BASIC PHYSICS

Question 1

What are the 6 fundamental SI base units?

Answer 1

kg m s K A mol

Question 2

What is N in base SI units?

Answer 2

kgms⁻²

Question 3

What is J in base SI units?

Answer 3

kgm²s⁻²

Question 4

What is V in base SI units?

Answer 4

kgm²A⁻¹s⁻³

Question 5

What does it mean if an equation is homogenous?

Answer 5

Both sides have identical base SI units

Question 6

What is a scalar?

Answer 6

A scalar is a quantity that has a magnitude only

Question 7

What is a vector?

Answer 7

A vector is a quantity that has a magnitude and direction

Question 8

What is displacement?

Answer 8

Vector equivalent of distance, shortest path A to B

Question 9

What is the difference between speed and velocity?

Answer 9

Velocity is speed in a particular direction (vector)

Question 10

How can you find the resultant of two vectors that are perpendicular?

Answer 10

Pythagoras

Question 11

What is a moment?

Answer 11

Force x perpendicular distance from the pivot

Question 12

What can be described as the turning effect of a force?

Answer 12

Moment

Question 13

What is the principle of moments?

Answer 13

For a system to be in equilibrium the resultant moment equals zero

Question 14

What 2 conditions are needed for equilibrium?

Answer 14

Resultant force = zero and Resultant moment = zero

Question 15

What is the centre of gravity?

Answer 15

Single point at which entire weight of the body is considered to act

Question 16

What is density?

Answer 16

density = mass/volume

Question 17

What units can density be measured in?

Answer 17

kgm⁻³ or gcm⁻³

Question 18

Which state has the highest density in general?

Answer 18

Solids