1.1 Basic Physics

Question 1

What are the 6 basic SI units:

Answer 1

kg, m, s, A, mol, K

Question 2

When is an equation Homogenous

Answer 2

When both sides have identical base SI units

Question 3

Scalar

Answer 3

A scalar is a quantity that has magnitude only

Question 4

Vector

Answer 4

A vector quantity has magnitude and direction

Question 5

Give two examples of a Scalar:

Answer 5

Possible answers:
mass, distance, volume, density, time, speed, pressure

Question 6

Give two examples of a Vector:

Answer 6

Possible answers:
Displacement, velocity, acceleration, momentum, force, current

Question 7

When adding two vectors that are on the same plane we:

Answer 7

Add them together to find the resultant force

Question 8

When adding two vectors that are perpendicular to each other we:

Answer 8

Use trigonometry to find the resultant force (Hypotenuse)

Question 9

Density

Answer 9

Mass per unit volume

Question 10

Moment

Answer 10

Is the product of force and the perpendicular distance between the line of action of the force and the pivot

Question 11

Do moments have to be clockwise

Answer 11

No

Question 12

How to find the centre of gravity in a rectangle

Answer 12

Draw two lines from diagonally opposite corners and the place where they cross over is the centre of gravity

Question 13

What are the conditions for equilibrium

Answer 13

1. The resultant force (in any given line) is zero
2. The net moment (about any given point) is zero

Question 14

Principle of moments

Answer 14

The net moment (about any given point) is zero