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The force on the beads may be controlled by moving the magnets along the vertical axis. Moving them up decreases the field strength at the position of the bead and vice versa. Torques on the magnetic beads may be exerted by turning the magnets around the vertical axis to change the direction of the field.
The gradient force will trap the particles in the transverse direction, while the axial optical force comes from the scattering force of the two counter propagating beams emerging from the two fibers. The equilibrium z-position of such a trapped bead is where the two scattering forces equal each other.
The chain fountain phenomenon, also known as the self-siphoning beads, Mould effect, or Newton beads is a physical phenomenon observed with a chain placed inside a jar. One end of the chain is pulled from the jar and is allowed to fall under the influence of gravity .
Prince Rupert's drops have remained a scientific curiosity for nearly 400 years due to two unusual mechanical properties: [4] when the tail is snipped, the drop disintegrates explosively into powder, whereas the bulbous head can withstand compressive forces of up to 664,300 newtons (67,740 kg f).
Bead constrained to move on a frictionless wire. The wire exerts a reaction force C on the bead to keep it on the wire. The non-constraint force N in this case is gravity. Notice the initial position of the bead on the wire can lead to different motions. Simple pendulum.
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Force spectroscopy is a set of techniques for the study of the interactions and the binding forces between individual molecules. [1] [2] These methods can be used to measure the mechanical properties of single polymer molecules or proteins, or individual chemical bonds.
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