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Sliding and Rolling
Emma is playing hockey. She shoots the puck. The puck moves across the ice. How is the puck moving? The puck is sliding.
An object slides when it moves across a surface and is always touching the surface. A puck moves across the ice. The ice is a surface. The puck is always touching the ice as it moves.
Kenji is playing with marbles. He shoots a marble across the floor. The floor is a surface. The marble moves across a surface. The marble is always touching the surface of the floor. Is the marble sliding?
The marble is not sliding. The marble is rolling. An object rolls when it turns around and around as it moves across a surface. An object that is sliding does not turn around and around as it moves.
Comparing Rolling and Sliding
A sliding object moves across a surface. A rolling object also moves across a surface.
A sliding object is always touching a surface. A rolling object is also always touching a surface.
A sliding object does not turn around and around as it moves. A rolling object turns around and around as it moves.
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1. Match the sentences to show two ways that sliding and rolling are the same.
across a surface.
touching a surface.
Sliding and rolling objects both move…
Sliding and rolling objects are both always…
2. A rolling object does something that a sliding object does not do. What is it?CorrectIncorrect
3. Emma is riding her bike on her driveway. Are the wheels on the bike sliding or rolling?CorrectIncorrect
4. What surface do the wheels on Emma’s bike move across?CorrectIncorrect
5. You can make a puck roll if you turn it on its side and push. Is this true or false?CorrectIncorrect