Mass, Weight and Density

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Mass, Weight and Density by Mind Map: Mass, Weight and Density

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: gram (g) pound (lb) 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 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