Parallel forces

when the lines of action of a number of forces acting on a body are parallel, they are said to form a system of --------------

When parallel forces are in the same direction, it is a system of ---------------

• like parallel forces

• unlike parallel forces

When parallel forces act in the opposite direction, it a system of

• like parallel forces

• unlike parallel forces

Resultant of like parallel forces P and Q is

• P + Q

• P - Q

The resultant of two unlike parallel forces P and Q (P>Q) is

• P + Q

• P - Q

Two equal and unlike parallel forces acting on a body whose lines of action are different constitute a couple

The moment of the couple is equal to the product of one of the forces and the perpendicular distance between the lines of action of the forces

• True

• False

The equation for work done by a couple in one second is

• 2 $\pi$ N C

• 2NC

• 2 $\pi$ N