ch 8

Question 1

static equilibrium

Answer 1

state of equilibrium in which the net external force and torque acting on a system is zero

Question 2

dynamic equilibrium

Answer 2

a state of equilibrium in which the net external force and torque on a system moving with constant velocity are zero

Question 3

TORQUE and why is it necessary ?

Answer 3

The second condition necessary to achieve equilibrium involves avoiding accelerated rotation (maintaining a constant angular velocity. A rotating body or system can be in equilibrium if its rate of rotation is constant and remains unchanged by the forces acting on it. To understand what factors affect rotation, let us think about what happens when you open an ordinary door by rotating it on its hinges.

Question 4

Torque

Answer 4

rotational form of force

Question 5

center of gravity and its concept in torque

Answer 5

which is the point where it is assumed that the gravitational force acts on the object. For objects where the acceleration due to gravity does not change over the size of the object, the center of gravity is located at the same point as the center of mass

Question 6

perpendicular lever arm

Answer 6

the shortest distance from the pivot point to the line along which FF lies

Question 7

unit of torque

Answer 7

Nm