Properties
What are the two main properties of matter?
Mass and Volume
What is density?
Amount of matter in a certain volume.
Where is the air?
In the atmosphere
What are the four main types of aircrafts?
Hot air balloon
Airplane
Helicopter
Airship
What factors affect friction?
The weight of the objects and the types of surfaces.
What is mass?
Amount of matter in an object.
What is the density formula?
Density = mass/volume
What two gases do air mostly have?
Oxyen and nitrogen
What gases do airships use?
Hydrogen or helium
What is friction?
A force that works in the opposite direction to the direction of the object we are moving and slows it down.
What is volume?
Amount of space that an object occupies.
What measurement unit do we use to express density?
grams per cubic centimetre (g/cm3)
Why do living things need air?
Because they need oxygen to live
How does a hot air ballon work?
Balloon raises because hot air is less dense than cold air.
What did Egyptians use to move objects?
wooden rollers
What is matter?
Matter is everything around us that occupies space
why does an object float in water?
Because its density is lower than the density of water
Name the properties of air
How does an aeroplane work?
Plane rises up when air flows around the wings.
What motors don't use fossil fuels?
Electric motors
How do we measure the volume of a solid?
1. Read the volume of the liquid.
2. Add the solid and measure the new volume.
3. The volume is the difference between both volumes.
I need to know the density of an object whose mass is 1kg and the volume is 20 cL
1 kg = 1000g
20 cL= 200 mL 200 mL = 200 cm3
Density: 1000/200 = 5g/cm3
Name at least three reasons why air is important.
How does a helicopter work?
What did steam engines used for getting energy?
coal