science term 2

Question 1

what is newtons first law

Answer 1

An object’s motion will not change unless a force acts upon it. This is also known as the law of inertia.

Question 1

what is newtons second law

Answer 1

F = ma
The acceleration of a moving object depends upon its mass and the force acting on it”.

Question 2

what is newtons third law

Answer 2

For every action there is an equal and opposite reaction

Question 3

distance meaning

Answer 3

Distance is a measure of how far apart objects are.

Question 4

displacement meaning

Answer 4

Displacement is the direct length between any two points when measured along the minimum path between them

Question 5

how to calculate displacement and distance

Answer 5

To calculate distance, the direction is not considered. To calculate displacement, the direction is taken into consideration.

Question 6

speed features

Answer 6

• scalar quantity
  -magnitude but no direction
  -use distance to calculate speed

Question 7

velocity features

Answer 7

• vector quantity
• magnitude and direction
  -we use displacement to calculate velocity

Question 8

graph shows

Answer 8

straight line- constant velocity
go up- acceleration
go down- negative acceleration
bottom straight- stationary

Question 9

what is acceleration

Answer 9

acceleration is a change in an object’s velocity over time

Question 10

what is velocity

Answer 10

velocity is the speed acting on a certain direction

Question 11

atoms

Answer 11

Atoms are the particles that make up all the substances in the universe.

Question 12

Nucleus

Answer 12

The centre of each atom is its nucleus. It is a tight, dense, bundle of protons and neutrons.

Question 13

Protons

Answer 13

Protons carry a positive charge (+)

Question 14

neutrons

Answer 14

Neutrons have a neutral charge and no charge

Question 15

electrons

Answer 15

electrons are negatively charged they attract to the positive nucleus.

Question 16

Elements

Answer 16

Because electrons are negatively charged they attract to the positive nucleus.

Question 17

electron shell

Answer 17

2/8/8/16/32

Question 18

atom

Answer 18

the number of Protons and Electrons are equal in a neutral atom

Question 19

mass number

Answer 19

number of protons + number of neutrons

Question 20

Group 1 metals

Answer 20

alkali metals and they are very reactive, conduct heat and electricity.

Question 21

group 2 metals

Answer 21

alkaline metals they are not as reactive as alkali metals

Question 22

group 4-12

Answer 22

are known as the transition metals. Much denser, stronger and harder than group 1 elements, however they are less reactive than the metals in group 1.

Question 23

Group 18

Answer 23

is known as the noble gases. Also known as the inert gases because they are unreactive

Question 24

ions

Answer 24

An ion is like an electrically charged building block of matter. It’s formed when an atom gains or loses electrons, giving it a positive or negative charge. Imagine it as a tiny electrically charged particle.

Question 25

cation

Answer 25

A cation is an ionic species with a positive charge.

Question 26

anion

Answer 26

negatively charged ion,