Definitions

Question 1

scalar

Answer 1

physical quantity having magnitude only

Question 2

vector

Answer 2

physical quantity having both magnitude and direction

Question 3

distance

Answer 3

total length covered by a moving object regardless of the direction of motion

Question 4

displacement

Answer 4

distance measured in a straight line in a specified direction

Question 5

speed

Answer 5

rate of change of distance

Question 6

velocity

Answer 6

rate of change of displacement

Question 7

acceleration

Answer 7

rate of change of velocity

Question 8

mass

Answer 8

a measure of the amount of matter in a body

Question 9

weight

Answer 9

amount of gravitational force acting on a body

Question 10

gravitational field

Answer 10

region in which a body with a mass experiences a gravitational force

Question 11

gravitational field strength

Answer 11

gravitational force experienced by a unit mass

Question 12

inertia

Answer 12

reluctance of an object to change its state of rest or motion

Question 13

moment

Answer 13

product of the force (F) and the perpendicular distance (d) from the pivot to the line of action of the force

Question 14

principle of moments

Answer 14

when a body is in equilibrium, there is no resultant force acting on the body, and the sum of clockwise moments about a point is equal to the sum of anticlockwise moments about the same point

Question 15

centre of gravity

Answer 15

the point at which the entire weight of the object appears to act, for any orientation of the object