1. Newton’s first law REVIEW
Summarize what the law states. What does an object at rest need for it to move? What is another name for newton’s first law of motion? What is inertia? What causes a moving object to stop moving? The (more/less) mass an object has, the harder it is to move.

2. Newton’s Second Law

3. NEWTON’S second law
The acceleration of an object depends on the mass of the object and the amount of force applied. VOLUNTEERS!!!!! TWO “pushers” of similar size ONE small 8th grader ONE big 8th grader
Have the “small” and “big” student sit in a chair. Have the “pushers” push them across the room. Discuss which required more energy and why.

4. Part 1: Acceleration depends on mass
Acceleration of an object decreases as its mass increases Acceleration of an object increases as its mass decreases
Which would be easier to push?
WHY?

5. Part 2: Acceleration depends on force
Acceleration of an object increases as the force on it increases Acceleration of an object decreases as the force on it decreases
VOLUNTEERS!!!!!
ONE to sit in chair
ONE to push chair

6. Newton’s law with MATH mass Force acceleration Formula: F = m a
Have students guess what the variables represent
UNITS 
acceleration: m/s² (meters per second squared)
force: N (Newtons)
mass: kg (kilograms)

7. If you want to find Force
Force = Mass X Acceleration
(F= M X A),
Unit is the Newton (N),
Force F ÷ ÷ A M X
Acceleration
Mass
Mass = Force ÷ Acceleration, (M = F ÷ A)
Measured in kilograms (kg)
Acceleration = Force ÷ Mass, Measured in meters per second squared (m/s²)
Copyright © 2010 Ryan P. Murphy

8. Let’s Practice
Complete guided practice worksheet with me, then tape in your journal.

9. Newton’s Laws video clip