Key Idea.
Section 1
Forces Act as Pushes or Pulls
A force is a special kind of action that is always a "push or a pull". When a soccer ball is kicked, a push makes it move. When a wagon is tugged along the ground, a pull makes it move.
Forces are not something an object has on its own. A force always happens between at least two objects. For a toy block to slide across a table, a hand must push it. The force is the interaction between the hand and the block.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter
Expand to review the lesson summary and core properties.
Section 1
Forces Act as Pushes or Pulls
A force is a special kind of action that is always a "push or a pull". When a soccer ball is kicked, a push makes it move. When a wagon is tugged along the ground, a pull makes it move.
Forces are not something an object has on its own. A force always happens between at least two objects. For a toy block to slide across a table, a hand must push it. The force is the interaction between the hand and the block.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter