Dynamics-Mass, Weight and Density

Question 1

What is mass?

Answer 1

A measure of the amount of substance/matter of an object (Scalar)
SI Unit: kg

Question 2

What is inertia?

Answer 2

The reluctance of a mass to change its current state (at rest or in uniform speed)

The larger the mass, the larger the inertia and it acts in the opposite direction of the acting force

Question 3

What is weight?

Answer 3

The gravitational force acting on an object in a gravitational field dependent on distance (Vector)
W=mg (mass x gravitational field strength)
SI Unit: N

Question 4

What is the formula for gravitational field strength and what is earth’s gravitational field strength

Answer 4

g= gravitational force/mass
SI Unit: m/s^-2 OR Nkg^-1
Earth- 10m/s^-2

Question 5

What is density?

Answer 5

Density is the amount of mass per unit volume
p= m/v
SI Unit: kgm^-3
Unit: Pa (Pascals)

Question 6

What is the formula for average density?

Answer 6

Average density= total mass/total volum