TORQUE AND CENTER OF GRAVITY

Question 1

An external force directed through the center of gravity of an object is called

Answer 1

centric force

Question 2

The effect of a centric force is to cause a change in

Answer 2

linear motion

Question 3

An external force not directed through the center of gravity of an object is called an

Answer 3

eccentric force

Question 4

The effect of an eccentric force is to cause a change in the

Answer 4

linear and angular motion

Question 5

what is a force couple

Answer 5

A pair of forces equal in size but opposite in direction and noncolinear

Question 6

what is a force couple

Answer 6

A pair of forces equal in size but opposite in direction and noncolinear

Question 7

The effect of a force couple is to cause a change only in

Answer 7

angular motion

Question 8

why there’s is no change in linear motion with a force couple

Answer 8

The resultant of the two forces in a force couple is a force of zero, so according to Newton’s first and second laws, no change in linear motion occurs

Question 9

. The torque produced by the force couple causes the object to

Answer 9

rotate

Question 10

torque is directly related to the _ of the force that creates it

Answer 10

size and the distance between the line of action of the force and the point about which the object tend to rotate

Question 11

does tThe torque produced by a force depend on the force alone

Answer 11

no

Question 12

A torque that causes counterclockwise rotation is

Answer 12

positive

Question 13

A torque that causes clockwise rotation is

Answer 13

negative

Question 14

A torque that causes clockwise rotation is

Answer 14

negative

Question 15

A net force of zero ensures that no change will occur in the _ motion of an object, but it does not constrain the object’s _ motion.

Answer 15

linear, angular

Question 16

what do we need to have if we want to have no angular motion

Answer 16

The net torque acting on an object must be zero to ensure that no changes occur in the angular motion of the object

Question 17

For an object to be in static equilibrium, the external forces must sum to _ and the external torques (about any axis) must sum to _ as well.

Answer 17

0

Question 18

what is the def center of gravity

Answer 18

Center of gravity is the point in a body or system around which its mass or weight is evenly distributed or balanced and through which the force of gravity acts

Question 19

what happen with the center of gravity if you raise your arm in front of you

Answer 19

it will move forward slightly

Question 20

what happen with the center of gravity you reach overhead with both arms,

Answer 20

it will move upward slightly

Question 21

Someone with long legs and muscular arms and chest has a _ center of gravity than someone with shorter, stockier legs

Answer 21

Someone with long legs and muscular arms and chest has a higher center of gravity than someone with shorter, stockier legs

Question 22

women center of gravity is _ compare to men and why

Answer 22

. A woman’s center of gravity is slightly lower than a man’s because women have larger pelvic girdles and narrower shoulders relative to men.

Question 23

Raising one leg out in front of you will move your center of gravity _ and _ farther than will raising one arm out in front of you

Answer 23

upward and forward