G2.6.5 Friction

Now rub your palms together.

First, gently….!

Then quickly…!

and then hard..!

What do you feel?

Have you ever thought why your palms become warm?

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

the action of one surface rubbing against another

• motion

• surface

• friction

movement

• surface

• motion

• friction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

the outer part

• motion

• friction

• surface

What is friction?

• Friction is a special force!

  When two surfaces are not in

  contact with each other

  creates a force called

  friction.

• Friction is a special force!

  When two surfaces are in

  contact with one another, it

  creates a force called

  friction

Check and explain…

Why do the soles of your shoes have treads?

• To reduce the friction between the surface

• To increase friction between the surface

Check and explain…

How can these treads help us from not falling or slipping?

• When you walk or run, your shoe tread catches on

  The ground helping you fall or slip

• When you’re walking or running, the tread of your shoes grip to the

  ground, which helps you from not falling or slipping

The force of friction on a smooth surface is _____________.

• Greater

• Lesser

Which type of surface produces more friction?

• Rough surface

• Smooth surface

How can we reduce friction?

-By using lubricants like powders or oils and grease.

-using rollers or wheels.

-by polishing