Energy: Week 2: Pendulums and LEDS

First is our pendulum from last week:

Measurements of our pendulum: 1 pound, 24 inches, 2 mins:

Estimated Actual Energy of our Pendulum: 2.7 Joules

Average power of Actual Pendulum : 0.0225 Watts

Power of our pendulum over 10 seconds : 0.27 Watts

If we had dropped the pendulum from its maximum height:

Full potential:  1 pound, 3mins, 100 inches:

Full Potential Energy of our Pendulum: 11.3 Joules

Power over 3 mins: 0.067 Watts

Power over 2 mins: 0.094 Watts

Power of our pendulum over 10 seconds : 1.13 Watts

For the Energy conversion worksheet we used this set up of a DC motor powered by an electric hand mixer to power an LED.  I think the motor is the same as the DC motor  I used for our wheel/ axel.

Worksheet:

Energy Converter (eg “small stepper”):  Small DC motor

Measured Open Circuit Voltage (V) : about 3 V. ( 2.92, double checked on a multimeter)

Measured Short Circuit Current (mA): about 160 mA

Kinetic circuit:

First using a DC motor from the junk shelf we hooked up 2 LEDs to a breadboard. Red LED for one direction, green for the other.

We then attached wheels to two motors and attached the motors to eachother and 4LEDS (of) to make a kinetic wheel/ spool