ES1_Resultant of Forces and Equilibrium of Concurrent, Parallel, Non-concurrent, and Moment

Question 1

Refers to the unit of measurement involving magnitude only

Answer 1

Scalar quantity

Question 2

Refers to the unit of measurement involving magnitude and direction

Answer 2

Vector quantity

Question 3

Scalar or Vector?

mass, speed, volume, temperature

Answer 3

Scalar

Question 4

Scalar or Vector?

force, displacement, velocity, acceleration

Answer 4

Vector

Question 5

A vector classification having defined points of application that cannot be changed without affecting an analysis [e.g. displacement vector with fixed initial point]

Answer 5

Fixed or Bound Vectors

Question 6

A vector classification that may be freely moved in space without changing their effect on an analysis [e.g. velocity vector of points in a body in translational motion]

Answer 6

Free Vectors

Question 7

A vector classification that may be applied anywhere along their line of action without affecting an analysis [e.g. force vector]

Answer 7

Sliding Vector

Question 8

A vector classification having the same
magnitude and direction

Answer 8

Equal vector

Question 9

A vector classification which has the same magnitude and the opposite direction of a given vector

Answer 9

Negative Vector

Question 10

It is characterized by its point of application, magnitude, line of action, and sense.

Answer 10

Force

Question 11

It is equivalent to the diagonal of a parallelogram which contains the two forces in adjacent legs.

Answer 11

Resultant Force

Question 12

R^2= P^2 + Q^2 - 2PQcosB

Answer 12

Law of Cosines

Question 13

When the resultant of all forces acting on a particle is zero, the particle is in ___________

Answer 13

Equilibrium

Question 14

The measure of the tendency of a force F to make the rigid body rotate about a fixed axis perpendicular to the plane of the force F

Answer 14

Moment of a Force

Question 15

The larger the force or the longer the ________ (d) , the greater the moment or turning effect.

Answer 15

Moment Arm

Question 16

SI unit for moment

Answer 16

Nm

Question 17

US unit for moment

Answer 17

lb.in or lb.ft

Question 18

The moment about a given point O of the resultant of several concurrent forces is equal to the sum of the moments of the various forces about the same point O.

Answer 18

Varignon’s Theorem

Question 19

It is made up of two equal, parallel, oppositely directed forces. Sometimes the resultant of a force system will be zero in magnitude and yet have a resultant moment sum

Answer 19

Couples