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Read the Following Selection
Read about friction, or click on the play button below to listen aloud.
How Friction Helps Us
How does friction help us in daily life? Friction stops us from slipping.
There can be lots of ice on sidewalks in winter. Ice is very smooth, so ice is easy to slip and hurt yourself on. Why? A smooth surface rubbing against a smooth surface creates very little friction.
Winter boots help us from slipping on ice. Why?
A rough surface rubbing against a smooth surface creates medium friction. Winter boots have rough soles that create friction. Friction slows or stops movement. The rough soles on boots stop us from slipping on ice.
Sometimes people put sand on ice. Sand makes the ice surface rough. It is harder to slip on sandy ice.
The sand creates friction between the ice and your boots.
Slipping on stairs is very dangerous. You could hurt yourself badly if you fall down the stairs.
Stairs are often made of smooth wood. When shoes rub against smooth wood, there might not be enough friction.
The shoes might slip off the step. Socks are even worse.
Carpet can add friction to stairs. Rough strips of material work, too. The added friction stops people from slipping.
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1. Think about going down stairs wearing socks on your feet. Now think about going down stairs wearing athletic shoes.
Which example is more dangerous?CorrectIncorrect
2. In winter, some cars have snow tires. Snow tires help people drive in snow. Snow tires also help cars stop faster. In summer, cars have regular tires.
Which tires have a rougher surface?CorrectIncorrect
3. People do not leave snow tires on cars all year. When spring comes, people put regular tires back on.
Why do people not leave snow tires on all year? Use information from the text and your own ideas.
Great answer!Great answer!
Type your response above.
4. Fill in the blank using information from the text.
A rough surface rubbing against a smooth surface creates friction.
5. Why do winter boots stop us from slipping on ice?CorrectIncorrect