Unit 1 Topic 1: Basic physics

Question 1

What are SI units

Answer 1

Base units of physical quantities

Question 2

What are the base units?

Answer 2

Second (s) - time
Metre (m) - length
Kilograms (kg) - mass
Ampere (A) - current
Moles (mol) - amount
Kelvin (K) - temperature

Question 3

What is a scalar quantity?

Answer 3

A quantity that only has a magnitude

Question 4

What is a vector quantity

Answer 4

A quantity that has both magnitude and direction

Question 5

What are the conditions for a body to be at equilibrium?

Answer 5

The sum of the moment must = 0 and the sum of the forces acting must = 0.

Question 6

What are moments?

Answer 6

Moments are the turning effect of an object.

Question 7

What is the Centre of gravity?

Answer 7

The centre of gravity of an object is the point where we consider the whole weight of an object to act.

Question 8

What is the principle of moments?

Answer 8

For an object to be in equilibrium Total Clockwise moments must = Total anti-clockwise moments.