## Reflection: Developing a Conceptual Understanding Newton's 2nd Law: Paper Clip Racers - Newton's Law Expo (7 of 9) - Section 3: Student Activity

The best strategy for teaching Newton's 2nd Law, that I have found, is to focus on the relationship between force(F), mass(M), and acceleration(a); which can be expressed as the formula F=ma or force(F) equals mass(m) times acceleration(a). In other words the force placed on an object is based on the objects mass and at what rate of speed it is traveling.

In a prior lesson Newton's 2nd Law Demonstration the students build a variable strip that allows them to manipulate the three variables contained within Newton's 2nd Law.

To build, cut three holes (about the size of a quarter) at each end and in the middle of a sentence strip. Label each hole as mass, force, and acceleration (in that order). A student can then insert their finger into the hole representing the variable they wish to remain constant. By placing their finger in the other hole they can raise or lower that value and the third variable reacts accordingly (either high or lower). So if force remains constant, an increase in acceleration requires a decrease in mass. In Newton's 2nd Law Demonstration each student must present their variable strip to their elbow partner and explain how the three variables interact.

Best technique for teaching Newton's 2nd Law
Developing a Conceptual Understanding: Best technique for teaching Newton's 2nd Law

# Newton's 2nd Law: Paper Clip Racers - Newton's Law Expo (7 of 9)

Unit 6: Forces
Lesson 7 of 12

## Big Idea: Racing paper clips will show that greater force produces greater acceleration.

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63 minutes

### Sean Gillette

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