Mass, Weight and Density

Mass
1. Defined as a measure of the amount of substance in a body
2. SI Unit: Kilogram; kg
3. The magnitude of mass depends on the size of the body and the number of atoms in the body.
4. Scalar quantity
Inertia
1. Defined as resistance of the body to change in its state of rest or motion due to its mass
2. To overcome inertia of a body, a force has to be appiled.
  1. This force is dependent on the body's mass.
Weight
1. Defined as the gravitational force W acting on an object of mass m.
2. When a body falls, its gravitational force (weight) can produce an acceleration, g (the acceleration due to gravity).
3. Using Newton's second law of F = ma, W =mg
Density
1. Defined as its mass per unit volume
2. SI Unit: Kilogram per metre; kg/m3
3. For an object to float in a liquid, the object has to be less dense than the liquid.
4. If an object is denser than the liquid, the object will sink in the liquid.
Gravitational Field Strength
1. Defined as the gravitational force acting on a body per unit mass
Difference between Mass and Weight
1. Depends on location
  1. Weight: Yes
  2. Mass: No
2. Measured by using
  1. Weight: Spring balance
  2. Mass: Beam Balance
3. Unit
  1. Weight: Newton
  2. Mass: Kilogram

Resource summary

	Created by Lakshitha BV over 9 years ago