Show:
Properties
Density
Air
Aircrafts
Moving objects on land
100

What are the two main properties of matter?

Mass and Volume

100

What is density?


Amount of matter in a certain volume.

100

Where is the air?

In the atmosphere

100

What are the four main types of aircrafts?

Hot air balloon

Airplane

Helicopter

Airship

100

What factors affect friction?

The weight of the objects and the types of surfaces.

200

What is mass?

Amount of matter in an object.

200

What is the density formula?

Density = mass/volume

200

What two gases do air mostly have?

Oxyen and nitrogen


200

What gases do airships use?

Hydrogen or helium

200

What is friction?

A force that works in the opposite direction to the direction of the object we are moving and slows it down.

300

What is volume?

Amount of space that an object occupies.

300

What measurement unit do we use to express density?

grams per cubic centimetre (g/cm3)

300

Why do living things need air?

Because they need oxygen to live

300

How does a hot air ballon work?

Balloon raises because hot air is less dense than cold air.

300

What did Egyptians use to move objects?

wooden rollers

400

What is matter?

Matter is everything around us that occupies space

400

why does an object float in water?

Because its density is lower than the density of water


400

Name the properties of air

  • Colourless, odourless. No specific shape.
  • Changes volume according to temperature.
  • It has mass and volume.
  • It can move.
400

How does an aeroplane work?

Plane rises up when air flows around the wings.

400

What motors don't use fossil fuels?

Electric motors

500

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.

500

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

500

Name at least three reasons why air is important.

  • Living things need oxygen to breathe.
    • Plants need it for photosynthesis.
  • Oxygen is necessary for combustion.
  • It is possible to fly.
  • Weather phenomena happens there.
  • Sound travels through the air.
  • Source of energy.
500

How does a helicopter work?

  • Engines and thin blades that rotate like wings.
  • Helicopter rises up when air flows around the blades.
500

What did steam engines used for getting energy?

coal