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Forces and Motion Science Fair Project

Investigating Friction Loss in DC Motors

Investigating Friction Loss in DC Motors | Science Fair Projects | STEM Projects
We're going to investigate how the power and size of a DC motor affects the amount of energy lost due to friction. We'll measure the voltage, current, and time taken for the motor to stop after the power is turned off.


The hypothesis is that friction loss in a DC motor will increase as the power and size of the motor is increased.

Method & Materials

You will select four different ratings of DC motors from the same series and manufacturer. You will measure the input current and DC voltage at the motor input. You will calculate the power supplied to the motor and switch off the power. You will start a stopwatch and record the time needed for the motor to stop.
You will need a DC 24V, 500W power supply, a DC 24V, 30W servomotor, a DC 24V, 50W servomotor, a DC 24V, 70W servomotor, a DC 24V, 100W servomotor, a multi meter, an ammeter, and a stopwatch.


Our experiment showed that as the motor rating and size increases, the amount of friction power increases.

Why do this project?

This science project is interesting because it allows us to explore how the power and size of a DC motor affects the amount of energy lost due to friction.

Also Consider

Consider repeating the experiment to compare the efficiency of motors. Consider repeating the experiment using AC motors.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

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