1. What to do… Open your note packet to page 32
Answer the following in your “Think About It”
How do you think mass will affect an objects acceleration? Use your own words.

2. Newton’s Second Law Chapter 20, Section 2
SPI: Identify and explain how Newton’s laws of motion relate to the movement of objects.

4. Newton’s 2nd Law of Motion
The acceleration of an object is equal to the net force exerted on the object divided by the object’s mass.
Force =
Acceleration =
The acceleration due to gravity on earth =
Mass x Acceleration
Force
Mass
9.8 m/s2

5. Three Forms of Newton’s 2nd Law
If you want to find…
And you know…
Then the formula you would use is…
Acceleration (a)
Net Force (F)
Mass (m)
Net Force (F) and mass (m)
Acceleration (a) and mass (m)
Net Force (F) and acceleration (a)

6. Units for solving for Newton’s 2nd Law
Identify the information you are given
Look at the units
Unit for Force – Newton (N)
Remember: Weight is a force due to gravity
If the problem asks you to solve for weight you need to identify the acceleration due to gravity for you given location
Unit for Acceleration – m/s2
Unit for Mass – kg or g

7. Units for solving for Newton’s 2nd Law
Remember: Weight is a force due to gravity
If the problem asks you to solve for weight you need to identify the acceleration due to gravity for you given location
Unit for Acceleration – m/s2
Unit for Mass – kg or g

9. An object at REST Balanced Force
The force exerted by the is to
Unbalanced Force The force exerted by gravity is than air resistance.
HAND
EQUAL
GREATER
THE FORCE OF GRAVITY

10. An object in MOTION Increase Speed Decrease Speed Change Direction
Unbalanced forces cause objects to Accelerate
Increase Speed
Decrease Speed
Change Direction

11. Part I: Acceleration Depends on Mass
Acceleration as its mass
decreases
increases
Acceleration as mass
increases
decreases
Acceleration and mass are
inversely related
Example: You are pushing a shopping cart at the grocery store. At the beginning of your shopping trip, you exert a small force on the cart to accelerate it. (smaller mass = greater acceleration)
Exert the same amount of force when the cart is full and the cart will not accelerate as much. (greater mass = smaller acceleration)

12. Part II: Acceleration Depends on Force
Acceleration as the force on it
increases
increases
Acceleration as the force on it
decreases
decreases
Acceleration and force are
directly related
Example: When pushing the full shopping cart, if you push harder (greater force), the cart will move faster.
If you push the full shopping cart with less force, the cart will move slower.
**The acceleration is always in the as the force applied. The shopping cart moved forward because the push was in a forward direction
same direction

13. We know that objects with different masses accelerate to the ground
However, because of the 2nd Law we know that they don’t hit the ground with the same
at the same rate.
force.
F = ma
9.8 N = 1 kg x 9.8 m/s/s
F = ma
98 N = 10 kg x 9.8 m/s/s

14. DO!! Examine this picture:
Explain the Second Law of Motion using this picture as an example.
Be sure to identify all forces.
The acceleration of the table depends on how heavy or light it is AND how much force the man is putting on it

15. Keys to Understanding At LEAST 5 complete sentences
Summarize the main points of the lesson
Describe in detail the important ideas
Write about concepts you want to remember
This should be helpful to YOU!