Activity

# Introducing Friction

## A hands-on activity to introduce students who are blind and visually impaired to friction.

A hands-on activity to introduce students who are blind and visually impaired to friction.

### Materials

• wooden spools
• 18 inch wooden board
• ruler
• various small objects made from a variety of materials (rubber, wood, plastic, metal, etc.)

### Procedure

#### Part I:  Review Force and introduce Friction

1. Force is a push or a pull.
• Demonstrate and ask students to imitate pushing their hands together.
• Demonstrate and ask students to imitate pulling their hands apart.
• Friction is a force caused when two objects push or rub against each other.
2. Friction is the force that slows thing down.
• Demonstrate and ask students to rub their hands together.
• Ask “What do you notice?”  Their hands get warmer.
• Friction always gives off some heat.
3. Explore friction with wooden spools and sand
• Push and pull a spool through sand, standing up and on its side.
• The sand makes it harder to move the spool because it rubs against the spool and creates “friction.”

#### Part II  Measuring friction:

1. Spool on a ramp standing up
• Place the spool, standing up at the end of an 18 inch wooden board.
• Slowly lift the board until the spool moves.
• Observe and/or measure the height of the board when the spool moved.
2. Spool on a ramp on its side
• Place the spool, on its side at the end of an 18 inch wooden board.
• Slowly lift the board until the spool moves.
• Observe and/or measure the height of the board when the spool moved.
3. Objects on a ramp
• Place each object one at a time on the end of the board and slowly lift the board.
• Observe and/or measure the height of the board when the object moves.

### Variations

Use a larger board.

### NGSS Standards

K-PS2-2 Motion and Stability: Forces and Interactions

• Analyze data to determine if a design solution works as intended to change the speed or direction of an object with a push or a pull.

By Selma Walsh