Friction is a force that occurs when two surfaces move against each other or try to move. The amount of friction depends on how rough the surfaces are and the force pushing them together. There are different types of friction including static, sliding, rolling, and fluid friction. Friction can be both helpful and harmful - it allows us to walk and write but also reduces efficiency and speed.

1. Friction

2. Friction – is a force that is produced
when two uneven surfaces move against
each other.
- it can hinder the movement of
an object or prevent it from moving at all

3. • The force of friction depends on how
uneven the two surfaces are.
- Dry and rough surfaces produce
greater amounts of friction than
smooth and wet surfaces.

4. • The force of friction depends on the
force that pushes two surfaces against
each other.

5. Types of Friction
Static Friction
- occurs in objects that are resting against
each other.
Example:

6. Sliding Friction
- occurs when two surfaces slide against
each other.
- a lesser type of friction since it keeps the
surface of one object from sliding too fast
against the surface of another object.
Example:

7. Rolling Friction
- is produced when a surface rolls over
another surface.
- considered a weaker type of friction
because there is hardly any friction
between the two surfaces.
Example:

8. Fluid Friction
- also known as air resistance or drag
- is produced when an object moves through
fluids such as water and air.
- the amount of resistance produced by the
fluid depends on the shape, material, and
speed of object as well as the viscosity of
the fluid.
Example:

9. Effects of Friction
» Friction makes heavy objects to move
» Friction reduces efficiency in machines
» Friction can reduce the speed of
vehicles

10. How Friction can be Useful
☼Friction helps you write and draw.
☼Friction make it easy for you to walk or
run