movement of an object from a fixed point. Fixed point is called the reference point (this is the starting line)**Distance**Distancehow far something has moved. IE How far you drive in your car. It is only a number or amount. For instance LCHS is exactly 61.3 miles from my door to the parking lot. This is distance.**Displacement**Displacement: is a distance and a direction. For example to get to the deer stand in the woods I had to walk 1500 yards North west from the road. Total or Final Displacement: change in position from the starting point. LOOK AT EXAMPLE ON THE NEXT SLIDE**Total displacement**You travel: 6 miles east then 3 miles west A 6 miles E 3 miles W Total displacement (distance from where you started) = 6 miles – 3 miles = 3 miles. You am now 3 miles from your house.**Panther Drill**What is the difference between speed and velocity?**Speed**Speed: the distance traveled per unit of time. Speed (s) = distance (d)/time (t) s=d/t meters/sec Different speeds Cruise control on a empty road= constant speed Bumper to bumper traffic = changing speed, your speed is fast, then slower, then faster, then slower ect**Speed and Velocity**Speed: we already know is the distance traveled in a given unit of time. Measured for science in meters per second. Can also be mph Velocity: speed with direction22 m/sec SE IE: You have to walk 2.8 mph NW from the road into the woods to the deer stand.**You are here**Speed = 22 mph Speed = 22 mph Velocity = 22 mph NorthWest Velocity = 22 mph North East Who cares? You should. The red case means your butt could be toast!!! Hurricane coming right at us!!!!!! The purple case velocity means surfs up dude!!! Hurricane Fran 1996**Different speeds**Constant Speed:when speed is unchanged. like cruise control in the car. Changing speed: speed is not constant or consistent. Like stop and go traffic. Average Speed:used when speed is changing, = s (avg) = Total Distance Traveled Total time spent traveling**Different speeds 2**Instantaneous Speed: Speed at any given time, only true at that instant it is observed. Instantaneous Speed Ferrari Enzo 0-60 time 3.3 secs. The speed at any time over that 3.3 seconds would be different.**Exit**Explain the difference between speed and velocity.**Panther Drill**If the formula for speed is s=d/t, write down how to find distance and how to find time, using the same equations. t = d/s d = sxd**Vid Clip**VIDEO**Acceleration**Acceleration: (a)the rate of change in velocity per unit of time Original or Initial Velocity= 20 m/sec Final velocity = 80 m/sec Time = 2 sec Acceleration = Velocity(final) - Velocity(original) time 80m/s – 20m/s a = 2 sec 60m/s / 2 sec a = 30 m/sec**A car traveling at 60 mph accelerates to**90 mph in 3 seconds. What is the car’s acceleration? Velocity(final) - Velocity(original) = Acceleration time 90 mph - 60 mph = 3 seconds 30 mph = 3 seconds = 10 mph/second**Acceleration Units**The Unit for Acceleration in science is meters per second per second or m/s2 a = V final – V Initial m/s time s**Panther Drill**If you are traveling at 4 m/sec and then speed up to 12 m/s in a period of 5 seconds. What is your acceleration**Panther Drill**Velocity in m/s Seconds Use the graph to find out what is the acceleration between 3 seconds and 7 seconds Extra Credit: What is the slope of the line?**PD Answer**Acceleration (a) = Vf – Vi t time = 7 sec – 3 sec = 4sec 14 – 6 = 8/4 = 2 m/s2 4 Vf = 14 m/s Vi = 6 m/s**Extra Credit**Slope: m= (y1-y2) (X1-X2) 3 – 7 = 6-14 -4/-8 m = 2**??QUESTION??**Is the acceleration changing when you look at the graph? At what kind of rate, changing or constant? What do you see when you compare the slope with the acceleration? They are = Slope of the line = the acceleration!!!! Yes Constant**Example**Joval and Justice pull up to each other at a stop light. They decide to race. The 2 cars accelerate as a traffic light turns green. In 5 seconds, Joval (car 1) goes 0-40km/hr and Justice (car 2) goes 0-50 km/hr. Which car accelerates the fastest?**You do car #2**What is its acceleration?**Panther Drill**Define the following: • Constant acceleration • Changing acceleration • Positive acceleration • Negative Acceleration**Positive and Negative Acceleration**Positive acceleration: speeding up Negative acceleration: slowing down Velocity is still in the same direction Velocity Acceleration Velocity Acceleration**Graphing**Positive acceleration Negative acceleration**The area in red is where constant velocity occurs.**Here there is 0 acceleration**Changing Acceleration**In changing acceleration the graph is not a straight line with a constant slope. Changing acceleration is speeding up or slowing down.**Work**Lets check it: Vi = 22 Vf = 22 t = 7 (10-3 sec) 22-22 = 0/7 = 0m/s2 7**Graphing**Draw a sketch of positive, negative, constant, and zero acceleration on graph paper. Label each sketch. Make sure you title the sketches and tell me what each axis measures.. Divide the graph paper in into quarters. Put each graph in a separate ¼ of the paper.**Exit Assignment**Circle the area where there is positive, negative, and 0 acceleration.**Monday**Students will construct time-distance graphs PS 5.6 Represent the linear motion of objects on distance-time graphs.**Panther Drill**In your own words describe Distance Displacement Speed Velocity**PRACTICEOn your graph paper graph the following data**Compare the speed of the 2 objects on a graph