Topic 2 - Textbook Extras Flashcards
What are the 5 Base Units? (There are 7 but 5 is the ones that are useful)
- Second / s - Metre / m - Kilogram / kg - Kelvin / K - Ampere / A
What are the Derived Units for Force?
kg m s*-2
What is the unit for Power in SI Base Units?
kg m*2 s*-3
What is the unit for Work (Energy) in SI Base Units?
kg m*2 s*-2
What is the unit for Electric Charge (Q) in SI Base Units?
A s
What is the unit for Potential Difference in SI Base Units?
kg m*2 A*-1 s*-3
What is the unit for Resistance in SI Base Units?
kg m*2 A*-2 s*-3
What is the Multiplier for the Prefix - Mega?
x10*6
What is the Multiplier for the Prefix - Kilo?
x10*3
What is the Multiplier for the Prefix - Milli?
x10*-3
What is the Multiplier for the Prefix - Micro?
x10*-6
What is the Multiplier for the Prefix - Nano?
x10*-9
What is the Multiplier for the Prefix - Pico?
x10*-12
What is a Vector?
Vectors have both magnitude and direction
What are Scalars?
Scalars have only magnitude but no direction
Examples of Vectors?
- Displacement - Velocity - Weight
Examples of Scalars?
- Distance - Speed - Mass
Formula for Vectors working along the same straight line?
Resultant = F1 + F2 Or F1 - F2
How do you find the magnitude and Direction to resolve 2 Vectors perpendicular to each other?
Use Pythagoras to calculate the magnitude A² = B² + C² To find the angle use Trigonometry Tan θ = Opposite / Adjacent
What should you consider when trying to resolve a Vector?
Split them into their different directions, POSITIVE and NEGATIVE
What happens if you are drawing out Vectors and you end up back where you started?
Happens when the resultant is zero, is the case for a system of forces acting on an object in equilibrium.
What is Mass?
Is the amount of matter you contain, kilograms (kg)
What is Weight?
Weight is the force of gravity pulling you down. Newtons (N)
What is the Weight Equation?
Weight = Mass X Gravity
Finish the sentence - Opposite Charges…
Attract
Finish the sentence - Like Charges…
Repel
When does a Normal Contact Force exist?
Exists wherever two solid surfaces are in contact.
What causes a Normal Contact Force?
- Due to electromagnetic forces acting between to atoms and molecules of two surfaces in contact.
Show a Free-Body Diagram of a man standing on the Earth?
How do you resolve these Vectors?
