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 =

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

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

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 ______________

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

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

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

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