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S u g g e s t e d A c t i v i t i e s
5
Angle of Incline versus Efficiency (Constant Force)
Explore the effect of the angle of incline of a track on the efficiency of the Variable Speed Motorized Cart. Measure the speed of the
cart at various angles of incline using a Motion Sensor or Rotary Motion Sensor with the Track String Adapter. One way to mea-
sure the angle of incline is with a Rotary Motion Sensor and a Chaos Accessory (see Figure 5).
Plot the percent efficiency versus the angle of incline, where percent efficiency is:
See Figure 6 for an example of typical experimental results.
Constant Acceleration versus Constant Velocity
Compare the effect of a constant acceleration for measured time
versus constant velocity for a measured time. Use the Time Pulse
Accessory to supply power for a constant time to the Variable
Speed Motorized Cart and compare its motion to that of a Fan Cart
Accessory that has been supplied with power for the same time
period (see Figure 7)
.
Cart
string of Track
String Adapter
Rotary Motion
Sensor
Chaos
Accessory
track
Figure 5: Efficiency vs Angle
mechanical power
electrical power
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100
Figure 6: Typical Data
Figure 7: Constant Acceleration versus Constant Velocity
Motorized
Cart
cart
Fan Cart
Accessory
Time Pulse
Accessory
Time Pulse
Accessory
tracks
