Motion speed- and velocity
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Transcript of Motion speed- and velocity
MOTION Level Middle Students
By Subhash Jain
WHAT IS MOTION? In physics, motion is a change in position of an object
with respect to time and its reference point. Motion is typically described in terms of displacement, direction, velocity, acceleration, and time.
• Start and end position? • Movement relative to what?• How far did it go? And in what direction did it go?
B A20 m 15 m 10 m 5 m 0
20 sec 15 sec 10 sec 5 sec 0 sec
WHAT IS SPEED?Speed is the distance an object travels in a certain amount of time.
To calculate speed, you use the following formula: Total Distance covered
(d)
Speed (v) = -----------------------------------
Total Time taken (t)eg. Suppose the horse ran 20 m in 20 sec. What is the speed of horse?
20 – 0 = 20 m
Speed (v) = -------------------- = 1 m/sec
20 – 0 = 20 sec
GRAPH THE FOLLOWING DATA
00 05 10 15 20
00 05 10 15 20
Distance in meterTime in second
0 5 10 15 20 250
5
10
15
20
25
Time in second
Dis
tance in m
ete
r
VELOCITYVelocity is the speed of an object, but the direction is also included. It is calculated the same as speed, but you must include a direction in your answer.
Example: the bass boat is moving 100 km / h toward the north.
North
Indicate which of the following are velocities:
a. 125 cm/secb. 30 km/h northwestc. 350m/sec northd. 520 km/h