This website is helpful because it displays an explanation for an excellent equation for measuring the shape and weight of nano-objects such as viruses. The equations are made by professor John Sader at the University of Melbourne. It explains that it will require more force to push heavier objects. If you accelerate a particle you measure how fast it goes to figure out the mass. That is called (MS). This website is a bit complicated but it helps you realize how math is used to measure nano-objects/ particles.