ENG MECH

static force

study of forces on and in structures that are at rest or moving at a uniform velocity

dynamic force

study of forces acting on a moving body or dynamic equilibrium

vector quantity

something that has both magnitude and direction

scalar quantity

something that has magnitude but no direction

moment

term representing torque which is something producing or tending to produce rotation or torsion

couple

a couple consists of two equal forces, acting in opposite directions and separated by a perpendicular distance

example of static forces

an apple resting on a desk

example of dynamic forces

an ambulance accelerates fast due to emergency

example of vector quantity

force of 5N vertically downward

example of scalar quantity

a boy with a mass of 40kg

example of moment

rotating a nut with a wrench to tighten it

example of couple

the rotation of a steering wheel, pulled down on the left side and pushed up on the right side with equal forces of 5N