12.1 Forces
12.2 Newton's First and second Laws of Motion
12.3 Newton's Third Law of Motion and Momentum
12.4 Universal Forces
What starts an Object Moving?
Procedure
On a flat surface, arrange four pennies in a row so that they are touching one another.
Using your index finger, slide a fifth penny across the surface in line with the row of pennies so that it strikes a penny at one end of the row.
Think About it
Observing Describe how the row of pennies moves in response to the collision.
Formulating Hypotheses What do you think caused the pennies to move after the collision? Why didn…t the pennies move before the collision?