Physical Quantities Part 2

Question 1

Define scalar

Answer 1

Physical quantities defined by magnitude only, eg. Length, Time, Mass, Speed, Energy, Power

Question 2

Define vector

Answer 2

Physical quantities defined by magnitude and direction, eg. Displacement, Acceleration, Momentum, Moment, Force, Weight, Velocity, Gravitational Field Strength, Electric Field Strength

Question 3

Describe vector diagrams

Answer 3

Shown using an arrow
Length of arrow - magnitude
Direction of arrow - direction

Question 4

Define resultant of 2 vectors

Answer 4

Resultant is the sum or combined effect of 2 vector quantities, same as net vector

Question 5

Define the parallelogram law

Answer 5

When 2 vectors are joined tail to tail, complete the parallelogram
Resultant found by drawing the diagonal

Question 6

Define the triangle law

Answer 6

When 2 vectors are joined head to tail, draw the resultant vector by completing the triangle

Question 7

Describe the components of a vector

Answer 7

V sin x - the vertical component of V
V cos x - the horizontal component of V

V sin x and V cos x are at 90 degrees to each other