Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to find normal force [title] Understand what normal force refers to. [step] Normal force refers to the amount of force use to counteract the force of gravity. [substeps] Imagine a block sitting on a table.

Ending1: The force of gravity travels across the table at 180 degrees and moves across the table toward the block. When it moves on either side, the force of gravity travels across the table where the block sits. Ending2: This is usually a block, not a table, so it can be a somewhat isolated object that has significant resistance, like paper. You can determine how much force you can apply to your attacker by looking at this block. Ending3: The force of gravity pulls the block toward the earth, but clearly, there is some force at work preventing the block from crashing through the table and finishing its descent toward the ground. The force responsible for stopping the block in spite of gravitational force is the normal force. Ending4: If you put one of your hands on the table and push up to it, then the chair does not come upright. The opposite arm changes weight to offset the force pulling your hand up.

Answer format: ending1/ending2/ending3/ending4