1. NEWTON’S 2ND LAW OF MOTION NOTES
UNBALANCED FORCES
What happens to an object when there are unbalanced forces acting upon it?
__________________________.
In what direction does the acceleration occur?
____________________________
_________________________.
west
east
Net force =

2. NEWTON’S SECOND LAW OF MOTION:
States that the _____________________________ acting on an object equals the object’s __________ times its _____________________________.
Force equals mass times acceleration.
Force (F) = mass (m) X acceleration (a)
F = ma or (m = F/a) or (a = F/m)
Force is measured in __________________ (____)
Mass is measured in __________________ (____)
Acceleration is measured in (____________)
1 N = 1 kg X 1 m/s2 F m a

3. FORCE/ACCELERATION RELATIONSHIP If __________________ stays constant…
As force ____________________________ then acceleration __________________________
________________________
Direct Relationship ( or )
 Same _________ 
Force ______________
Acceleration _____________
Force ______________
Acceleration _____________

4. Same ________________
FORCE/MASS RELATIONSHIP
If acceleration stays constant…
As mass increases then force increases
a = F/m
Direct Relationship ( or )
Mass _____________
Force ______________
Same ________________
Mass _____________
Force ______________

5. MASS/ACCELERATION RELATIONSHIP If force stays constant…
As mass decreases then acceleration increases
F = ma
Inverse Relationship ( or )
Same _______________
Mass ______________
Acceleration _______________
Mass ______________
Acceleration _____________

6. F = ma Problem #1
What is the force of a 25 kg ball accelerated at 9.8 m/s2 downward? F m a

7. F = ma Problem #2
A 63 kg skater pushes off from a wall with a force of 300 N. What is the skater’s acceleration traveling north? F m a

8. F = ma Problem #3
If a rock has an acceleration of 40 m/s2 and hits with a force of 285 N, what is its mass? F m a