# Speed, Torque, and Power

# VEX IQ Curriculum - Key Concepts

## Speed, Torque, and Power

**Speed** is a way of measuring how fast an object is moving. Speed measures how far an object will travel over a given period of time. This measure is given in units of distance per time such as Miles per Hour or Feet per Second.

**Torque** is a force directed in a circle, most often rotating an object. Torque is a spinning force. When torque is spinning an object, the object will create a linear (straight line) force at its edge, such as an axle spinning a tire and causing the tire to move in a straight line along the ground. Torque is measured in units of force × distance, such as Inch-Pounds or Newton-Meters.

**Power** is the rate at which work is done. With VEX IQ, Smart Motors convert electrical energy into mechanical energy and produce power for a mechanical system. Power is most commonly measured in Watts.

The physical principles of Speed, Torque, and Power all fit together in what engineers call **Classical Mechanics**. In Classical Mechanics, speed and torque have an inverse (or opposite) relationship – as one increases the other decreases. Higher speed means lower torque, and higher torque means lower speed.

Also, the amount of power supplied has an effect on how much speed and/or torque can be produced in a mechanical system.