Strengthen (Year 9 EOY Assessment)

Question 1

What is the mass of a neutron?

Answer 1

1/1835 or Negligible

Question 2

Who first discovered the atom?

Answer 2

John Dalton or Demokritos

Question 3

What was JJ Thompson responsible for?

Answer 3

The plum pudding model.

• atoms are positive “dough”
• electrons are stuck in this positive “dough”

Question 4

What is the latest modification of the atomic model?

Answer 4

The James Chadwick Model

• nucleus of protons and electrons in the centre
• electron shells to contain the electrons far outside the nucleus

Question 5

What is acceleration? And how is it calculated?

Answer 5

A change in Velocity.

Formula 1: (v-u) ÷ t
Formula 2: v² - u² = 2a(s or x
s or x = distance)

Question 6

What is velocity? And what is the formula for it?

Answer 6

The speed of an object of over a select given time (usually 1s) in a specific direction.

change in displacement / change in time

Question 7

What is Terminal Velocity?

Answer 7

The constant speed of an object achieved by falling FREELY through a liquid or gas

Question 8

What is the formula for magnification?

Answer 8

image size / actual size = magnification

Question 9

What is the formula for TOTAL magnification?

Answer 9

eyepiece lens x objective lens

Question 10

Name the units of measurement with their symbols for size from biggest to smallest.

Answer 10

metre (m) — millimetre (mm) — micrometre (μm)— nanometre (nm) — picometre (pm)