definitions

Question 1

scalar

Answer 1

physical quantity with magnitude only

Question 2

vector

Answer 2

physical quantity with magnitude and direction

Question 3

displacement

Answer 3

distance measured in a straight line from the beginning to end (specified direction)

Question 4

distance

Answer 4

total length travelled by a moving object regardless of the 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

amount of matter in an object

Question 9

weight

Answer 9

amount of gravitational force acting on a body of mass

Question 10

gravitational force

Answer 10

reigion where a body of mass expericnece a gravitational attraction

Question 11

gravitational field strength

Answer 11

gravitational force experienced by unit mass

Question 12

newtons 1st law

Answer 12

every object will stay at rest or in motion unless acted on by another force

Question 13

newtons 2nd law

Answer 13

resultant force results in an acceleration in the direction of the resultant force. F=ma

Question 14

3rd law

Answer 14

if body a exerts a force on bod b, body b will exert an equal and opposite force on a

Question 15

moment of a force

Answer 15

a product of force and perpendicular distance from the pivot to line of action

Question 16

principle of momnts

Answer 16

when an object is in equilibrium, its clockwise and anticlockwise moments around a point are equal

Question 17

conditions for equilibruim

Answer 17

no net force acting on object
no net moment about any point

Question 18

centre of gravity

Answer 18

theorethical point where the entire weight of an object appears to act.

Question 19

1st formula for kinmatics

Answer 19

a = v-u/t

Question 20

2nd formula

Answer 20

s = u+v/2 t

Question 21

3 formula

Answer 21

v^2 = u^2 + 1/2 as

Question 22

4 law

Answer 22

s = ut + 1/2 at^2