notes to review forces and motion. important vocabulary

Calculating Speed

Notes to ReviewForces and MotionImportant Vocabulary Check back often, as words will be addedForceMotionDistanceDisplacementPotential EnergyKinetic EnergyTimeSpeedUnitsX-axisY-axisSpeed = distance/timeDistance vs. DisplacementDistance vs. DisplacementDistance is the total length a person or object traveled. Displacement is the shortest distance from the starting position to the end position.For ExampleElvis Andrus hits a triple for the Texas Rangers. Therefore, he runs from home plate to third base.

* His distance is 270 feet (90 feet between each base = 90+90+90)* His displacement is 90 feet (shortest distance is the 90 feet from third base to home)

90909090For ExampleMike Napoli hits a home run for the Rangers.

* His distance is 360 feet (90 feet between each base = 90+90+90+90)* His displacement is 0 feet because he started and ended at the same point. Therefore, the distance between the two is 0 feet.

909090900Potential & Kinetic EnergyPotential energy is the stored energy of an object due to position.Kinetic energy is the energy of an object due to movement.For ExampleClick on the following website for a great animation of this concept!

http://www.teachersdomain.org/asset/mck05_int_rollercoaster/

Calculating Speed Name some timesSecondsMinutesHoursDaysWeeksMonthsYearsMillenium

Name some distancesMillimetersCentimetersMetersKilometersAstronomical UnitsLight Years

Dont swear at your teacher, butInches FeetYardsMilesHow?We can calculate speed with any distance and any time! Just follow the formula!FormulaSpeed = Distance TimeS = d / t

Example: The snail slid his way down the hall. He traveled 6 km in 2 days. What is his speed?S = d / tS = 6 km / 2 daysS = 3 km/dayIt takes 2.0 hr. for Krusty the Clown to drive 20 km through a city during rush hour. What is his average speed?Lets Practice

It takes 2.0 hrs. for Krusty the Clown to drive 20 km through a city during rush hour. What is his speed? Given:

Distance = 20 km

Time = 2.0 hrRelationship: s = d / t

Solution:

S = d / t = 20/ 2 = 10 km/hr

( ** round to the nearest tenth spot ** dont forget units!!!)Looking for:

Speed

15Try againRonald travels North to McDonalds and covers a distance of 36 km. It takes him 6 minutes to get there. What is Ronalds speed?

Ronald travels North to McDonalds and covers a distance of 36 km. It takes him 6 minutes to get there. What is Ronalds speed? Given:

Distance = 36 km

Time = 6 minRelationship: s = d / t

Solution:

S = d / t = 36/6= 6 km/min


Speed

17Who rides his motorcycleunder the sea? Spongebob and Patrick decide to race their motorcycles.A) Spongebob traveled 15 km in 2 minutes. What was his speed? B) Patrick traveled 22 km in 10 minutes. What was his speed?

C) Who won the race?

!!!Spongebob traveled 15 km in 2 minutes. What was his speed? Given:

Distance = 15 km


Solution:

S = d / t = 15/2= 7.5 km/min


Speed

19Patrick traveled 22 km in 10 minutes. What was his speed? Given:

Distance = 22 km


Solution:

S = d / t = 22/10= 2.2 km/min


Speed

20Who Won the Race?

Distance vs Time Graphs

The walker in the graph above is walking at a slower pace than the walker of the graph below. This is seen in that the walker covers a greater distance in a shorter time in the graph below.The walker in the graph above is walking, then comes to a stop. This is seen in the flat line of the graph, the distance does not change. In the graph below, the walker walks away from the origin then turns and walks towards the staring point.Chart1135791197531

Distance (m)Time (sec)Distance (m)

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notes to review forces and motion. important vocabulary

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