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Producing motion graphs with a motion sensor

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Producing motion graphs with a motion sensor. A weather radar detects the thunderstorm's position... graphs in real time. computer. motion sensor. connect ... – PowerPoint PPT presentation

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Title: Producing motion graphs with a motion sensor


1
Producing motion graphs with a motion sensor
2
A weather radar detects the thunderstorms
position...
by sensing the microwave signals reflected
back by the clouds.
3
If the time between successive echoes is getting
shorter and shorter,
Which of the following is correct?
A The thunderstorm is leaving.
B The thunderstorm is stationary.
C The thunderstorm is coming.
4
1 Sensing motion
Motion sensor useful for studying motions
5
1 Sensing motion
It emits ultrasonic signals and detects the
echoes from a moving body.
The computer quickly works out about the motion.
6
s-t and v-t graphs in real time
computer
7
2 Reading graphs
The graphs of a trolley running down an inclined
runway.
The body moves away from the motion sensor.
displacement ? more ve
8
2 Reading graphs
The body is moving away from the sensor.
Velocity ve
9
Example 7
The s-t graph of a girl walking in front of a
motion sensor
10
Example 7
Describe the motion of the girl.
11
Example 7
The graph consists of 2 parts AB and BC.
The girl, 2 m away, walks with a velocity of 0.4
m s1 towards the motion sensor.
12
Example 7
The graph consists of 2 parts AB and BC.
On reaching the motion sensor, she walks away at
0.2 m s1.
13
Q1 An s-t graph of a falling...
An s-t graph of a falling ball is generated with
a motion sensor.
To improve the smoothness of the curve,
the sampling rate (number of data taken per
second) should be
A increased.
B decreased.
C fixed.
14
Q2 True or false...
A motion sensor cannot detect an object which is
at rest.
(T/F)
15
(For questions 3 and 4.)
A trolley moves at a constant speed towards the
right along a runway.
A motion sensor starts recording its motion at
the position as shown.
16
Q3 The s-t graph captured...
The s-t graph captured should look like...
A
B
C
D
17
Q4 the v-t graph
The v-t graph captured should look like...
A
B
C
D
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