1. Inertia
1.1. Definition: reluctance of an object to:
1.1.1. start moving (if it was stationary)
1.1.2. stop moving (if it was moving)
1.2. Dependent on mass
1.2.1. Greater mass leads to more inertia
1.3. Real life examples:
1.3.1. Seat belts: we can still stay in the same position when making a sharp turn/sudden brake as the seat belt increases our inertia
1.3.2. Ships taking a longer time to start and stop moving due to inertia
2. Gravitational field strength
2.1. Gravitational field: the region in which a mass experiences acceleration due to gravity
2.1.1. Stronger when it's nearer to the centre of the gravitational field and gets weaker as the body is further away
2.2. Definition: gravitation force acting per unit mass on an object
2.3. Earth's gravitation field strength is about 10N/kg
2.4. Congruent to acceleration due to gravity (m/s^2)
2.5. Unit: N/kg
3. Mass
3.1. Definition: amount of matter in a body
3.2. Scalar quantity (only has magnitude)
3.3. SI unit: kilogram (kg)
3.3.1. Other forms of measurements:
3.3.1.1. gram (g)
3.3.1.2. pound (lb)
3.3.1.3. tonne (t)
3.4. Constant at any location
3.4.1. Amount of matter in your body is always constant, hence mass doesn't change
3.5. Instruments used:
3.5.1. Beam balance
3.5.2. Electronic balance
4. Weight
4.1. Definition: amount of gravitational force/gravity acting on a body
4.2. A type of force
4.3. Vector quantity as it has both magnitude and direction (downwards)
4.4. SI unit: Newton (N)
4.5. Varies at different locations
4.5.1. depends on the gravity acting on the body
4.5.1.1. 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)
4.6. Instruments used:
4.6.1. spring balance
4.6.2. compression balance
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