So that's what we mean by the size of the motor unit affects the magnitude of the force that is produced by that particular motor unit. Now let's move on to number two. So number two states that the number of motor units involved also affects the magnitude of the force that is produced. That means if we have more of these motor units that are involved in creating that motion, we're going to produce a greater force. Likewise, if we have less of these motor units involved we're going to produce a smaller force. Now to see what we mean, let's take a look at the following diagram once more.