1. Mass
1.1. Definition: amount of matter in a body
1.2. Scalar quantity (only has magnitude)
1.3. SI unit: kilogram (kg)
1.3.1. Other forms of measurements:
1.3.1.1. gram (g)
1.3.1.2. pound (lb)
1.3.1.3. tonne (t)
1.4. Constant at any location
1.4.1. Amount of matter in your body is always constant, hence mass doesn't change
1.5. Instruments used:
1.5.1. Beam balance
1.5.2. Electronic balance
2. Weight
2.1. Definition: amount of gravitational force/gravity acting on a body
2.2. A type of force
2.3. Vector quantity as it has both magnitude and direction (downwards)
2.4. SI unit: Newton (N)
2.5. Varies at different locations
2.5.1. depends on the gravity acting on the body
2.5.1.1. eg. the weight of A on Earth (10 m/s^2) would be heavier than the weight of A on moon (1.6 m/s^2)
2.6. Instruments used:
2.6.1. spring balance
2.6.2. compression balance
3. Inertia
3.1. Definition: reluctance of an object to:
3.1.1. start moving (if it was stationary)
3.1.2. stop moving (if it was moving)
3.2. Dependent on mass
3.2.1. Greater mass leads to more inertia
3.3. Real life examples:
3.3.1. Seat belts: we can still stay in the same position when making a sharp turn/sudden brake as the seat belt increases our inertia
3.3.2. Ships taking a longer time to start and stop moving due to inertia
4. Gravitational field strength
4.1. Gravitational field: the region in which a mass experiences acceleration due to gravity
4.1.1. Stronger when it's nearer to the centre of the gravitational field and gets weaker as the body is further away
4.2. Definition: gravitation force acting per unit mass on an object
4.3. Earth's gravitation field strength is about 10N/kg
4.4. Congruent to acceleration due to gravity (m/s^2)
4.5. Unit: N/kg
5. Inter-relating mass and weight:
5.1. Weight = mass x acceleration due to gravity
5.1.1. Newton's 2nd Law of motion: Force = mass x acceleration
5.1.2. Weight is the force
5.1.3. acceleration due to gravity is the acceleration