Friction
Grade 3 · Science · Forces and Motion · Alaska, USA
Lesson Summary
Friction is a force that slows things down when two surfaces rub against each other.
Explanation
When you slide a book across a table, it slows down and stops because of friction. Rough surfaces create more friction than smooth surfaces. That is why it is harder to slide on carpet than on ice. Friction can be helpful, like when it keeps your shoes from slipping on the floor. It can also be unhelpful, like when it slows down a bicycle wheel.
Practice Questions
Q1: Why does a ball rolling on grass slow down?
Answer: Because friction between the ball and the rough grass slows it down.
Q2: Which surface has more friction: ice or sandpaper?
Answer: Sandpaper, because it is much rougher than ice.
Q3: Give an example of when friction is helpful.
Answer: Friction on the soles of your shoes keeps you from slipping when you walk.
People Also Ask
What is Friction in Grade 3 Science?+
Friction is a lesson in the Forces and Motion chapter of Grade 3 Science. It is part of the Alaska, USA school curriculum and covers key concepts that students need to understand at this level.
What grade level covers Friction?+
Friction is taught in Grade 3 as part of the Science curriculum in Alaska, USA.
How can I help my child with Forces and Motion in Science?+
Start with the lesson summary and explanation on this page. Practice the questions provided, then use TutorTom for personalized, step-by-step help with Forces and Motion topics.