AS Physics Unit 1.2 Scalars And Vectors Flashcards
What is the definition of a vector?
A vector is a physical quantity that needs magnitude and direction.
What is the definition of a scalar?
A scalar is a physical quantity that requires only magnitude.
Give some examples of vectors?
Displacement, Velocity, Acceleration, Force, Electric Current, Momentum.
Give some examples of scalars?
Distance, Speed, Rate of Change of Speed, Time, Electric Charge, Kinetic Energy, Temperature, Aread
, Volume, Mass.
What is it called when we add 2 or more vectors?
The resultant force.
What happens when force arrows point in the same way?
We add them.
What happens when force arrows point in opposite directions?
We subtract.
What method do we use if the vectors are not in a straight line?
The nose to tail method.
What theorem is used to calculate force in a triangle?
Use Pythagoras Theorem.
What is the definition of equilibrium?
An object is in equilibrium if the up forces equal the down forces and the forces acting to the left equal those acting to the right. E.g. Translational.
What should you do if you already have the resultant force but want the vertical and horizontal component?
You would resolve using the resultant force and the angle.
