statics

Question 1

centre of mass

Answer 1

a body behaves as if all the mass was concentrated in the centre of mass

Question 2

centre of gravity

Answer 2

a body behaves as your weight is focused on a point known as the centre of gravity. this is the same as the centre of massif the body is in a uniform gravitational field

Question 3

closed triangle of vectors

Answer 3

if the result force of a set of vectors is zero then if the vectors are draw to scale tip to end they should from a closed parallelogram of triangle

Question 4

couple

Answer 4

two forces equal in magnitude but in opposite direction

Question 5

density

Answer 5

mass per unit volume

Question 6

equilibrium

Answer 6

if the sum of the forces and the sum of the moments equals zero then the body is at equilibrium

Question 7

lever

Answer 7

a machine make up of a ridged structure pivoted at one point. an effort force is applied to a lever to apply a force to the load. the lever my be a force multiplier of a distance multiplier if the load if further away from pivot then the effort

Question 8

mass

Answer 8

the amount of matter kg

Question 9

moment

Answer 9

the moment of a force about a point is the force multiplied by the perpendicular distance from the line of action of the force to the point

Question 10

couple

Answer 10

two forces that act on the same plane where the two forces are equal in magnitude but act in opposite directions

Question 11

moment equation

Answer 11

force x perpendicular distance to the line of action of a force from the point

Question 12

moment of a couple

Answer 12

multiply one of the forces by the perpendicular distance between the lines of action forces

Question 13

principle of moments

Answer 13

for an object in equilibrium the sum of anticlockwise moments about a pivot is equal to the sum of clockwise moments