Chapter 4: Forces Flashcards
(10 cards)
Define field of force
A field of force is a region of space at which a force acts on a body
Define centre of gravity
The centre of gravity of a body is defined as the single point at which the whole weight of the body may be considered to act
Define translational equilibrium
A body is in translational equilibrium if the sum of the forces acting on the object in any direction is zero
Define moment
The moment of a force about a point is the product of the force and the perpendicular distance of the line of action of the force to the pivot
Define torque
The torque of a force is the product of one of the forces and the perpendicular distance between the forces
What’s the conditions for rotational equilibrium?
A body is in rotational equilibrium if there is no resultant torque about any point
State the principle of moments
The principle of moments states that the sum of clockwise moments about a pivot is equal to the sum of anticlockwise moments about the same pivot.
State the conditions for equilibrium
A body is in equilibrium if the sum of the forces acting on the body in any direction is zero and the sum of the moments of the forces acting on the body about any point must be zero.
Define pressure
Pressure is defined as the force acting on an object per unit area
Define upthrust
Upthrust is defined as the net upwards force exerted by a fluid on a submerged or floating object. It arises due to the difference in pressure between the upper and lower surfaces of the object.
