forces in action

Question 1

define drag

Answer 1

A frictional force that opposes motion

Question 2

what is meant by terminal velocity

Answer 2

When weight = drag and the acceleration becomes zero

Question 3

principle of moments

Answer 3

when in equilibrium the SUM OF THE clockwise moments are equal to the anticlockwise moments

Question 4

moment

Answer 4

the product of the force and the perpendicular distance about a pivot

Question 5

couple

Answer 5

A pair of equal and opposite coplanar forces that have equal magnitude and opposite direction, applied to a body parallel to each other but not along the same line

Question 6

pressure

Answer 6

the normal force exerted on a surface per unit area
1Pa = 1Nm^-2

Question 7

force that an object submerged in a fluid experiences

Answer 7

upthrust as the pressure at the bottom surface of the object is greater that at its top surface

Question 8

Archcimedes principle

Answer 8

Upthrust is equal to the weight of the fluid displaced