principles

Question 1

weight is balanced when the __________ above the base provided by the ______

Answer 1

center of gravity, feet

Question 2

a person or an object is more _____ if the center of gravity is _____ to the ______ of support

Answer 2

stable, close, base

Question 3

enlarging the base of support in __________ to be applied _____ the amount of force that can be applied

Answer 3

direction of the force, increases

Question 4

_____ or contract your supporting muscles before _____ a lifting task to prevent injury

Answer 4

tighten, beginning

Question 5

_____ in the direction of the task to be performed and turning the ________ in ________ lessens the susceptibility of the back to injury

Answer 5

facing, entire body, one plane

Question 6

lifting should be undertaken by __________ and using the __________ rather than by using the back muscles

Answer 6

bending the legs, leg muscles

Question 7

it takes less energy to move an object on a __________ than to move it up a __________ against the force of gravity

Answer 7

level surface, slanted surface

Question 8

________ is required to move an object when the _____ between the object and the ______ on which it rests is minimized

Answer 8

less energy, friction, surface

Question 9

it takes less energy to hold an object ______ to the body than at a ______ from the body

Answer 9

close, distance