Mass Weight Density

Question 1

Recap: Mass and weight what kind of quantities are they?

Answer 1

Mass is scalar, weight is vector

Question 2

Definition of mass

Answer 2

Amount of substance in a body

Question 3

Measuring instruments of mass

Answer 3

Beam balance, electronic balance

Question 4

Definition of weight

Answer 4

Gravitational force acting upon a body

Question 5

Measuring instrument of weight

Answer 5

Spring balance

Question 6

Formula of weight

Answer 6

W=mg

Question 7

Definition of density (scalar)

Answer 7

Mass per unit volume of a substance

Question 8

Unit of density

Answer 8

Kg/m³

Question 9

Formula of density

Answer 9

ρ=m/v or density= mass/volume

Question 10

What is a gravitational field?

Answer 10

It is a region in which a mass experience a gravitational force.

Question 11

Define gravitational field strength (vector)

Answer 11

It’s the gravitational force per unit unit.

Question 12

SI unit of gravitational field strength

Answer 12

N/kg

Question 13

What is the SI unit of acceleration of free fall (vector)

Answer 13

m/s²

Question 14

Define inertia (scalar)

Answer 14

It’s the reluctance of the object to change is state of rest or motion in a straight line.