 | Term | Definition |
| |
speed |
displacement per unit time (ft/sec or m/s) |
| |
velocity |
displacement per unit time in a specific direction |
| |
linear velocity |
velocity measured in ft/sec |
| |
angular velocity |
velocity measured in deg/sec |
| |
acceleration |
the change in velocity per unit time (ft/sec2 or m/s2) |
| |
mass |
the amount of matter contained in an object, measured in slugs or kilograms |
| |
force |
mass x acceleration; a push or pull applied to an object or person, measured in pounds or Newtons |
| |
weight |
the force due to gravity exerted on a mass |
| |
vectors |
arrows drawn on a diagram to represent the location, magnitude, & direction of the force |
| |
normal force |
the force perpendicular to a surface that prevents an object from falling through the surface |
| |
compression |
a smashing force created by at least two pushes |
| |
tension/traction |
created by forces pulling in opposite directions |
| |
distraction |
separation of tissues in the body created by tensile forces |
| |
torsion |
a twisting force, like wringing out a washcloth |
| |
shearing |
created by two opposing forces that are not in line with each other |
| |
torque |
a force that creates rotational movement, =force x moment arm |
| |
friction |
a force that is parallel to a surface and resists movement |
| |
free body diagram |
drawings that show the forces placed on objects or people |
| |
first class lever |
lever where the fulcrum is located between the force and the resistance |
| |
second class lever |
lever where the force & resistance are on the same side of the fulcrum, but the resistance in closer to the fulcrum |
| |
third class lever |
lever where the force & resistance are on the same side, but the force in closer to the fulcrum |
