Chapter 1

Question 1

What is the unit for speed?

Answer 1

m/s (mostly), km/h, m/h..

Question 2

State the suffixes and prefixes of numbers in physics.

Answer 2

Giga: A billion, or 10 to the power of 9.
Mega: A million, or 10 to the power of 6.
K: A thousand, 10 to the power of 3.

d : Deci, 10 to the power of -1.
c : Centi, 10 to the power of -2.
m : Milli, 10 to the power of -3. (1/1000)
micro = 10 to the power of -6.
nano = 10 to the power of -9.

Question 3

What is density?

Answer 3

The amount of mass per unit volume of a substance, measured in kg/m3.

Question 4

What is the word for the quantity of space an object occupies?

Answer 4

Volume, cubic metre.

Question 5

When does an object sink when thrown to the water?

Answer 5

When the object is denser than water.

Question 6

What is mass?

Answer 6

SI unit = Kg.
Mass is the TOTAL amount of matter in an object.

Question 7

How would you describe weight?

Answer 7

It’s a force, measured in Newtons, which shows how strong gravity pulls on down on the earth.

Question 8

Two meanings of g*

Answer 8

g ( gravitational field strength) = 10N/kg
g ( acceleration of free fall ) = 10m/s2