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
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.
DISTANCE - the total path length traversed by an object moving from one location to another
- a scalar quantity which has only magnitude.
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2. DISPLACEMENT- refers to the straight line distance between the starting and end points. - a vector quantity which has both magnitude and direction
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Distance and Displacement START FINISH Need to distinguish how long we traveled from how far away (and in what direction) we traveled.
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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 .
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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
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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.
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 .
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Assume that the speed of sound in air is 340 m/s and light was seen instantaneously. How far away was the lightning bolt?
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2. A car starts from rest and attains a speed of 50m/s in 15 seconds.
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)
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