One reason the underhand serve is so rare is a matter of simple physics: Given the dimensions of a tennis court, you can exert greater force and spin on an object by hitting downward in a fairly straight line than upwardly parabolic.
In water, buoyancy acts against the body to reduce the load at the joints, while water viscosity requires the subject to exert greater force than when moving on land [ 4].
The "intelligent clothing" will use artificial muscles made from smart materials and reactive plastic-like molecules capable of exerting great forces.
Line charge exerts greater force when close to the line, but the force decreases inversely proportional to distance as you move away from the charge.
¥ For a given deflection, straight archwires exerted greater force with respect to mushroom wires (UMW and LMW) of the same section and alloy (Fig. 5).
A comparison of the forces exerted by straight and mushroom archwires showed that: ¥ For a given deflection, straight archwires exerted greater force with respect to mushroom wires (UMW and LMW) of the same section and alloy (Fig. 5).
At baseline obese subjects exerted greater force to see highly rewarding foods despite no difference in their subjective liking for the foods.
Indeed, this is the case in male tree weta, Hemideina spp., which have larger heads, greater adductor muscle volume and exert greater bite force than females [69].
Kinematic data support the expectations from the morphological analysis that limnetic stickleback exhibit faster strikes and greater jaw protrusion than benthic fish, whereas benthics exert greater suction force on attached prey.
Therefore, the pennate muscle can exert a greater force but cannot shorten a great deal; the parallel-fibred muscle can exert only a relatively small force but can shorten significantly.
Rapidly changing currents exert a greater force on domain walls than do slowly changing ones.For the technology to work like a disk, though, the same bits of data will have to pass repeatedly under the reading and writing heads.
