1.1 Basic Physics Flashcards
What is a Coulomb?
The unit used for charge, derived from the ampere and the second.
What is a Newton?
The unit for force, derived from the kilogram, metre, and second.
What is a Volt?
Joule per coulomb which is equivalent to kgm^2s^-3A^-1.
What does it mean to check equations for homogeneity?
When you find a new equation, you should check to make sure the type of quantity it returns matches with the quantities put into the equation.
What is the Pressure Equation?
P = F / A, where F is force in newtons, and A is area in metres squared.
What is a Scalar?
A quantity which has a magnitude.
What is a Vector?
A quantity with both a magnitude and a direction.
What are examples of Scalars?
Distance, Time, Speed, Density, Pressure, Mass, Temperature, Energy or work.
What are examples of Vectors?
Displacement, Velocity, Acceleration, Force, Magnetic field strength, Momentum.
What is Density (ρ)?
A measurement of how tightly matter is compacted together, defined by the equation ρ = mass / volume.
What is a Moment?
The turning effect of a force, determined by the distance from the pivot and the magnitude of the force applied.
What is the Principle of Moments?
The principle stating that the sum of the moments due to multiple forces at a point equals the moment caused by the resultant force.
How is Moment calculated?
The moment can be calculated using the equation, force x perpendicular distance from pivot.
What is Net Moment?
The total moment calculated by summing clockwise moments and subtracting anti-clockwise moments.
What is the Centre of Gravity?
The point on an object where the total weight can be considered to act.
What is Equilibrium?
A state where an object experiences no acceleration, meaning the resultant force and net moment are both zero.
