# 2.3 Scalars and Vectors Flashcards

What is a scalar quantity?

A physical quantity with magnitude but no direction

What is a vector quantity?

A physical quantity with both magnitude and a specified direction

Scalar quantities and their vector equivalents (4)

Time = Force

Mass = Acceleration

Speed = Velocity

•Distance = Displacement

How are vector quantities represented?

A line (representing magnitude to scale) with a single arrowhead (representing the direction)

How are vectors added and subtracted?

Take one direction to be positive and add or subtract as normal

How can a resultant vector be broken up into its constituent parts? (2)

All vectors have a horizontal and vertical component

By knowing the magnitude and angle of a vector, trigonometry can be used to calculate the sides of a right angled triangle made of the two components

What is true about the forces on a stationary object?

They are in equilibrium meaning both the horizontal and vertical components balance out

How are vectors subtracted?

Reverse the direction of the subtracted vector and add

To subtract Y from X:

Reverse the direction of Y and add this vector to X