1.1 basic physics

Question 1

scalar quantity

Answer 1

a quantity that only has magnitude

Question 2

vector quantity

Answer 2

a quantity that has both magnitude ad direction

Question 3

a moment

Answer 3

= the turning force
force x perpendicular distance from the point to the line of action of the force

Question 4

principle of moments

Answer 4

for an object to be in equilibrium, the um of the ac- moments would be equal to the sum of cw-moments

Question 5

center of gravity

Answer 5

the point at which all the weight of an object acts. for a uniform object, the center of gravity is the geometric centre

Question 6

homogenous

Answer 6

the units are the same on each side of the equation
units of LHS = units of RHS

Question 7

is mass scalar or vector

Answer 7

scalar

Question 8

is distance scalar or vector

Answer 8

scalar

Question 9

is speed scalar or vector

Answer 9

scalar

Question 10

is displacement scalar or vector

Answer 10

vector

Question 11

is velocity scalar or vector

Answer 11

vector

Question 12

is acceleration scalar or vector

Answer 12

vector

Question 13

is force scalar or vector

Answer 13

vector

Question 14

what to consider when adding vectors

Answer 14

direction

Question 15

what is a coplanar vector

Answer 15

vectors which are acting in the same as each other.

Question 16

the weight of a body on an inclined plane

Answer 16

Component down the slope = W sinθ
Component at right angles to the slope = W cosθ

Question 17

tera, T

Answer 17

10^12

Question 18

giga, G

Answer 18

10^9

Question 19

mega, M

Answer 19

10^6

Question 20

kilo, k

Answer 20

10^3

Question 21

milli, m

Answer 21

10^-3

Question 22

micro, μ

Answer 22

10^-6

Question 23

nano, n

Answer 23

10^-9

Question 24

pico, p

Answer 24

10^-12

Question 25

two conditions must be satisfied for a body to be in equilibrium

Answer 25

1. there is no resultant force in any direction 2. there is no net moment about any point.

Question 26

Using the principle of moments equation, (no net moment)

Answer 26

total anticlockwise moment = total clockwise moment

Question 27

Using the condition that there is no resultant force equation

Answer 27

total force up = total force down

Question 28

for an object to be in equilibrium it is…

Answer 28

not accelerating: - stationary - moving at constant velocity

Question 29

volume

Answer 29

length x width x height m x m x m = m³

Question 30

density

Answer 30

mass / volume kg / m³ ​= kg m−3

Question 31

velocity

Answer 31

displacement / time m / s = ms-1

Question 32

acceleration

Answer 32

change in velocity / time ms-1 / s = ms-2

Question 33

force

Answer 33

mass x acceleration kg x ms-2 = kgms-2

Question 34

mass m

Answer 34

kilogram kg

Question 35

length L

Answer 35

metre m

Question 36

time t

Answer 36

seconds s

Question 37

electric current I

Answer 37

ampere A

Question 38

temperature T

Answer 38

kelvin k

Question 39

amount of substance

Answer 39

mole mol