9702 Physics

• The fundamental (base) units of physical quantities are listed in the SI system.
• The SI unit of mass is Kilogram, kg.
• The SI unit of current is Amperes, A.
• The SI unit for temperature is K (kelvin) as this is the absolute scale.
• The SI unit of length is Metre, m.
• Time is the quantity measured in seconds.
• Newtons (N) are not an SI unit.
• The SI units for force are kg m s -2 (since F = ma).
• A quantity that has only magnitude is referred to as a scalar quantity.
• Acceleration is a vector quantity.
• One mole of a given substance is defined as the amount with a number of particles equal to the Avogadro Constant N_A.
• A quantity that has a magnitude as well as a direction is referred to as a vector quantity.
• Mass is a scalar quantity.
• To calculate the magnitude of a force F that is 30º to the horizontal and has a horizontal component of 7.0N, use the formula F = √(Fx² + Fy²).
• The SI units of energy can be derived.
• Avogadro’s constant is a measure of the number of atoms in 0.012kg of carbon-12.
• Force is equal to mass x acceleration in SI units, symbolized as kg x m s^-2.
• The SI units of force are expressed as kg x m s^-2.
• The multiplier associated with the prefix kilo (k) is x1000 (10^3).
• 8MΩ can be expressed as 8,000,000Ω or 8 x 10^6 Ω.
• 7GΩ can be expressed as 7 x 10^9 Ω.
• Kinetic energy is equal to ½ x mass x velocity in SI units, symbolized as kg x (m/s)².
• 60TΩ can be expressed in standard form as 6 x 10^13 (T is tera and the multiplier is 10^12).
• 0.000003m can be written with a suitable prefix, in this case µm (3 x 10^-6 m).
• 6000pF can be expressed in nF as 6nF (since 1 nF = 1000 pF).