Mechanics

Question 1

scalar

Answer 1

only magnitude

Question 2

vector

Answer 2

magnitude and direction

Question 3

scalar examples

Answer 3

• distance
• tempurature
• speed
• mass

Question 4

vector examples

Answer 4

• displacement
• velocity
• force/weight
• acceleration

Question 5

moments

Answer 5

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

Question 6

couple

Answer 6

a pair of coplanar forces, where the two forces are equal in magnitude but act in opposite directions

Question 7

coplanar

Answer 7

forces in the same plane

Question 8

principle of moments

Answer 8

for an object to be in equilibrium, the sum of anticlockwise moments about a pivit us equal to the sum of clockwise moments

Question 9

center of mass

Answer 9

a points at which an objects mass acts

Question 10

newtons 1st law

Answer 10

an object will remain at rest or travelling at constant velocity, until it experiences a resultant force

Question 11

newtons 2nd law

Answer 11

the acceleration of an object is proportional to the resultant force experienced by the object

Question 12

newtons 3rd law

Answer 12

for each force experienced by an object, the object exerts an equal an opposite force

Question 13

momentum

Answer 13

product of mass and velocity

Question 14

elastic collisions

Answer 14

momentum and kinetic energy are conserved

Question 15

inelastic collisons

Answer 15

only momenttum is conserved

Question 16

conservation of energy

Answer 16

enegry cannot be created or destroyed, but transferred from one form to another