motion,
movement the act of changing location from one place to another; "police controlled the motion of the crowd"; "the movement of people from the farms to the cities"; "his move put him directly in my path"
bouncing,
bounce the quality of a substance that is able to rebound
resilience,
resiliency the physical property of a material that can return to its original shape or position after deformation that does not exceed its elastic limit
backlash -
The distance through which one part of connected machinery, as a wheel, piston, or screw, can be moved without moving the connected parts, resulting from looseness in fitting or from wear.
backlash -
The jarring or reflex motion caused in badly fitting machinery by irregularities in velocity or a reverse of motion.