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# Motion speed and velocity

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• 1. Mechanics
• 2. MECHANICS
• the sub branch of classical physics that is concerned with the forces acting on bodies , whether at rest or in motion.
• is divided into statics, kinematics and dynamics
• 3.
• STATICS - focuses on the way in which forces combine with each other so as to produce equilibrium .
• 4.
• KINEMATICS - focuses on the motion of a body without regard to the cause of that motion
• 5. DYNAMICS - focuses on the way in which forces produces motion.
• 6.
• MOTION
• defined as the movement of an object
• exhibited by a change in position
• 7. Motion or Movement is a Change In Position 10 ft. Position A Position B
• 8. There are many ways of describing motion: 1. Rectilinear motion- the motion of an object traveling at a straight path. 2. Curvilinear motion- an object traveling in a curved path 3. Angular motion - an object traveling at certain angles
• 9.
• MOTION IS RELATIVE
• it may be described by specifying how far something has traveled in changing position and time.
• a reference frame is a physical entity such as the earthâ€™s surface, the deck of a ship or a moving vehicle to which the position and the motion of an object is relative.
• 10.
• DISTANCE AND DISPLACEMENT
• DISTANCE - the total path length traversed by an object moving from one location to another
• - a scalar quantity which has only magnitude.
• 11. 2. DISPLACEMENT- refers to the straight line distance between the starting and end points. - a vector quantity which has both magnitude and direction
• 12. Distance and Displacement START FINISH Need to distinguish how long we traveled from how far away (and in what direction) we traveled.
• 13. 2 Displacement and distance your home your school A displacement has Size = length of this arrow displacement from home to school To go to school from home... size & direction .
• 14. 2 Displacement and distance Distance = length of path you travelled ( ï‚¹ size of displacement ) l 1 l 2 l 3 To go to school from home... your home your school = l 1 + l 2 + l 3
• 15. Suppose we have two towns A and B 10 km apart on either side of a hill.Â  They are joined by a railway line that is straight, and goes through the hill in a tunnel.Â  The road goes round the hill and the total journey distance is 25 km.
• 16.
• 17. So the distance is 25 km.Â  The displacement (the straight-line distance in a particular direction) between A and B is 10 km due East.
• 18. If we go from A to B and back again, the distance is 50 km, but the displacement is 0.
• 19.
• SAMPLE PROBLEM:
• On his way to school, Jed traveled 100 m North, 300 m East, 100 m North, 100 m East , 100 m North.
• a. Find the total distance traveled by Jed.
• b. Determine the displacement made by Jed.
• 20.
• SPEED AND VELOCITY:
• SPEED- a scalar quantity which measures how fast something is moving.
• 21. SPEED-the rate at which distance is covered at a given time
• 22. average speed- defined as the total distance traveled divided by the time it took to travel the distance.
• 23. the speed of a body at any instant. Instantaneous speed
• 24.
• VELOCITY- a vector quantity that represents a rate of change of displacement.
• 25. Problems: 1. Rachel watches a thunderstorm from her window. She sees the flash of lightning bolt and begins counting the seconds until she hears the clap of thunder 5.0 seconds later .
• 26. Assume that the speed of sound in air is 340 m/s and light was seen instantaneously. How far away was the lightning bolt?
• 27. 2. A car starts from rest and attains a speed of 50m/s in 15 seconds.
• 28. How far has the car traveled in 15 seconds?
• 29.
• A car traveled at 88 km/hr for 5 hours. How far did it travel?
• 30.
• Justin walks 5 km/hr. How long did it take him to travel 15 km?
• 31. 6. A car travels a distance of 40 km from Manila to a town in Laguna. What is its average speed (in km/hr) if traveling time is from 7:00 A.M. to 7:30 A.M.? its average velocity (km/hr).
• 32. Suppose that after a business talk with a friend , the driver of the car drives straight back to Manila from 11:55 A.M. to 12:20P.M.What was the car,s average speed (km/hr) during the roundtrip? its average velocity (km/hr)