2. OBJECTIVES
• By the end of the lesson, learners should be able to
• understand that all substances have physical properties.
• materials are grouped base on these properties.
SUCCESS CRITERIA
• The physical properties of materials can helps us to select
materials from the world around us for our survival.
3.
4. THE PHYSICAL PROPERTIES OF MATERIALS
Properties Meaning
Surface
appearance
Shiny, dull, rough or smooth
Rigid Cannot be bent or squashed
Flexibility Can be bent or squashed but springs back
to original shape when force is removed
Hard or soft Hard surface due to being rigid
Soft surface due to being flexibility
5. THE PHYSICAL PROPERTIES OF MATERIALS
Properties Meaning
malleable Shaped by hammering or pressing without
cracking
Brittle Breaks suddenly if bent or hit
Absorbent Has holes through which water can pass
and space to collect water.
Waterproof Does not allow water to pass through
Water-resistant material is made of fibers.
Water-repellent does not have any holes
6. THE PHYSICAL PROPERTIES OF MATERIALS
Properties Meaning
Transparent Light pass through without the light rays
being scattered
Translucent Light pass through but the light rays are
scattered
Opaque Do not allow light to pass through them
7. THE PHYSICAL PROPERTIES OF MATERIALS
Properties Meaning
Heat conductor Allows heat to pass through it
Heat insulator Does not let heat pass through it
Electrical
conductor
Allows an electric current to flow through
it
Electrical
insulator
Does not allow an electric current to flow
through it
8. PROPERTY PROFILE
• A description of a material in terms of its properties is
called it properties profile. Property profile can be made
by testing each material of the physical properties learnt.
• When testing for flexibility it is important to consider the
shape of the material. A solid can be tested to find out if it
conduct electricity using a circuit.
